
Micrel, Inc.
KSZ8842-PMQL/PMBL
October 2007
81
M9999-100207-1.5
Bit
Default
R/W
Description
1011 = 48 Mbps
1100 = 64 Mbps
1101 = 72 Mbps
1110 = 80 Mbps
1111 = 88 Mbps
Note: For 10Base-T, rate settings above 10Mbps are set to the default
value 0000 (Not limited).
Note: When multiple queue select enable is off (only 1 queue per port),
rate limiting applies only to priority 0 queue.
Port 1 PHY Special Control/Status, LinkMD (Offset 0x0510): P1SCSLMD
This register contains the port LinkMD control register for the switch port 1 function.
Bit
Default
R/W
Description
Is the same as:
15
0
RO
Vct 10M short
Less than 10 meter short
P1VCT, bit 12
14 – 13
0
RO
Vct result
[00] = normal condition
[01] = open condition has been detected in cable
[10] = short condition has been detected in cable
[11] = cable diagnostic test is failed
P1VCT, bits 14-13
12
0
RW
SC
Vct enable
1 = the cable diagnostic test is enabled. It’ll be self-
cleared after VCT test is done
0 = it indicates the cable diagnostic test is
completed and the status information is valid for
read
P1VCT, bit 15
11
0
RW
Force Link
1 = Force link pass
0 = Normal Operation
P1PHYCTRL,
bit 3
10
1
RW
Power Saving
1 = Disable
0 = Enable power saving
P1PHYCTRL,
bit 2
9
0
RW
Remote loop back
1 = Loop back at PMD/PMA of port 1’s PHY
0 = normal operation.
P1PHYCTRL,
bit 1
8 – 0
0x000
RO
VCT fault count
Distance to the fault. The distance is approximately
0.4mXvct_fault_count
P1VCT, bits 8-0