ADM7008
Function Description
HALF
FULL
LOW All the Time
HIGH All the Time
LINK UP
LINK FAIL
Blink (HIGH) When Collision
HIGH All the Time
Table 3-5 Duplex LED Display
Link/Activity
SPEED
Link
LOW
HIGH All the Time
Activity
LINK UP
LINK FAIL
Blink (HIGH) When RX/TX
HIGH All the Time
Table 3-6 Activity/Link LED Display
Blinking time is programmed through BLINK_TM[1:0] in register 19 bit 13 to 12.
Combined with detected speed within each port, different blinking time will be
determined and this different blinking time can be used to distinguish the speed.
Blinking time is summarized in Table 3-7.
Blinking Time
BLINK_TM
10M
100M
100 ms
100 ms
100 ms
50 ms
00
01
10
11
100 ms
200 ms
400 ms
100 ms
Table 3-7 Different Blinking Time for Different Speed
Besides duplex, speed, link and activity status, ADM7008 also provides cable
information that can be shown on LEDs when register 19 is programmed to distance LED
display (see Table 3-8).
LNKACT
DUPCOL
LEDSPD
Cable Distance
0 to 40 meters
40 to 80 meters
80 to 120 meters
Cable Broken
1
1
0
1
1
0
0
1
0
0
0
1
Table 3-8 Cable Distance LED Display
ADMtek Inc.
3-22
ETC [ ETC ]
