Datasheet

DP83849IF

www.ti.com

SNOSAX8D –JUNE 2009–REVISED APRIL 2013

10.3.4 TDR Window Register (TDR_WIN), Page 2, address 17h

This register contains sample window control for the Time Domain Reflectometry (TDR) cable diagnostics.

The two values contained in this register specify the beginning and end times for the window to monitor

the response to the transmitted pulse. Time values are in 8ns increments. This provides a method to

search for multiple responses and also to screen out the initial outgoing pulse.

Table 10-29. TDR Window Register (TDR_WIN), address 17h

Bit Bit Name Default Description

15:8 TDR_START 0, RW TDR Start Window:

Specifies start time for monitoring TDR response.

7:0 TDR_STOP 0xFF, RW TDR Stop Window:

Specifies stop time for monitoring TDR response. The Stop Window

should be set to a value greater than or equal to the Start Window.

10.3.5 TDR Peak Register (TDR_PEAK), Page 2, address 18h

This register contains the results of the TDR Peak Detection. Results are valid if the TDR_CTRL[11] is

clear following sending the TDR pulse.

Table 10-30. TDR Peak Register (TDR_PEAK), address 18h

Bit Bit Name Default Description

15:14 RESERVED 0, RO RESERVED: Writes ignored, read as 0.

13:8 TDR_PEAK 0, RO TDR Peak Value:

This register contains the peak value measured during the TDR sample

window. If Min Mode control (TDR_CTRL[7]) is 0, this contains the

maximum detected value. If Min Mode control is 1, this contains the

minimum detected value.

7:0 TDR_PEAK_TIME 0, RO TDR Peak Time:

Specifies the time for the first occurrence of the peak value.

10.3.6 TDR Threshold Register (TDR_THR), Page 2, address 19h

This register contains the results of the TDR Threshold Detection. Results are valid if the TDR_CTRL[11]

is clear following sending the TDR pulse.

Table 10-31. TDR Threshold Register (TDR_THR), address 19h

Bit Bit Name Default Description

15:9 RESERVED 0, RO RESERVED: Writes ignored, read as 0.

8 TDR_THR_MET 0, RO TDR Threshold Met:

This bit indicates the TDR threshold was met during the sample window. A

value of 0 indicates the threshold was not met.

7:0 TDR_THR_TIME 0, RO TDR Threshold Time:

Specifies the time for the first data that met the TDR threshold. This field is

only valid if the threshold was met.

Submit Documentation Feedback

Product Folder Links: DP83849IF