Data Sheet, Rev. 3

May 2004

FW802B Low-Power PHY IEEE

1394A-2000

Two-Cable Transceiver/Arbiter Device

Distinguishing Features

Compliant with IEEE Standard 1394a-2000, IEEE
Standard for a High Performance Serial Bus
Amendment 1.

Low-power consumption during powerdown or
microlow-power sleep mode.

Supports extended BIAS_HANDSHAKE time for
enhanced interoperability with camcorders.

While unpowered and connected to the bus, the
device will not drive TPBIAS on a connected port
even if receiving incoming bias voltage on that port.

Does not require external filter capacitors for PLL.

Does not require a separate 5 V supply for 5 V link
controller interoperability.

Interoperable across 1394

cable with 1394 physi-

cal layers (PHY) using 5 V supplies.

Interoperable with 1394 link-layer controllers using
5 V supplies.

1394a-2000 compliant common-mode noise filter
on incoming TPBIAS.

Powerdown features to conserve energy in battery-
powered applications include:
-- Device powerdown pin.
-- Link interface disable using LPS.
-- Inactive ports power down.
-- Automatic microlow-power sleep mode during

suspend.

Interface to link-layer controller supports Annex J
electrical isolation as well as bus-keeper isolation.

Features

Provides two fully compliant cable ports at
100 Mbits/s, 200 Mbits/s, and 400 Mbits/s.

Fully supports 1394 Open HCI requirements.

Supports arbitrated short bus reset to improve
utilization of the bus.

Supports ack-accelerated arbitration and fly-by con-
catenation.

Supports connection debounce.

Supports multispeed packet concatenation.

Supports PHY pinging and remote PHY access
packets.

Fully supports suspend/resume.

Supports PHY-link interface initialization and reset.

Supports 1394a-2000 register set.

Supports LPS/link-on as a part of PHY-link inter-
face.

Supports provisions of IEEE 1394-1995 Standard
for a High Performance Serial Bus.

Fully interoperable with FireWire

implementation

of IEEE 1394-1995.

Reports cable power fail interrupt when voltage at
CPS pin falls below 7.5 V.

Provides separate cable bias and driver termination
voltage supply for each port.

Other Features

64-pin TQFP package. (Lead-free package also
available. See ordering information on page 25.)

Single 3.3 V supply operation.

Data interface to link-layer controller provided
through 2/4/8 parallel lines at 50 Mbits/s.

25 MHz crystal oscillator and PLL provide a
50 MHz link-layer controller clock as well as trans-
mit/receive data at 100 Mbits/s, 200 Mbits/s, and
400 Mbits/s.

Node power-class information signaling for system
power management.

Multiple separate package signals provided for ana-
log and digital supplies and grounds.

Description

The Agere Systems Inc. FW802B device provides
the analog physical layer functions needed to imple-
ment a two-port node in a cable-based IEEE 1394-
1995 and IEEE 1394a-2000 network.

Each cable port incorporates two differential line
transceivers. The transceivers include circuitry to
monitor the line conditions as needed for determin-
ing connection status, for initialization and arbitration,
and for packet reception and transmission. The PHY
is designed to interface with a link-layer controller
(LLC).

Agere Systems Inc.

Data Sheet, Rev. 3

May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

Table of Contents

Contents

Page

Distinguishing Features ...............................................................................................................................................1
Features ......................................................................................................................................................................1
Other Features ............................................................................................................................................................1
Description ..................................................................................................................................................................1
Signal Information .......................................................................................................................................................6
Application Information ..............................................................................................................................................11
Crystal Selection Considerations ..............................................................................................................................12

Load Capacitance .............................................................................................................................................. 13
Adjustment to Crystal Loading ........................................................................................................................... 13
Crystal/Board Layout ..........................................................................................................................................13

1394 Application Support Contact Information ..........................................................................................................13
Absolute Maximum Ratings .......................................................................................................................................14
Electrical Characteristics ...........................................................................................................................................15
Timing Characteristics ...............................................................................................................................................18
Timing Waveforms ....................................................................................................................................................19
Internal Register Configuration ..................................................................................................................................20
Outline Diagrams .......................................................................................................................................................25

64-Pin TQFP ...................................................................................................................................................... 25

Ordering Information .................................................................................................................................................25

List of Figures

Figures

Page

Figure 1. Block Diagram .............................................................................................................................................. 5
Figure 2. Pin Assignments .......................................................................................................................................... 6
Figure 3. Typical External Component Connections ................................................................................................. 11
Figure 4. Typical Port Termination Network .............................................................................................................. 12
Figure 5. Crystal Circuitry ..........................................................................................................................................13
Figure 6. Dn, CTLn, and LREQ Input Setup and Hold Times Waveforms ................................................................ 19
Figure 7. Dn, CTLn Output Delay Relative to SYSCLK Waveforms ......................................................................... 19

List of Tables

Tables

Page

Tables 1. Signal Descriptions ...................................................................................................................................... 7
Tables 2. Absolute Maximum Ratings ....................................................................................................................... 14
Tables 3. Analog Characteristics ............................................................................................................................... 15
Tables 4. Driver Characteristics ................................................................................................................................ 16
Tables 5. Device Characteristics ............................................................................................................................... 17
Tables 6. Switching Characteristics .......................................................................................................................... 18
Tables 7. Clock Characteristics ................................................................................................................................ 18
Tables 8. PHY Register Map for the Cable Environment ......................................................................................... 20
Tables 9. PHY Register Fields for the Cable Environment ....................................................................................... 20
Tables 10. PHY Register Page 0: Port Status Page ................................................................................................22
Tables 11. PHY Register Port Status Page Fields ................................................................................................... 23
Tables 12. PHY Register Page 1: Vendor Identification Page ................................................................................ 24
Tables 13. PHY Register Vendor Identification Page Fields ................................................................................. 24

Data Sheet, Rev. 3

FW802B Low-Power PHY IEEE 1394A-2000

May 2004

Two-Cable Transceiver/Arbiter Device

Agere Systems Inc.

