Datasheet

Micrel, Inc. KS8999
January 2005
14
KS8999
I/O Grouping
Group Name Description
PHY Physical Interface
MII Media Independent Interface
SNI Serial Network Interface
IND LED Indicators
UP Unmanaged Programmable
CTRL Control and Miscellaneous
TEST Test (Factory)
PWR Power and Ground
I/O Descriptions
Group I/O Names Active Status Description
PHY
RXP[1:8]
RXM[1:8]
Analog
Differential inputs (receive) for connection to media (transformer or fiber
module)
TXP[1:8]
TXM[1:8]
Analog
Differential outputs (transmit) for connection to media (transformer or fiber
module)
FXSD[1:8] H
Fiber signal detect –connect to fiber signal detect output on fiber module with
appropriate voltage divider if needed. Tie low for copper mode.
ISET Analog
Transmit Current Set. Connecting an external reference resistor to set
transmitter output current. This pin connects to a 3KΩ1% resistor to ground if
a transformer with 1:1 turn ratio is used.
MII MRXD[0:3] H Four bit wide data bus for receiving MAC frames
MRXDV H Receive data valid
MCOL H Receive collision detection
MCRS H Carrier sense
MTXD[0:3] H Four bit wide data bus for transmitting MAC frames
MTXEN H Transmit enable
MTXER H Transmit error
MRXC Clock MII receive clock
MTXC Clock MII transmit clock
SNI MTXD[0] H Serial transmit data
MTXEN H Transmit enable
MRXD[0] H Serial receive data
MRXDV H Receive carrier sense/data valid
MCOL H Collision detection
MRXC Clock SNI receive clock
MTXC Clock SNI transmit clock
IND LED[1:9][0] L Output (after reset)
Mode 0: Speed (on = 100/off = 10)
Mode 1: 10/100 + link + activity
10Mb link activity = slow blink (non-periodic blinking)
100Mb link activity = fast blink (non-periodic blinking)
Mode 2: Collision (on = collision/off = no collision)
Mode 3: Speed (on = 100/off = 10)
LED[1:9][1] L Output (after reset)
Mode 0: Full Duplex (on = full/off = half)
Mode 1: Full Duplex (on = full/off = half)
Mode 2: Full Duplex (on = full/off = half)
Mode 3: Reserved