TLK105 Datasheet, PDF (69/99 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer Transceiver

TLK105
TLK106
www.ti.com
SLLSEB8A – AUGUST 2012 – REVISED MARCH 2013
Table 8-36. Cable Diagnostic Specific Control Register (CDSCR), address 0x0170 (continued)
BIT
BIT NAME
14 Diagnostic Cross
Disable
13 Diagnostic TPTD
Bypass
12 Diagnostic TPRD
Bypass
11 RESERVED
10:8 Diagnostics Average
Cycles
7:0 RESERVED
DEFAULT
0,RW
0,RW
0,RO
1,RW
<110>,RW
0,RO
DESCRIPTION
Cross TDR Diagnostic mode
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.
TPTD Diagnostic 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.
TPRD Diagnostic Bypass
1 = Bypass TPRD diagnostic. TDR on TPRD pair will not be executed.
0 = TDR is executed on TPRD pair
RESERVED: Must be Set to 1.
Number Of TDR Cycles to Average:
<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
RESERVED: Writes ignored, read as 0.
Table 8-37. Cable Diagnostic Specific Control Register 2 (CDSCR2), address 0x0171
BIT
BIT NAME
15:4 RESERVED
3:0 TDR pulse control
DEFAULT
DESCRIPTION
<1100 1000 RESERVED: Ignore on read
0101>, RW
<0001>, Configure expected self reflection in TDR
RW
Table 8-38. Cable Diagnostic Specific Control Register 3 (CDSCR3), address 0x0173
BIT
BIT NAME
15:8 Cable length cfg
7:0 RESERVED
DEFAULT
DESCRIPTION
<1010 Configure duration of listening to detect long cable reflections
0000>, RW
<0001 RESERVED: Ignore on read
1110>, RW
Table 8-39. Cable Diagnostic Specific Control Register 4 (CDSCR4), address 0x0177
BIT
BIT NAME
15:13 RESERVED
12:8 Short cables TH
7:0 RESERVED
DEFAULT
DESCRIPTION
<000>, RW RESERVED: Ignore on read
<0 1101>, TH to compensate for strong reflections in short cables
RW
<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
15:8 TPTD Peak
Location 2
DEFAULT
<0000 0000>, RO
FUNCTION
Location of the Second peak discovered by the TDR mechanism on Transmit Channel
(TPTD). The value of these bits is translated into distance from the PHY
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