Description

(continued)

The PHY requires either an external 24.576 MHz
crystal or crystal oscillator. The internal oscillator
drives an internal phase-locked loop (PLL), which
generates the required 393.216 MHz reference signal.
The 393.216 MHz reference signal is internally divided
to provide the 49.152 MHz, 98.304 MHz, and
196.608 MHz clock signals that control transmission of
the outbound encoded strobe and data information.
The 49.152 MHz clock signal is also supplied to the
associated LLC for synchronization of the two chips
and is used for resynchronization of the received data.
The powerdown function, when enabled by the PD
signal high, stops operation of the PLL and disables all
circuitry except the cable-not-active (CNA) signal
circuitry.

The PHY supports an isolation barrier between itself
and its LLC. When /ISO is tied high, the link interface
outputs behave normally. When /ISO is tied low,
internal differentiating logic is enabled, and the outputs
become short pulses, which can be coupled through a
capacitor or transformer as described in the
IEEE 1394-1995 Annex J. To operate with bus-keeper
isolation, the /ISO pin of the FW802B must be tied
high.

Data bits to be transmitted through the cable ports are
received from the LLC on two, four, or eight data lines
(D[0:7]), and are latched internally in the PHY in
synchronization with the 49.152 MHz system clock.
These bits are combined serially, encoded, and
transmitted at 98.304 Mbits/s, 196.608 Mbits/s, or
393.216 Mbits/s as the outbound data-strobe
information stream. During transmission, the encoded
data information is transmitted differentially on the TPA
and TPB cable pair(s).

During packet reception, the TPA and TPB
transmitters of the receiving cable port are disabled,
and the receivers for that port are enabled. The
encoded data information is received on the TPA and
TPB cable pair. The received data-strobe information
is decoded to recover the receive clock signal and the
serial data bits. The serial data bits are split into two
(for S100), four (for S200), or eight (for S400) parallel
streams, resynchronized to the local system clock, and
sent to the associated LLC. The received data is also
transmitted (repeated) out of the other active
(connected) cable ports.

Both the TPA and TPB cable interfaces incorporate
differential comparators to monitor the line states
during initialization and arbitration. The outputs of
these comparators are used by the internal logic to
determine the arbitration status. The TPA channel

monitors the incoming cable common-mode voltage.
The value of this common-mode voltage is used during
arbitration to set the speed of the next packet
transmission. In addition, the TPB channel monitors
the incoming cable common-mode voltage for the
presence of the remotely supplied twisted-pair bias
voltage. This monitor is called bias-detect.

The TPBIAS circuit monitors the value of incoming
TPA pair common-mode voltage when local TPBIAS is
inactive. Because this circuit has an internal current
source and the connected node has a current sink, the
monitored value indicates the cable connection status.
This monitor is called connect-detect.

Both the TPB bias-detect monitor and TPBIAS
connect-detect monitor are used in suspend/resume
signaling and cable connection detection.

The PHY provides a 1.86 V nominal bias voltage for
driver load termination. This bias voltage, when seen
through a cable by a remote receiver, indicates the
presence of an active connection. The value of this
bias voltage has been chosen to allow interoperability
between transceiver chips operating from 5 V or 3 V
nominal supplies. This bias voltage source should be
stabilized by using an external filter capacitor of
approximately 0.33

The transmitter circuitry, the receiver circuitry, and the
twisted-pair bias voltage circuity are all disabled with a
powerdown condition. The powerdown condition
occurs when the PD input is high. The port transmitter
circuitry, the receiver circuitry, and the TPBIAS output
are also disabled when the port is disabled,
suspended, or disconnected.

The line drivers in the PHY operate in a high-
impedance current mode and are designed to work
with external 112

line-termination resistor networks.

One network is provided at each end of each twisted-
pair cable. Each network is composed of a pair of
series-connected 56

resistors. The midpoint of the

pair of resistors that is directly connected to the
twisted-pair A (TPA) signals is connected to the
TPBIAS voltage signal. The midpoint of the pair of
resistors that is directly connected to the twisted-pair B
(TPB) signals is coupled to ground through a parallel
RC network with recommended resistor and capacitor
values of 5 k

and 220 pF, respectively. The value of

the external resistors are specified to meet the
standard specifications when connected in parallel
with the internal receiver circuits.

The driver output current, along with other internal
operating currents, is set by an external resistor. This
resistor is connected between the R0 and R1 signals
and has a value of 2.49 k

1%.

FW802B Low-Power PHY IEEE 1394A-2000

Data Sheet, Rev. 3

Two-Cable Transceiver/Arbiter Device

May 2004

Agere Systems Inc.

