
Micrel, Inc.
KSZ8842-PMQL/PMBL
October 2007
92
M9999-100207-1.5
Port 2 PHY Special Control/Status, LinkMD (Offset 0x0530): P2SCSLMD
This register contains the port 2 LinkMD control register for the switch port 2 function.
Bit
Default
R/W
Description
Is the same as:
15
0
RO
Vct 10M short
Less than 10 meter short
P2VCT, 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
P2VCT, bits 14-13
12
0
RW
SC
(self-
clear)
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
P2VCT, bit 15
11
0
RW
Force Link
1 = Force link pass
0 = Normal Operation
P2PHYCTRL,
bit 3
10
1
RW
Power Saving
1 = Disable
0 = Enable power saving
P2PHYCTRL,
bit 2
9
0
RW
Remote loop back >>
1 = Loop back at PMD/PMA of port 2’s PHY
End: TXP2/TXM2 (port 2)
0 = normal operation.
P2PHYCTRL,
bit 1
8 – 0
0
RO
VCT fault count
Distance to the fault. It’s approximately
0.4m*vct_fault_count
P2VCT, bits 8-0
Port 2 Control Register 4 (Offset 0x0532): P2CR4
This register contains the global per port control for the switch port 2 function.
Bit
Default
R/W
Description
Is the same as:
15
0
RW
LED off
1 = Turn off all port 2’s LEDs (LED2_3, LED2_2,
LED2_1, LED2_0. These pin/balls will be driven high
if this bit is set to one.
0 = normal operation
P2MBCR, bit 0
14
0
RW
Txids
1 = disable port’s transmitter
0 = normal operation
P2MBCR, bit 1
13
0
RW
Restart AN
1 = restart auto-negotiation
0 = normal operation
P2MBCR, bit 9
12
0
RW
Disable Far end fault
1 = disable far end fault detection & pattern
transmission.
0 = enable far end fault detection & pattern
transmission.
P2MBCR, bit 2