ADVANCE INFORMATION

This document contains information on a product under development at Advanced Micro Devices. The information
is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed
product without notice.

Publication# 25903

Rev: B Amendment+0

Issue Date: October 31, 2002

Refer to AMD's Website (www.amd.com) for the latest information.

Am29BDS640G

64 Megabit (4 M x 16-Bit)
CMOS 1.8 Volt-only Simultaneous Read/Write, Burst Mode Flash Memory

DISTINCTIVE CHARACTERISTICS

ARCHITECTURAL ADVANTAGES

Single 1.8 volt read, program and erase (1.65 to 1.95
volt)

Manufactured on 0.17 µm process technology

Enhanced VersatileIOTM (V

) Feature

-- Device generates data output voltages and tolerates

data input voltages as determined by the voltage on
the V

-- 1.8V and 3V compatible I/O signals

Simultaneous Read/Write operation

-- Data can be continuously read from one bank while

executing erase/program functions in other bank

-- Zero latency between read and write operations

-- Four bank architecture: 16Mb/16Mb/16Mb/16Mb

Programmable Burst Interface

-- 2 Modes of Burst Read Operation

-- Linear Burst: 8, 16, and 32 words with wrap-around

-- Continuous Sequential Burst

Sector Architecture

-- Eight 8 Kword sectors and one hundred twenty-six 32

Kword sectors

-- Banks A and D each contain four 8 Kword sectors

and thirty-one 32 Kword sectors; Banks B and C
each contain thirty-two 32 Kword sectors

-- Eight 8 Kword boot sectors, four at the top of the

address range, and four at the bottom of the address
range

Minimum 1 million erase cycle guarantee per sector

20-year data retention at 125°C

-- Reliable operation for the life of the system

80-ball FBGA package

PERFORMANCE CHARCTERISTICS

Read access times at 54/40 MHz (at 30 pF)

-- Burst access times of 13.5/20 ns

-- Asynchronous random access times of 70 ns

-- Initial Synchronous access times as fast as 87.5/95 ns

Power dissipation (typical values, C

= 30 pF)

-- Burst Mode Read: 10 mA

-- Simultaneous Operation: 25 mA

-- Program/Erase: 15 mA

-- Standby mode: 0.2 µA

HARDWARE FEATURES

Sector Protection

-- Software command sector locking

Reduced Wait-State Handshaking feature available

-- Provides host system with minimum possible latency

by monitoring RDY

Hardware reset input (RESET#)

-- Hardware method to reset the device for reading array

data

WP# input
-- Write protect (WP#) function protects sectors 0 and 1

(bottom boot), or sectors 132 and 133 (top boot),
regardless of sector protect status

ACC input: Acceleration function reduces
programming time; all sectors locked when ACC = V

CMOS compatible inputs, CMOS compatible outputs

Low V

write inhibit

SOFTWARE FEATURES

Supports Common Flash Memory Interface (CFI)

Software command set compatible with JEDEC 42.4
standards

-- Backwards compatible with Am29F and Am29LV

families

Data# Polling and toggle bits

-- Provides a software method of detecting program

and erase operation completion

Erase Suspend/Resume

-- Suspends an erase operation to read data from, or

program data to, a sector that is not being erased,
then resumes the erase operation

Unlock Bypass Program command
-- Reduces overall programming time when issuing

multiple program command sequences

Am29BDS640G

October 31, 2002

A D V A N C E I N F O R M A T I O N

GENERAL DESCRIPTION

The Am29BDS640G is a 64 Mbit, 1.8 Volt-only, simulta-
neous Read/Write, Burst Mode Flash memory device, orga-
nized as 4,194,304 words of 16 bits each. This device uses
a single V

of 1.65 to 1.95 V to read, program, and erase

the memory array. The device supports Enhanced V

offer up to 3V compatible inputs and outputs. A 12.0-volt V

may be used for faster program performance if desired. The
device can also be programmed in standard EPROM pro-
grammers.

At 54 MHz, the device provides a burst access of 13.5 ns at
30 pF with a latency of 87.5 ns at 30 pF. At 40 MHz, the de-
vice provides a burst access of 20 ns at 30 pF with a latency
of 95 ns at 30 pF. The device operates within the industrial
temperature range of -40°C to +85°C. The device is offered
in the 80-ball FBGA package.

The Simultaneous Read/Write architecture provides simul-
taneous operation by dividing the memory space into four
banks. The device can improve overall system performance
by allowing a host system to program or erase in one bank,
then immediately and simultaneously read from another
bank, with zero latency. This releases the system from wait-
ing for the completion of program or erase operations.

The device is divided as shown in the following table:

The Enhanced VersatileIOTM (V

) control allows the host

system to set the voltage levels that the device generates at
its data outputs and the voltages tolerated at its data inputs
to the same voltage level that is asserted on the V

pin.