Description

(continued)

The FW802B supports suspend/resume as defined in
the IEEE 1394a-2000 specification. The suspend
mechanism allows an FW802B port to be put into a
suspended state. In this state, a port is unable to
transmit or receive data packets, however, it remains
capable of detecting connection status changes and
detecting incoming TPBias. When all ports of the
FW802B are suspended, all circuits except the bias
voltage reference generator and bias detection circuits
are powered down, resulting in significant power
savings. The use of suspend/resume is recommended.

Four signals are used as inputs to set four
configuration status bits in the self-identification (self-
ID) packet. These signals are hardwired high or low as
a function of the equipment design. PC[0:2] are the
three signals that indicate either the need for power
from the cable or the ability to supply power to the
cable. The fourth signal, C/LKON, as an input,
indicates whether a node is a contender for bus
manager. When the C/LKON signal is asserted, it
means the node is a contender for bus manager. When
the signal is not asserted, it means that the node is not
a contender. The C bit corresponds to bit 20 in the self-
ID packet. PC[0:2] corresponds to the pwr field of the
Self-ID packet in the following manner: PC0
corresponds to bit 21, PC1 corresponds to bit 22, and
PC2 corresponds to bit 23 (see Self-ID packets table in
section 4.3.4.1 of the IEEE 1394a-2000 standard for
additional details).

A powerdown signal (PD) is provided to allow a
powerdown mode where most of the PHY circuits are
powered down to conserve energy in battery-powered
applications. The internal logic in FW802B is reset as
long as the powerdown signal is asserted. A cable
status signal, CNA, provides a high output when none
of the twisted-pair cable ports are receiving incoming
bias voltage. This output is not debounced. The CNA
output can be used to determine when to power the
PHY down or up. In the powerdown mode, all circuitry
is disabled except the CNA circuitry. It should be noted
that when the device is powered down, it does not act
in a repeater mode.

When the power supply of the PHY is removed while
the twisted-pair cables are connected, the PHY
transmitter and receiver circuitry has been designed to
present a high impedance to the cable in order to not
load the TPBIAS signal voltage on the other end of the
cable.

Whenever the TBA±/TPB± signals are wired to a
connector, they must be terminated using the normal
termination network (See Figure 4). This is required for
reliable operation. For those applications, when one of

the FW802B's ports is not wired to a connector, those
unused to a connector, those unused ports may be left
unconnected without normal termination. When a port
does not have a cable connected, internal connect-
detect circuitry will keep the port in a disconnected
state.

Note: All gap counts on all nodes of a 1394 bus must

be identical. The software accomplishes this by
issuing PHY configuration packets (see Section
4.3.4.3 of the IEEE 1394a-2000 standard) or by
issuing two bus resets, which resets the gap
counts to the maximum level (3Fh).

The link power status (LPS) signal works with the
C/LKON signal to manage the LLC power usage of the
node. The LPS signal indicates that the LLC of the
node is powered up or powered down. If LPS is inac-
tive for more than 1.2

s and less than 25

s, the

PHY/link interface is reset. If LPS is inactive for greater
than 25

s, the PHY will disable the PHY/link interface

to save power. FW802B continues its repeater function
even when the PHY/link interface is disabled. If the
PHY then receives a link-on packet, the C/LKON sig-
nal is activated to output a 6.114 MHz signal, which
can be used by the LLC to power itself up. Once the
LLC is powered up, the LPS signal communicates this
to the PHY and the PHY/link interface is enabled. The
C/LKON signal is turned off when LPS is active or
when a bus reset occurs, provided the interrupt that
caused C/LKON is not present.

When the PHY/link interface is in the disabled state, the
FW802B will automatically enter a low-power mode, if
all ports are inactive (disconnected, disabled, or sus-
pended). In this low-power mode, the FW802B disables
its PLL and also disables parts of its reference circuitry
depending on the state of the ports (some reference cir-
cuitry must remain active in order to detect incoming TP
bias). The lowest power consumption (the microlow-
power sleep mode) is attained when all ports
are either disconnected or disabled with the ports inter-
rupt enable bit (see Table 11) cleared. The FW802B will
exit the low-power mode when the LPS input is
asserted high or when a port event occurs that requires
the FW802B to become active in order to respond to the
event or to notify the LLC of the event (e.g., incoming
bias or disconnection is detected on a suspended port,
a new connection is detected on a nondisabled port,
etc.). When the FW802B is in the low-power mode, the
SYSCLK output will become active (and the PHY/link
interface will be initialized and become operative) within
3 ms after LPS is asserted high.

Two of the FW802B's signals are used to set up
various test conditions used only during the device
manufacturing process. These signals (SE and SM)
should be connected to V

for normal operation.

Agere Systems Inc.

Data Sheet, Rev. 3
May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

Signal Information

(continued)

Table 1. Signal Descriptions

Pin

Signal*

Type

Name/Description

C/LKON

I/O

Bus Manager Capable Input and Link-On Output. On hardware reset
(/RESET), this pin is used to set the default value of the contender status
indicated during self-ID. The bit value programming is done by tying the
signal through a 10 k

resistor to V

(high, bus manager capable) or to

GND (low, not bus manager capable). Using either the pull-up or pull-
down resistor allows the link-on output to override the input value when
necessary.

After hardware reset, this pin is set as an output. If the LPS is inactive,
C/LKON indicates one of the following events by asserting a 6.114 MHz
signal.

1. FW802B receives a link-on packet addressed to this node.
2. Port_event register bit is 1.
3. Any of the Timeout, Pwr_fail, or Loop register bits are 1 and the

Watchdog register bit is also 1.

