1
Micrel Semiconductor
TEL:
1.800.401.9572
FAX:
1.408.474.0159
HTTP://
www.micrel.com
Physical
Transceiver
1
MAC
1
Look Up
Engine
(1K Entries)
SRAM
Buffers
(32Kx32)
MII / SNI
(exclusive)
External
Interface
Physical
Transceiver
2
MAC
2
Physical
Transceiver
3
MAC
3
Physical
Transceiver
4
MAC
4
Physical
Transceiver
5
MAC
5
FIFO and Flow Control
Queue
Management
Buffer
Management
LED
and
Programming
Interface
MRXD[3:0]
MRXDV
MCOL
MTXD[3:0]
MTXEN
MTXER
MII_CLK
R
X
P
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1
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R
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M
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1
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3
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4
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5
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T
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LED[1][3:0]
LED[2][3:0]
LED[3][3:0]
LED[4][3:0]
LED[5][3:0]
MRXD[0]
MRXDV
MCOL
MTXD[0]
MTXEN
MII_CLK
S
N
I
M
I
I
EEPROM
Interface
SCL
SDA
KS8995E Product Brief
Revision 1.0
5-Port 10/100 Integrated Switch with PHY and
Frame Buffers
The KS8995E contains five 10/100 physical layer
transceivers, five MAC (Media Access Control) units with
an integrated layer 2 switch. The device runs in two
modes. The first mode is a five port integrated switch
and the second is as a five port switch with the fifth port
decoupled from the physical port. In this mode access to
the fifth MAC is provided using a MII (Media
Independent Interface).
Useful configurations include a stand alone five port
switch as well as a four port switch with a routing element
connected to the extra MII port. The additional port is
also useful for public network interfacing.
The KS8995E is designed to reside in an unmanaged
design not requiring processor intervention. This is
achieved through I/O strapping or EEPROM
programming at system reset time.
Block Diagram
On the media side, the KS8995E supports 10BaseT,
100BaseTX and 100BaseFX as specified by the IEEE
802.3 committee.
Physical signal transmission and reception are
enhanced through use of analog circuitry that makes the
design more efficient and allows for lower power
consumption and smaller chip die size.
The major enhancements from the KS8995 to the
KS8995E are support for VLAN, traffic priority queuing,
EEPROM programming for expanded control and MDI/
MDI-X auto crossover.
Micrel Semiconductor
TEL:
1.800.401.9572
FAX:
1.408.474.0159
HTTP://
www.micrel.com
2
System Level Applications
The KS8995E can be configured to fit either in a
five port 10/100 application or as a four port 10/100
network interface with an extra MII/SNI port. This MII/
SNI port can be connected to an external processor and
used for routing purposes or public network access. The
major benefits of using the KS8995E are the lower power
consumption, unmanaged operation, flexible
configuration, built in frame buffering, VLAN abilities
and traffic priority control. Two such applications are
depicted below.
STOCK NO. M-1007
Features
5-port 10/100 integrated switch with physical layer
transceivers
SRAM on-chip for frame buffering
1.4Gbps high performance memory bandwidth
10BaseT, 100BaseTX and 100BaseFX modes of
operation
Superior analog technology for reduced power and die
size
Single 2.5V power supply
500mA (1.25W) including physical transmit drivers
128-pin PQFP package
Supports port-based VLAN
Supports DiffServ priority, 802.1p-based priority or port-
based priority
Support for UTP or fiber installations
Indicators for link, activity, full/half-duplex and
speed
Unmanaged operation via strapping or EEPROM at
system reset time
Hardware based 10/100, full/half, flow control and auto-
negotiation
Individual port forced modes (full-duplex, 100BaseTX)
when auto-negotiation is disabled
Integrated address look-up engine, supports 1K
absolute MAC addresses
Automatic address learning, address aging and address
migration
Broadcast storm protection
Full-duplex IEEE 802.3x flow control
Half-duplex back pressure flow control
Comprehensive LED support
External MAC interface (MII or SNI) for router
Supports MDI/MDI-X auto crossover
Contact Micrel Semiconductor
Location
Address
Telephone
Fax
Corporate HQ
1849 Fortune Drive
San Jose, CA 95131 USA
+1 (408) 944-0800
+1-408-944-0970
Eastern USA
93 Branch Street
Medford, NJ 08055 USA
+1 (609) 654-0078
+1 (609) 546-0989
Southeast USA
8105 Bluffridge Drive
Raleigh, NC 27615 USA
+1 (919) 870-7650
+1 (919) 870-7651
Central USA
722 S. Denton Tap Suite 130
Coppell, TX 75019 USA
+1 (972) 393-2533
+1 (972) 393-2540
Western USA
2180 Fortune Drive
San Jose, CA 95131 USA
+1 (408) 944-0800
+1-408-944-0970
Northwest USA
401 NE Ravenna Blvd. Box 152
Seattle, WA 98115 USA
+1 (206) 526-7299
+1 (206) 526-8829
Southwest USA
7545 Irvine Center Dr. Suite 200
Irvine, CA 92618 USA
+1 (949) 623-8343
+1 (949) 623-8305
Korea
4F, KTB Building, 826-14, Yeoksam-dong, Kangnam-ku
Seoul 135-080 Korea
+82 (2) 3466-3000
+82 (2) 3466-2999
Taiwan
7F-6, No. 237, Sec. 2, Fu-Hsing South Road
Taipei, Taiwan, R.O.C.
+886 (2) 2705-4976
+886 (2) 2705-4977
China
12A, XingHao City Garden
Shenzhen, P.R. China
+86 (755) 2693-4601
Japan
1-16-15 Dogenzaka, Shibuyaku
Tokyo 150-0043 Japan
+81 (3) 5428-0871
+81 (3) 5428-0872
Europe
1st Floor, 3 Lockside Place, Mill Lane
Newbury, Berks RG14 5QS UK
+44 1635 524455
+44 1635 524466
Western Europe
10, avenue du Quebec, Villebon BP116
Courtaboeuf Cedex 91944 France
+33 (0) 1 6092 4189
+33 (0) 6 0868 4489
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