
Micrel, Inc.
KSZ8851SNL/SNLI
August 2009
65
M9999-083109-2.0
Bit
Default
R/W
Description
Bit is same as:
13
0
RO
Remote fault
Not supported.
12-11
0x0
RO
Reserved
10
0
RO
Pause
Link partner pause capability.
Bit 4 in P1SR
9
0
RO
Reserved.
8
0
RO
Adv 100 Full
Link partner 100 full capability.
Bit 3 in P1SR
7
0
RO
Adv 100 Half
Link partner 100 half capability.
Bit 2 in P1SR
6
0
RO
Adv 10 Full
Link partner 10 full capability.
Bit 1 in P1SR
5
0
RO
Adv 10 Half
Link partner 10 half capability.
Bit 0 in P1SR
4-0
0x01
RO
Reserved
0xF0 – 0xF3: Reserved
Port 1 PHY Special Control/Status, LinkMD (0xF4 – 0xF5): P1SCLMD
This register contains the special control, status and LinkMD information of PHY1.
Bit
Default
R/W
Description
Bit is same as:
15
0
RO
Reserved
14-13
0x0
RO
Vct_result
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.
12
0
RW
(Self-
Clear)
Vct_en
Vct enable.
1 = the cable diagnostic test is enabled. It is self-cleared
after the VCT test is done.
0 = it indicates the cable diagnostic test is completed and
the status information is valid for read.
11
0
RW
Force_lnk
Force link.
1 = force link pass; 0 = normal operation.
10
0
RO
Reserved
9
0
RW
Remote (Near-end) loopback (rlb)
1 = perform remote loopback at PHY (RXP/RXM ->
TXP/TXM, see Figure 14)
0 = normal operation
8-0
0x000
RO
Vct_fault_count
VCT fault count.
Distance to the fault. It’s approximately
0.4m*vct_fault_count.