4. Once activated, the C/LKON output will continue active until the LPS

becomes active. The PHY also deasserts the C/LKON output when a

1394 bus reset occurs, if the C/LKON is active due solely to the recep-

tion of a link-on packet.

Note: If an interrupt condition exists which would otherwise cause the

C/LKON output to be activated if the LPS were inactive, the
C/LKON output will be activated when the LPS subsequently
becomes inactive.

CNA

Cable-Not-Active Output. CNA is asserted high when none of the PHY
ports are receiving an incoming bias voltage. This circuit remains active
during the powerdown mode.

CPS

Cable Power Status. CPS is normally connected to the cable power
through a 400 k

resistor. This circuit drives an internal comparator that

detects the presence of cable power. This information is maintained in one
internal register and is available to the LLC by way of a register read (see
Table 8, address register 0000

, bit 7/PS). In applications that do not sink

or source 1394 power (VP), this pin can be tied to ground.

Note: When this pin is grounded, the Pwr_fail bit in PHY register 0101

will

be set.

CTL0

I/O

Control I/O. The CTLn signals are bidirectional communications control
signals between the PHY and the LLC. These signals control the passage
of information between the two devices. Bus-keeper circuitry is built into
these terminals.

CTL1

5, 6, 8,

9, 10, 11,

12, 13

D[0:7]

I/O

Data I/O. The Dn signals are bidirectional and pass data between the
PHY and the LLC. Bus-keeper circuitry is built into these terminals.

* Active-low signals are indicated by "/" at the beginning of signal names, within this document.

Agere Systems Inc.

Data Sheet, Rev. 3

May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

Signal Information

(continued)

Table 1. Signal Descriptions (continued)

Pin

Signal*

Type

Name/Description

/ISO

Link Interface Isolation Disable Input (Active-Low). /ISO controls the
operation of an internal pulse differentiating function used on the
PHY-LLC interface signals, CTLn and Dn, when they operate as outputs.
When /ISO is asserted low, the isolation barrier is implemented between
PHY and its LLC (as described in Annex J of IEEE 1394-1995).
/ISO is normally tied high to disable isolation differentiation. Bus-keepers
are enabled when /ISO is high (inactive) on CTLn, Dn, and LREQ. When
/ISO is low (active), the bus-keepers are disabled. Please refer to Agere's
application note IEEE 1394 Isolation (AP98-074CMPR) for more informa-
tion.

LPS

Link Power Status. LPS is connected to either the V

supplying the

LLC or to a pulsed output that is active when the LLC is powered for the
purpose of monitoring the LLC power status. If LPS is inactive for more
than 1.2

s and less than 25

s, the PHY-link interface is reset. If LPS is

inactive for greater than 25

s, the PHY will disable the PHY/link interface

to save power. FW802B continues its repeater function.

LREQ

Link Request. LREQ is an output from the LLC that requests the PHY to
perform some service. Bus-keeper circuitry is built into this terminal.

44, 45, 46,

47, 48

No Connect.

PC0

Power-Class Indicators. On hardware reset (/RESET), these inputs set
the default value of the power class indicated during SelfID. These bits can
be tied to V

(high) or to ground (low) as required for particular power

consumption and source characteristics. In SelfID packet (see Section
4.3.4.1 of the 1394a-2000 Specification), PC0, the most significant bit of
this 3-bit field, corresponds to bit 20, PC1 corresponds to bit 21, and PC2
corresponds to bit 22. As an example, for a Power_Class value of 001,
PC0 = 0, PC1 = 0, and PC2 = 1.

PC1

PC2

Powerdown. When asserted high, PD turns off all internal circuitry except
the bias-detect circuits that drive the CNA signal. Internal FW802B logic is
kept in the reset state as long as PD is asserted. The PD terminal is
provided for backward compatibility. It is recommended that the FW802B
be allowed to manage its own power consumption using suspend/resume
in conjunction with LPS. C/LKON features are defined in the IEEE 1394a-
2000 specification.

PLL

Power for PLL Circuit. V

PLL supplies power to the PLL circuitry

portion of the device.

PLL

Ground for PLL Circuit. V

PLL is tied to a low-impedance ground

plane.

Current Setting Resistor. An internal reference voltage is applied to a
resistor connected between R0 and R1 to set the operating current and
the cable driver output current. A low temperature-coefficient resistor
(TCR) with a value of 2.49 k

1% should be used to meet the

IEEE 1394-1995 standard requirements for output voltage limits.

* Active-low signals are indicated by "/" at the beginning of signal names, within this document.

Agere Systems Inc.

Data Sheet, Rev. 3
May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

/RESET

Reset (Active-Low). When /RESET is asserted low (active), a 1394 bus
reset condition is set on the active cable ports and the FW802B is reset to
the reset start state. To guarantee that the PHY will reset, this pin must be
held low for at least 2 ms. An internal pull-up resistor connected to V

provided so that only an external delay capacitor (0.1

F) and resistor

(510 k

)

, in parallel, are required to connect this pin to ground. This

circuitry will ensure that the capacitor will be discharged when PHY power
is removed. This input is a standard logic buffer and can also be driven by
an open-drain logic output buffer. Do not leave this pin unconnected.

Test Mode Control. SE is used during Agere's manufacturing test and
should be tied to V

for normal operation.

Test Mode Control. SM is used during Agere's manufacturing test and
should be tied to V

for normal operation.

SYSCLK

System Clock. SYSCLK provides a 49.152 MHz clock signal, which is
synchronized with the data transfers to the LLC.

