TLK105_16 Datasheet, PDF (71/104 Pages) Texas Instruments – TLK105 TLK106 Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer

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TLK105
TLK106
SLLSEB8C – AUGUST 2012 – REVISED APRIL 2016
8.8.2 Cable Diagnostic Specific Control Registers (CDSCR1 - CDSCR4)
Use CDSCR1 to select the channel for the cable diagnostics test. CDSCR1 contains the enable and
bypass bits for the diagnostic tests, and defines the number of executed and averaged TDR sequences.
CDSCR2 - CDSCR4 configure other parameters for cable diagnostics.
Table 8-37. Cable Diagnostic Specific Control Register (CDSCR), address 0x0170
BIT
BIT NAME
15 RESERVED
14 Diagnostic Cross
Disable
13 Diagnostic TPTD
Bypass
12 Diagnostic TPRD
Bypass
11 RESERVED
10:8 Diagnostics Average
Cycles
7:0 RESERVED
DEFAULT
0, RO
0, RW
0, RW
0, RO
1, RW
110, RW
0, RO
DESCRIPTION
RESERVED: Writes ignored, read as 0.
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 8-38. Cable Diagnostic Specific Control Register 2 (CDSCR2), address 0x0171
BIT
BIT NAME
15:4 RESERVED
3:0 TDR pulse control
DEFAULT
1100 1000
0101, RW
1100, RW
RESERVED: Ignore on read
DESCRIPTION
Configure expected self reflection in TDR
Table 8-39. Cable Diagnostic Specific Control Register 3 (CDSCR3), address 0x0173
BIT
BIT NAME
15:8 Cable length cfg
7:0 RESERVED
DEFAULT
1111 1111,
RW
1111 1111,
RW
DESCRIPTION
Configure duration of listening to detect long cable reflections
RESERVED: Ignore on read
Table 8-40. 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
1 1000, RW TH to compensate for strong reflections in short cables
1001 0110, RESERVED: Ignore on read
RW
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