Datasheet

Micrel, Inc. KS8999
January 2005
15
KS8999
Group I/O Names Active Status Description
LED[1:9][2] L Output (after reset)
Mode 0: Collision (on = collision/off = no collision)
Mode 1: Transmit Activity (on during transmission)
Mode 2: Link activity (10Mb mode)
Mode 3: Full Duplex + Collision
(constant on = full duplex; intermittent on = collision; off = half-duplex with no
collision)
LED[1:9][3] L Output (after reset)
Mode 0: Link + Activity
When LED is solid “on”, it indicates the link is on for both 10 or 100BaseTX,
but no data is transmitting or receiving.
When LED is solid “off”, it indicates the link is off.
When LED is blinking, it indicates data is transmitting or receiving for either 10
or 100 BaseTX
Mode 1: Receive Activity (on = receiving/off = not receiving)
Mode 2: Link activity (100Mb mode)
Mode 3: Link + Activity (see description above)
Note: Mode is set by MODESEL[3:0] ; please see description in UP
(unmanaged programming) section.
UP MODESEL[3:0] H Mode select at reset time. LED mode is selected by using the table below.
Note that under normal operation MODESEL[3:2] must be tied low.
MODESEL
Mode select at reset time. LED mode is selected by using the
table below. Note that under normal operation
MODESEL[3:2] must be tied low.
3 2 1 0 Operation
0 0 0 0 LED mode 0
0 0 0 1 LED mode 1
0 0 1 0 LED mode 2
0 0 1 1 LED mode 3
0 1 0 0 Used for factory testing
0 1 0 1 Used for factory testing
0 1 1 0 Used for factory testing
0 1 1 1 Used for factory testing
1 0 0 0 Used for factory testing
1 0 0 1 Used for factory testing
1 0 1 0 Used for factory testing
1 0 1 1 Used for factory testing
1 1 0 0 Used for factory testing
1 1 0 1 Used for factory testing
1 1 1 0 Used for factory testing
1 1 1 1 Used for factory testing
LED[1][3] Programs auto-negotiation on port 1
D = Disable auto-negotiation, F/U = Enable auto-negotiation (default)
LED[1][2]
Programs auto-negotiation on port 2
D = Disable auto-negotiation, F/U = Enable auto-negotiation (default)
LED[1][1]
Programs auto-negotiation on port 3
D = Disable auto-negotiation, F/U = Enable auto-negotiation (default)
LED[1][0]
Programs auto-negotiation on port 4 D = Disable auto-negotiation,
F/U = Enable auto-negotiation (default)