TPA0+

Analog I/O Port0, Port Cable Pair A. TPA0± is the port A connection to the twisted-

pair cable. Board traces from each pair of positive and negative differen-
tial signal pins should be kept as short as possible and matched to the
external load resistors and to the cable connector. When the FW802B's
1394 port pins are not wired to a connector, the unused port pins may be left
unconnected. Internal connect-detect circuitry will keep the port in a discon-
nected state.

TPA0

TPA1

Analog I/O Port1, Port Cable Pair A. TPA1± is the port A connection to the twisted-

pair cable. Board traces from each pair of positive and negative differen-
tial signal pins should be kept as short as possible and matched to the
external load resistors and to the cable connector. When the FW802B's
1394 port pins are not wired to a connector, the unused port pins may be
left unconnected. Internal connect-detect circuitry will keep the port in a
disconnected state.

TPA1

TPB0+

Analog I/O Port0, Port Cable Pair B. TPB0± is the port B connection to the twisted-

pair cable. Board traces from each pair of positive and negative differen-
tial signal pins should be kept as short as possible and matched to the
external load resistors and to the cable connector. When the FW802B's
1394 port pins are not wired to a connector, the unused port pins may be
left unconnected. Internal connect-detect circuitry will keep the port in a
disconnected state.

TPB0

TPB1

Analog I/O Port1, Port Cable Pair B. TPB1± is the port B connection to the twisted-

pair cable. Board traces from each pair of positive and negative differen-
tial signal pins should be kept as short as possible and matched to the
external load resistors and to the cable connector. When the FW802B's
1394 port pins are not wired to a connector, the unused port pins may be
left unconnected. Internal connect-detect circuitry will keep the port in a
disconnected state.

TPB1

Signal Information

(continued)

Table 1. Signal Descriptions (continued)

Pin

Signal*

Type

Name/Description

* Active-low signals are indicated by "/" at the beginning of signal names, within this document.

Agere Systems Inc.

Data Sheet, Rev. 3

May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

TPBIAS0

Analog I/O Portn, Twisted-Pair Bias. (Where n refers to the port number). TPBIAS

provides the 1.86 V nominal bias voltage needed for proper operation of
the twisted-pair cable drivers and receivers and for sending a valid cable
connection signal to the remote nodes. When the FW802B's 1394 port
pins are not wired to a connector, the unused port pins may be left uncon-
nected. Internal connect-detect circuitry will keep the port in a discon-
nected state.

TPBIAS1

7, 17,

26, 27, 62

Digital Power. V

supplies power to the digital portion of the device.

30, 31,

43, 50, 51

DDA

Analog Circuit Power. V

DDA

supplies power to the analog portion of the

device.

2, 14,

25, 56, 64

Digital Ground. All V

signals should be tied to the low-impedance

ground plane.

32, 49,

52, 53

SSA

Analog Circuit Ground. All V

SSA

signals should be tied together to a low-

impedance ground plane.

Crystal Oscillator. XI and XO connect to a 24.576 MHz parallel resonant
fundamental mode crystal. Although, when a 24.576 MHz clock source is
used, it can be connected to XI with XO left unconnected. The optimum
values for the external load capacitors and resistor are dependent on the
specifications of the crystal used. It is necessary to add an external series
resistor (R

) to the XO pin (see Figures 3 and 5). For more details, refer to

the Crystal Selection Considerations section in the data sheet. Note that it
is very important to place the crystal as close as possible to the XO and XI
pins, i.e., within 0.5 in./1.27 cm.

Signal Information

(continued)

Table 1. Signal Descriptions (continued)

Pin

Signal*

Type

Name/Description

* Active-low signals are indicated by "/" at the beginning of signal names, within this document.

Agere Systems Inc.

Data Sheet, Rev. 3

May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

Application Information

(continued)

5-6930 (F)

Figure 4. Typical Port Termination Network

Crystal Selection Considerations

The FW802B is designed to use an external 24.576 MHz parallel resonant fundamental mode crystal connected
between the XI and XO terminals to provide the reference for an internal oscillator circuit. The IEEE 1394a-2000
standard requires that FW802B have less than

100 ppm total variation from the nominal data rate, which is

directly influenced by the crystal. To achieve this, it is recommended that an oscillator with a nominal 50 ppm or
less frequency tolerance be used.

The total frequency variation must be kept below

100 ppm from nominal with some allowance for error introduced

by board and device variations. Trade offs between frequency tolerance and stability may be made as long as the
total frequency variation is less than

100 ppm.

TPBIAS1

TPA1+

TPA1

TPB1+

TPB1

TPBIAS0

TPA0+

TPA0

TPB0+

TPB0

TPBIAS1

5 k

220 pF

0.33

IEEE 1394-1995 STANDARD

CONNECTOR

USE SAME PORT TERMINATION NETWORK AS ILLUSTRATED BELOW.

CABLE

POWER

Agere Systems Inc.

Data Sheet, Rev. 3
May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

Crystal Selection Considerations

(continued)

Load Capacitance

The frequency of oscillation is dependent upon the load capacitance specified for the crystal, in parallel resonant
mode crystal circuits. Total load capacitance (C

) is a function of not only the discrete load capacitors, but also

capacitances from the FW802B board traces and capacitances of the other FW802B connected components.

