TLK105 datasheet(69/99 Pages) TI

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TLK105

TLK106

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SLLSEB8A – AUGUST 2012 – REVISED MARCH 2013

Table 8-36. Cable Diagnostic Specific Control Register (CDSCR), address 0x0170 (continued)

BIT

BIT NAME

DEFAULT

DESCRIPTION

Diagnostic Cross

0,RW

Cross TDR Diagnostic mode

Disable

1 = Disable TDR Cross mode – TDR will be executed in regular mode only

0 = Diagnostic of crossing pairs is enabled In Cross Diagnostic mode, the TDR mechanism

is looking for reflection on the other pair to check short between pairs.

Diagnostic TPTD

0,RW

TPTD Diagnostic Bypass

Bypass

1 = Bypass TPTD diagnostic. TDR on TPTD pair will not be executed.

0 = TDR is executed on TPTD pair

In bypass TPTD, results are available in TPRD slots.

Diagnostic TPRD

0,RO

TPRD Diagnostic Bypass

Bypass

1 = Bypass TPRD diagnostic. TDR on TPRD pair will not be executed.

0 = TDR is executed on TPRD pair

RESERVED

1,RW

RESERVED: Must be Set to 1.

10:8

Diagnostics Average

<110>,RW

Number Of TDR Cycles to Average:

Cycles

<000>: 1 TDR cycle

<001>: 2 TDR cycles

<010>: 4 TDR cycles

<011>: 8 TDR cycles

<100>: 16 TDR cycles

<101>: 32 TDR cycles

<110>: 64 TDR cycles (default)

<111>: Reserved

7:0

RESERVED

0,RO

RESERVED: Writes ignored, read as 0.

Table 8-37. Cable Diagnostic Specific Control Register 2 (CDSCR2), address 0x0171

BIT

BIT NAME

DEFAULT

DESCRIPTION

15:4

RESERVED

<1100 1000 RESERVED: Ignore on read

0101>, RW

3:0

TDR pulse control

<0001>,

Configure expected self reflection in TDR

Table 8-38. Cable Diagnostic Specific Control Register 3 (CDSCR3), address 0x0173

BIT

BIT NAME

DEFAULT

DESCRIPTION

15:8

Cable length cfg

<1010

Configure duration of listening to detect long cable reflections

0000>, RW

7:0

RESERVED

<0001

RESERVED: Ignore on read

1110>, RW

Table 8-39. Cable Diagnostic Specific Control Register 4 (CDSCR4), address 0x0177

BIT

BIT NAME

DEFAULT

DESCRIPTION

15:13

RESERVED

<000>, RW

RESERVED: Ignore on read

12:8

Short cables TH

<0 1101>,

TH to compensate for strong reflections in short cables

7:0

RESERVED

<1001

RESERVED: Ignore on read

0110>, RW

8.20.3 Cable Diagnostic Location Results Register 1 (CDLRR1)

This register provides the peaks locations after execution of the TDR. The values of this register are valid

after reading 1 in Diagnostic Done bit 1 in register CDCR (0x1E).

Table 8-40. Cable Diagnostic Location Results Register 1 (CDLRR1), address 0x0180

BIT

NAME

DEFAULT

FUNCTION

15:8

TPTD Peak

<0000 0000>, RO

Location of the Second peak discovered by the TDR mechanism on Transmit Channel

Location 2

(TPTD). The value of these bits is translated into distance from the PHY

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