
Micrel, Inc.
KSZ8841-PMQL
October 2007
60
M9999-100407-1.5
Bit
Default
R/W
Description
Is the Same as
9
0
RW
Remote loopback
1 = Loop back at PMD/PMA of port’s PHY
(RXP1/RXM1 -> TXP1/TXM1)
0 = Normal operation.
P1PHYCTRL, bit 1
8-0
0x000
RO
VCT fault count
Distance to the fault. The distance is
approximately 0.4m X vct_fault_count
P1VCT, bits 8-0
Port 1 Control Register 4 (Offset 0x0512): P1CR4
This register contains the global per port control for the chip function.
Bit
Default
R/W
Description
Is the Same as
15
0
RW
LED off
1 = Turn off all port’s LEDs (LED1_3,
LED1_2, LED1_1, LED1_0. These pins will
be driven high if this bit is set to one
0 = Normal operation
P1MBCR, bit 0
14
0
RW
Txids
1 = Disable port’s transmitter
0 = Normal operation
P1MBCR, bit 1
13
0
RW
Restart AN
1 = Restart auto-negotiation
0 = Normal operation
P1MBCR, 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.
P1MBCR, bit 2
11
0
RW
Power down
1 = Power down
0 = Normal operation
P1MBCR, bit 11
10
0
RW
Disable auto MDI/MDIX
1 = Disable auto MDI/MDIX function
0 = Enable auto MDI/MDIX function
P1MBCR, bit 3
9
0
RW
Force MDIX
1 = If auto MDI/MDIX is disabled, force PHY
into MDIX mode
0 = Do not force PHY into MDIX mode
P1MBCR, bit 4
8
0
Reserved
P1MBCR, bit 14
7
1
RW
Auto Negotiation Enable
1 = Auto negotiation is enable
0 = Disable auto negotiation, speed and
duplex are decided by bit 6 and 5 of the
same register.
P1MBCR, bit 12
6
0
RW
Force Speed
1 = Force 100BT if AN is disabled (bit 7)
P1MBCR, bit 13