486 Mercury Drive, Sunnyvale, California 94086 Tel: (408) 735-1118 Fax: (408) 735-1119 www.kendin.com
KS8995 – 5 Port 10/100 Switch with PHY
Introduction
The KS8995 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 KS8995 is designed to reside in an unmanaged
design not requiring processor intervention. This is
achieved through I/O strapping at system reset time
On the media side, the KS8995 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.
Highlights
• 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 2.5 V power supply
• 500 mA (1.25 W) including physical transmit
drivers
• 128 pin PQFP package
• Support for UTP or fiber installations
• Indicators for link, activity, full / half duplex and
speed
• Unmanaged operation via strapping 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
• Wire speed reception and transmission
• 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
applications
Physical
Transceiver
1
MAC
1
Look Up
Engine
(1K Entries)
SRAM
Buffers
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
RXP[1], RXM[1]
RXP[2], RXM[2]
RXP[3], RXM[3]
RXP[4], RXM[4]
RXP[5], RXM[5]
TXP[1], TXM[1]
TXP[2], TXM[2]
TXP[3], TXM[3]
TXP[4], TXM[4]
TXP[5], TXM[5]
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
486 Mercury Drive, Sunnyvale, California 94086 Tel: (408) 735-1118 Fax: (408) 735-1119 www.kendin.com
System Level Applications
The KS8995 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 port. This MII port can be connected to an external processor and used for routing
purposes or public network access. The major benefits of using the KS8995 are the lower power consumption,
unmanaged operation, flexible configuration and built in frame buffering. Two such applications are depicted below.
KS8995
5 Port
Switch
with
PHY
KS8995
5 Port
Switch
with
PHY
Routing
Engine
KS8995 Applications
5X
Transformer
or Fiber
Interface
4X
Transformer
or Fiber
Interface
Public
Network
Access
5 Port Stand Alone 4 Port with Public
Network Interface
Or
more information
products@kendin.com