The values for load capacitors (C

and C

) should be calculated using this formula:

= C

= (C

stray

)

Where:
C

= load capacitance specified by the crystal manufacturer

Cstray = capacitance of the board and the FW802B, typically 2 pF--3 pF
R

= load resistance; the value of R

is dependent on the specific crystal used. Please refer to your crystal manufacturer's data sheet

and application notes to determine an appropriate value.

Figure 5. Crystal Circuitry

Adjustment to Crystal Loading

The resistor (R

in Figure 5 is recommended for fine-tuning the crystal circuit. The value for this resistor is depen-

dent on the specific crystal used. Please refer to your crystal manufacturer's data sheet and application notes to
determine an appropriate value for R

. A more precise value for this resistor can be obtained by placing different

values of R

on a production board and using an oscilloscope to view the resultant clock waveform at node A for

each resistor value. The desired waveform should have the following characteristics: the waveform should be sinu-
soidal, with an amplitude as large as possible, but not greater than 3.3 V or less than 0 volts.

Crystal/Board Layout

The layout of the crystal portion of the PHY circuit is important for obtaining the correct frequency and minimizing
noise introduced into the FW802B PLL. The crystal and two load capacitors (C

+ C

) should be considered as a

unit during layout. They should be placed as close as possible to one another, while minimizing the loop area cre-
ated by the combination of the three components. Minimizing the loop area minimizes the effect of the resonant
current that flows in this resonant circuit. This layout unit (crystal and load capacitors) should then be placed as
close as possible to the PHY XI and XO terminals to minimize trace lengths. Vias should not be used to route the
XI and XO signals.

1394 Application Support Contact Information

E-mail: support1394@agere.com

Agere Systems Inc.

Data Sheet, Rev. 3
May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

Electrical Characteristics

Table 3. Analog Characteristics

Parameter

Test Conditions

Symbol

Min

Typ

Max

Unit

Supply Voltage

Source power node

DD--SP

3.0

3.3

3.6

Differential Input Voltage

Cable inputs, 100 Mbits/s operation

ID--100

142

260

Cable inputs, 200 Mbits/s operation

ID--200

132

260

Cable inputs, 400 Mbits/s operation

ID--400

100

260

Cable inputs, during arbitration

ID--ARB

168

265

Common-mode Voltage

Source Power Mode

TPB cable inputs,

speed signaling off

1.165

2.515

TPB cable inputs,

S100 speed signaling on

CM--SP--100

1.165

2.515

TPB cable inputs,

S200 speed signaling on

CM--SP--200

0.935

2.515

TPB cable inputs,

S400 speed signaling on

CM--SP--400

0.532

2.515

Common-mode Voltage

Nonsource Power Mode*

* For a node that does not source power (see Section 4.2.2.2 in IEEE 1394-1995 Standard).

TPB cable inputs,

speed signaling off

1.165

2.015

TPB cable inputs,

S100 speed signaling on

CM--NSP--100

1.165

2.015

TPB cable inputs,

S200 speed signaling on

CM--NSP--200

0.935

2.015

TPB cable inputs,

S400 speed signaling on

CM--NSP--400

0.532

2.015

Receive Input Jitter

TPA, TPB cable inputs,

100 Mbits/s operation

1.08

TPA, TPB cable inputs,

200 Mbits/s operation

0.5

TPA, TPB cable inputs,

400 Mbits/s operation

0.315

Receive Input Skew

Between TPA and TPB cable inputs,

100 Mbits/s operation

0.8

Between TPA and TPB cable inputs,

200 Mbits/s operation

0.55

Between TPA and TPB cable inputs,

400 Mbits/s operation

0.5

Positive Arbitration

Comparator Input
Threshold Voltage

168

Negative Arbitration

Comparator Input
Threshold Voltage

168

Speed Signal Input

Threshold Voltage

200 Mbits/s

TH--S200

139

400 Mbits/s

TH--S400

266

445

Output Current

TPBIAS outputs

2.5

TPBIAS Output Voltage

At rated I/O current

1.665

2.015

Current Source for

Connect Detect Circuit

Agere Systems Inc.

Data Sheet, Rev. 3
May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

Electrical Characteristics

(continued)

Table 5. Device Characteristics

* Device is capable of both differentiated and undifferentiated operation.

Parameter

Test Conditions

Symbol

Min

Typ

Max

Unit

Supply Current:

One Port Active

All Ports Active

No Ports Active, (Microlow-

power Sleep Mode) LPS = 0

PD = 1

= 3.3 V

--
--
--

54
74
50

--
--
--

mA
mA

High-level Output Voltage

max, V

= min

0.4

Low-level Output Voltage

min, V

= max

0.4

High-level Input Voltage

CMOS inputs

0.7 V

Low-level Input Voltage

CMOS inputs

0.2 V

Pull-up Current,

/RESET Input

= 0 V

Powerup Reset Time,

/RESET Input

= 0 V

Rising Input Threshold Voltage
/RESET Input

RST

1.1

1.4

Output Current

SYSCLK

@ TTL

Control, data

@ CMOS

CNA

C/LKON

Input Current,

LREQ, LPS, PD, SE, SM,
PC[0:2] Inputs

= V

or 0 V

Off-state Output Current,

CTL[0:1], D[0:7], C/LKON I/Os

= V

or 0 V

Power Status Input Threshold

Voltage, CPS Input

400 k

resistor

7.5

8.5

Rising Input Threshold Voltage*,

LREQ, CTLn, Dn

/2 + 0.3

/2 + 0.8

Falling Input Threshold Voltage*,

LREQ, CTLn, Dn

/2 0.8

/2 0.3

Bus Holding Current,

LREQ, CTLn, Dn

= 1/2(V

)

250

550

Rising Input Threshold Voltage

LPS

LIH

0.24 V

+ 1

Falling Input Threshold Voltage

LPS

LIL

0.24 V

+ 0.2

Agere Systems Inc.