This allows the device to operate in 1.8 V and 3 V system
environments as required.

The device uses Chip Enable (CE#), Write Enable (WE#),
Address Valid (AVD#) and Output Enable (OE#) to control
asynchronous read and write operations. For burst opera-
tions, the device additionally requires Ready (RDY), and
Clock (CLK). This implementation allows easy interface with
minimal glue logic to a wide range of microprocessors/micro-
controllers for high performance read operations.

The burst read mode feature gives system designers flexibil-
ity in the interface to the device. The user can preset the
burst length and wrap through the same memory space, or
read the flash array in continuous mode.

The clock polarity feature provides system designers a
choice of active clock edges, either rising or falling. The ac-
tive clock edge initiates burst accesses and determines
when data will be output.

The device is entirely command set compatible with the
JEDEC 42.4 single-power-supply Flash standard. Com-
mands are written to the command register using standard
microprocessor write timing. Register contents serve as in-
puts to an internal state-machine that controls the erase and
programming circuitry. Write cycles also internally latch ad-
dresses and data needed for the programming and erase
operations. Reading data out of the device is similar to read-
ing from other Flash or EPROM devices.

The Erase Suspend/Erase Resume feature enables the
user to put erase on hold for any period of time to read data
from, or program data to, any sector that is not selected for
erasure. True background erase can thus be achieved.

The hardware RESET# pin terminates any operation in
progress and resets the internal state machine to reading
array data. The RESET# pin may be tied to the system reset
circuitry. A system reset would thus also reset the device,
enabling the system microprocessor to read boot-up firm-
ware from the Flash memory device.

The host system can detect whether a program or erase op-
eration is complete by using the device status bit DQ7
(Data# Polling) and DQ6/DQ2 (toggle bits). After a program
or erase cycle has been completed, the device automatically
returns to reading array data.

The sector erase architecture allows memory sectors to be
erased and reprogrammed without affecting the data con-
tents of other sectors. The device is fully erased when
shipped from the factory.

Hardware data protection measures include a low V

de-

tector that automatically inhibits write operations during
power transitions. The device also offers two types of data
protection at the sector level. The sector lock/unlock com-
mand sequence disables or re-enables both program and
erase operations in any sector. When at V

, WP# locks sec-

tors 0 and 1 (bottom boot device) or sectors 132 and 133
(top boot device).

The device offers two power-saving features. When ad-
dresses have been stable for a specified amount of time, the
device enters the automatic sleep mode. The system can
also place the device into the standby mode. Power con-
sumption is greatly reduced in both modes.

AMD's Flash technology combines years of Flash memory
manufacturing experience to produce the highest levels of
quality, reliability and cost effectiveness. The device electri-
cally erases all bits within a sector simultaneously via
Fowler-Nordheim tunnelling. The data is programmed using
hot electron injection.

Bank

Quantity

Size

8 Kwords

32 Kwords

8 Kwords

October 31, 2002

Am29BDS640G

A D V A N C E I N F O R M A T I O N

TABLE OF CONTENTS

Product Selector Guide . . . . . . . . . . . . . . . . . . . . . 5
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Block Diagram of Simultaneous
Operation Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . 8

Special Handling Instructions for FBGA Package .................... 8

Input/Output Descriptions . . . . . . . . . . . . . . . . . . . 9
Logic Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Ordering Information . . . . . . . . . . . . . . . . . . . . . . 10
Device Bus Operations . . . . . . . . . . . . . . . . . . . . . 11

Table 1. Device Bus Operations ....................................................11

Enhanced VersatileIOTM (V

) Control .................................... 11

Requirements for Asynchronous Read
Operation (Non-Burst) ............................................................ 11
Requirements for Synchronous (Burst) Read Operation ........ 12
8-, 16-, and 32-Word Linear Burst with Wrap Around ............ 12

Table 2. Burst Address Groups .......................................................12

Burst Mode Configuration Register ........................................ 12
Reduced Wait-State Handshaking Option .............................. 13
Simultaneous Read/Write Operations with Zero Latency ....... 13
Writing Commands/Command Sequences ............................ 13
Accelerated Program Operation ............................................. 13
Autoselect Functions .............................................................. 13
Standby Mode ........................................................................ 14
Automatic Sleep Mode ........................................................... 14
RESET#: Hardware Reset Input ............................................. 14
Output Disable Mode .............................................................. 14
Hardware Data Protection ...................................................... 14
Write Protect (WP#) ................................................................ 14
Low V

