KS8893ML datasheet(53/106 Pages) MICREL

53 / 106 page

Micrel

KS8893M/ML/MI

June 2005

M9999-063005

PHY1 Register 29 (PHYAD = 0x1, REGAD = 0x1D): LinkMD Control/Status

PHY2 Register 29 (PHYAD = 0x2, REGAD = 0x1D): LinkMD Control/Status

Bit

Name

R/W

Description

Default

Reference

Vct_enable

R/W

(SC)

1 = enable cable diagnostic. After VCT test

has completed, this bit will be self-cleared.

0 = indicate cable diagnostic test (if

enabled) has completed and the status

information is valid for read.

Reg. 26, bit 4

Reg. 42, bit 4

14-13

Vct_result

00 = normal condition

01 = open condition detected in cable

10 = short condition detected in cable

11 = cable diagnostic test has failed

Reg 26, bit[6:5]

Reg 42, bit[6:5]

Vct 10M Short

1 = Less than 10 meter short

Reg. 26, bit 7

Reg. 42, bit 7

11-9

Reserved

000

8-0

Vct_fault_count

Distance to the fault.

It’s approximately 0.4m*vct_fault_count[8:0]

{0, (0x00)}

{(Reg. 26, bit

0), (Reg. 27,

bit[7:0])}

{(Reg. 42, bit

0), (Reg. 43,

bit[7:0])}

PHY1 Register 31 (PHYAD = 0x1, REGAD = 0x1F): PHY Special Control/Status

PHY2 Register 31 (PHYAD = 0x2, REGAD = 0x1F): PHY Special Control/Status

Bit

Name

R/W

Description

Default

Reference

15-6

Reserved

{(0x00),00}

Polrvs

1 = polarity is reversed

0 = polarity is not reversed

Reg. 31, bit 5

Reg. 47, bit 5

MDI-X status

1 = MDI-X

0 = MDI

Reg. 30, bit 7

Reg. 46, bit 7

Force_lnk

R/W

1 = Force link pass

0 = Normal Operation

Reg. 26, bit 3

Reg. 42, bit 3

Pwrsave

R/W

1 = Enable power saving

0 = Disable power saving

Reg. 26, bit 2

Reg. 42, bit 2

Remote

Loopback

R/W

1 = Perform Remote loopback, as follows:

Port 1 (reg. 26, bit 1 = ‘1’)

Start: RXP1/RXM1 (port 1)

Loopback: PMD/PMA of port 1’s PHY

End: TXP1/TXM1 (port 1)

Port 2 (reg. 42, bit 1 = ‘1’)

Start: RXP2/RXM2 (port 2)

Loopback: PMD/PMA of port 2’s PHY

End: TXP2/TXM2 (port 2)

0 = Normal Operation

Reg. 26, bit 1

Reg. 42, bit 1

Reserved

R/W

Reserved

Do not change the default value.

KS8893ML Datasheet(PDF) 53 Page - Micrel Semiconductor

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