Data Sheet, Rev. 3

May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

Internal Register Configuration

The PHY register map is shown below in Table 8. (Refer to IEEE 1394a-2000, 5B.1 for more information).

Table 8. PHY Register Map for the Cable Environment

The meaning of the register fields within the PHY register map are defined by Table 9 below. Power reset values
not specified are resolved by the operation of the PHY state machines subsequent to a power reset.

Table 9. PHY Register Fields for the Cable Environment

Address

Contents

Bit 0

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

0000

Physical_ID

0001

RHB

IBR

Gap_count

0010

Extended (7)

XXXXX

Total_ports

0011

Max_speed

XXXXX

Delay

0100

LCtrl

Contender

Jitter

Pwr_class

0101

Watchdog

ISBR

Loop

Pwr_fail

Timeout

Port_event Enab_accel Enab_multi

0110

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

XXXXX

0111

Page_select

XXXXX

Port_select

1000

Page_select

1111

Page_select

REQUIRED

XXXXX

RESERVED

Field

Size Type

Power Reset

Value

Description

Physical_ID

000000

The address of this node determined during self-identification. A
value of 63 indicates a malconfigured bus; the link will not transmit
any packets.

When set to one, indicates that this node is the root.

Cable power active.

RHB

Root Hold-off Bit. When set to one, the force_root variable is
TRUE, which instructs the PHY to attempt to become the root dur-
ing the next tree identify process.

IBR

Initiate Bus Reset. When set to one, instructs the PHY to set ibr
TRUE and reset_time to RESET_TIME. These values in turn
cause the PHY to initiate a bus reset without arbitration; the reset
signal is asserted for 166

s. This bit is self-clearing.

Gap_count

Used to configure the arbitration timer setting in order to optimize
gap times according to the topology of the bus. See Section 4.3.6
of IEEE Standard 1394a-2000 for the encoding of this field.

Extended

This field has a constant value of seven, which indicates the
extended PHY register map.

Agere Systems Inc.

Data Sheet, Rev. 3
May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

Internal Register Configuration

(continued)

Table 9. PHY Register Fields for the Cable Environment (continued)

Field

Size Type Power Reset Value

Description

Total_ports

The number of ports implemented by this PHY. This count
reflects the number.

Max_speed

010

Indicates the speed(s) this PHY supports:
000

= 98.304 Mbits/s

001

= 98.304 and 196.608 Mbits/s

010

= 98.304, 196.608, and 393.216 Mbits/s

011

= 98.304, 196.608, 393.216, and 786.43 Mbits/s

100

= 98.304, 196.608, 393.216, 786.432, and

1,572.864 Mbits/s

101

= 98.304, 196.608, 393.216, 786.432, 1,572.864, and

3,145.728 Mbits/s

All other values are reserved for future definition.

Delay

0000

Worst-case repeater delay, expressed as 144 + (delay * 20) ns.

LCtrl

Link Active. Cleared or set by software to control the value of
the L bit transmitted in the node's self-ID packet 0, which will be
the logical AND of this bit and LPS active.

Contender

See description.

Cleared or set by software to control the value of the C bit
transmitted in the self-ID packet. Powerup reset value is set by
C/LKON pin.

Jitter

000

The difference between the fastest and slowest repeater data
delay, expressed as (jitter + 1) * 20 ns.

Pwr_class

See description.

Power-Class. Controls the value of the pwr field transmitted in
the self-ID packet. See Section 4.3.4.1 of IEEE Standard
1394a-2000 for the encoding of this field. PC0, PC1, and PC2
pins set up power reset value.

Watchdog

When set to one, the PHY will set Port_event to one if resume
operations commence for any port.

ISBR

Initiate Short (Arbitrated) Bus Reset. A write of one to this bit
instructs the PHY to set ISBR true and reset_time to
SHORT_RESET_TIME. These values in turn cause the PHY to
arbitrate and issue a short bus reset. This bit is self-clearing.

Loop

Loop Detect. A write of one to this bit clears it to zero.

Pwr_fail

Cable Power Failure Detect. Set to one when the PS bit
changes from one to zero. A write of one to this bit clears it to
zero.

Timeout

Arbitration State Machine Timeout. A write of one to this bit
clears it to zero (see MAX_ARB_STATE_TIME).

Port_event

Port Event Detect. The PHY sets this bit to one if any of con-
nected, bias, disabled, or fault change for a port whose
Int_enable bit is one. The PHY also sets this bit to one if
resume operations commence for any port and Watchdog is
one. A write of one to this bit clears it to zero.

Agere Systems Inc.

Data Sheet, Rev. 3

May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

Internal Register Configuration

(continued)

Table 9. PHY Register Fields for the Cable Environment (continued)

The port status page is used to access configuration and status information for each of the PHY's ports. The port is
selected by writing zero to Page_select and the desired port number to Port_select in the PHY register at address
0111

. The format of the port status page is illustrated by Table 10 below; reserved fields are shown shaded. The

meanings of the register fields with the port status page are defined by Table 11.