Write Inhibit .............................................................. 15

Write Pulse "Glitch" Protection ............................................... 15
Logical Inhibit .......................................................................... 15
Power-Up Write Inhibit ............................................................ 15
V

and V

Power-up And Power-down Sequencing ........... 15

Common Flash Memory Interface (CFI) . . . . . . . 15

Table 3. CFI Query Identification String ..........................................15
Table 4. System Interface String .....................................................16
Table 5. Device Geometry Definition ..............................................16
Table 6. Primary Vendor-Specific Extended Query ........................17
Table 7. Sector Address Table ........................................................18

Command Definitions . . . . . . . . . . . . . . . . . . . . . . 22

Reading Array Data ................................................................ 22
Set Burst Mode Configuration Register Command Sequence 22

Figure 1. Synchronous/Asynchronous State Diagram .................... 22

Read Mode Setting ................................................................. 22
Programmable Wait State Configuration ................................ 22

Table 8. Programmable Wait State Settings ...................................23

Reduced Wait-State Handshaking Option .............................. 23

Table 9. Initial Access Cycles vs. Frequency ..................................23

Standard Handshaking Operation .......................................... 23

Table 10. Wait States for Standard Handshaking ...........................23

Burst Read Mode Configuration ............................................. 23

Table 11. Burst Read Mode Settings ..............................................24

Burst Active Clock Edge Configuration ................................... 24
RDY Configuration .................................................................. 24
Configuration Register ............................................................ 24

Table 12. Burst Mode Configuration Register .................................24

Sector Lock/Unlock Command Sequence .............................. 24
Reset Command ..................................................................... 24
Autoselect Command Sequence ............................................ 25

Table 13. Device IDs ...................................................................... 25

Program Command Sequence ............................................... 25
Unlock Bypass Command Sequence ..................................... 26

Figure 2. Erase Operation.............................................................. 26

Chip Erase Command Sequence ........................................... 26
Sector Erase Command Sequence ........................................ 27
Erase Suspend/Erase Resume Commands ........................... 27

Figure 3. Program Operation ......................................................... 28

Command Definitions ............................................................. 29

Table 14. Command Definitions .................................................... 29

Write Operation Status . . . . . . . . . . . . . . . . . . . . 30

DQ7: Data# Polling ................................................................. 30

Figure 4. Data# Polling Algorithm .................................................. 30

RDY: Ready ............................................................................ 31
DQ6: Toggle Bit I .................................................................... 31

Figure 5. Toggle Bit Algorithm........................................................ 31

DQ2: Toggle Bit II ................................................................... 31

Table 15. DQ6 and DQ2 Indications .............................................. 32

Reading Toggle Bits DQ6/DQ2 ............................................... 32
DQ5: Exceeded Timing Limits ................................................ 32
DQ3: Sector Erase Timer ....................................................... 33

Table 16. Write Operation Status ................................................... 33

Absolute Maximum Ratings . . . . . . . . . . . . . . . . 34

Figure 6. Maximum Negative Overshoot Waveform ...................... 34
Figure 7. Maximum Positive Overshoot Waveform........................ 34

Operating Ranges . . . . . . . . . . . . . . . . . . . . . . . . . 34
DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 35
Test Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 8. Test Setup....................................................................... 36
Table 17. Test Specifications ......................................................... 36

Key to Switching Waveforms. . . . . . . . . . . . . . . . 36
Switching Waveforms. . . . . . . . . . . . . . . . . . . . . . 36

Figure 9. Input Waveforms and Measurement Levels ................... 36

AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 37

VCC and VIO Power-up .......................................................... 37

Figure 10. V

and V

Power-up Diagram ................................... 37

AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 38

Synchronous/Burst Read ........................................................ 38

Figure 11. CLK Synchronous Burst Mode Read
(rising active CLK).......................................................................... 39
Figure 12. CLK Synchronous Burst Mode Read
(Falling Active Clock) ..................................................................... 40
Figure 13. Synchronous Burst Mode Read .................................... 41
Figure 14. 8-word Linear Burst with Wrap Around ......................... 41
Figure 15. Burst with RDY Set One Cycle Before Data ................. 42
Figure 16. Reduced Wait-State Handshaking Burst Mode Read
Starting at an Even Address .......................................................... 43
Figure 17. Reduced Wait-State Handshaking Burst Mode Read
Starting at an Odd Address............................................................ 44

Asynchronous Read ............................................................... 45

Figure 18. Asynchronous Mode Read with Latched Addresses .... 45
Figure 19. Asynchronous Mode Read............................................ 46
Figure 20. Reset Timings ............................................................... 47

Erase/Program Operations ..................................................... 48

Figure 21. Asynchronous Program Operation Timings .................. 49
Figure 22. Alternate Asynchronous Program Operation Timings... 50

Document Outline

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Document Outline

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: Am29BDS640GTD8WSI