Table 10. PHY Register Page 0: Port Status Page

Field

Size Type

Power Reset

Value

Description

Enab_accel

Enable Arbitration Acceleration. When set to one, the PHY will
use the enhancements specified in Section 4.4 of 1394a-2000
specification. PHY behavior is unspecified if the value of
Enab_accel is changed while a bus request is pending.

Enab_multi

Enable Multispeed Packet Concatenation. When set to one, the
link will signal the speed of all packets to the PHY.

Page_select

000

Selects which of eight possible PHY register pages are accessible
through the window at PHY register addresses 1000

through

1111

, inclusive.

Port_select

000

If the page selected by Page_select presents per-port information,
this field selects which port's registers are accessible through the
window at PHY register addresses 1000

through 1111

, inclusive.

Ports are numbered monotonically starting at zero, p0.

Address

Contents

Bit 0

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

1000

AStat

BStat

Child

Connected

Bias

Disabled

1001

Negotiated_speed

Int_enable

Fault

XXXXX XXXXX

XXXXX

1010

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

XXXXX

1011

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

XXXXX

1100

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

XXXXX

1101

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

XXXXX

1110

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

XXXXX

1111

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

XXXXX

REQUIRED

XXXXX

RESERVED

Agere Systems Inc.

Data Sheet, Rev. 3
May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

Internal Register Configuration

(continued)

The meaning of the register fields with the port status page are defined by Table 11 below.

Table 11. PHY Register Port Status Page Fields

Field

Size Type

Power Reset

Value

Description

AStat

TPA line state for the port:
00

= invalid

= 1

= 0

= Z

BStat

TPB line state for the port (same encoding as AStat).

Child

If equal to one, the port is a child; otherwise, a parent. The
meaning of this bit is undefined from the time a bus reset is
detected until the PHY transitions to state T1: Child Hand-
shake during the tree identify process (see Section 4.4.2.2 in
IEEE Standard 1394-1995).

Connected

If equal to one, the port is connected.

Bias

If equal to one, incoming TPBIAS is detected.

Disabled

If equal to one, the port is disabled.

Negotiated_speed

000

Indicates the maximum speed negotiated between this PHY
port and its immediately connected port; the encoding is the
same as for the PHY register Max_speed field.

Int_enable

Enable Port Event Interrupts. When set to one, the PHY
will set Port_event to one if any of connected, bias, disabled,
or fault (for this port) change state.

Fault

Set to one if an error is detected during a suspend or resume
operation. A write of one to this bit clears it to zero.

Agere Systems Inc.

Data Sheet, Rev. 3

May 2004

Two-Cable Transceiver/Arbiter Device

FW802B Low-Power PHY IEEE 1394A-2000

Internal Register Configuration

(continued)

The vendor identification page is used to identify the PHY's vendor and compliance level. The page is selected by
writing one to Page_select in the PHY register at address 0111

. The format of the vendor identification page is

shown in Table 12; reserved fields are shown shaded.

Table 12. PHY Register Page 1: Vendor Identification Page

The meaning of the register fields within the vendor identification page are defined by Table 13.

Table 13. PHY Register Vendor Identification Page Fields

The vendor-dependent page provides access to information used in manufacturing test of the FW802B.

Address

Contents

Bit 0

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

1000

Compliance_level

1001

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

XXXXX

1010

1011

Vendor_ID

1100

1101

1110

Product_ID

1111

REQUIRED

XXXXX

RESERVED

Field

Size Type

Description

Compliance_level

Standard to which the PHY implementation complies:
0 = not specified
1 = IEEE 1394a-2000
Agere's FW802B compliance level is 1.
All other values reserved for future standardization.

Vendor_ID

The company ID or organizationally unique identifier (OUI) of the manufacturer
of the PHY. Agere's vendor ID is 00601D

. This number is obtained from the

IEEE registration authority committee (RAC). The most significant byte of
Vendor_ID appears at PHY register location 1010

and the least significant at

1100

Product_ID

The meaning of this number is determined by the company or organization that
has been granted Vendor_ID. Agere's FW802B product ID is 080201

. The

most significant byte of Product_ID appears at PHY register location 1101

and

the least significant at 1111

Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application.
Agere is a registered trademark of Agere Systems, Inc. Agere Systems and the Agere logo are trademarks of Agere Systems Inc.

May 2004
DS02-355CMPR-3 (Replaces DS02-355CMPR-2)

For additional information, contact your Agere Systems Account Manager or the following:
INTERNET:

http://www.agere.com

E-MAIL:

docmaster@agere.com

N. AMERICA:

Agere Systems Inc., Lehigh Valley Central Campus, Room 10A-301C, 1110 American Parkway NE, Allentown, PA 18109-9138
1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106)

ASIA:

Agere Systems Hong Kong Ltd., Suites 3201 & 3210-12, 32/F, Tower 2, The Gateway, Harbour City, Kowloon
Tel. (852) 3129-2000, FAX (852) 3129-2020
CHINA: (86) 21-54614688 (Shanghai), (86) 755-25881122 (Shenzhen)
JAPAN: (81) 3-5421-1600 (Tokyo), KOREA: (82) 2-767-1850 (Seoul), SINGAPORE: (65) 6778-8833, TAIWAN: (886) 2-2725-5858 (Taipei)

EUROPE:

Tel. (44)1344 296 400

1394 is a trademark and IEEE is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.
The FireWire logo is a trademark and FireWire is a registered trademark of Apple Computer, Inc.

Document Outline

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: L-FW802B-DB

Document Outline

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: L-FW802B-DB