L-ET1011C2-C-D LSI, L-ET1011C2-C-D Datasheet - Page 59

• Manufacturer Part Number: L-ET1011C2-C-D
• Manufacturer: LSI

Specifications of L-ET1011C2-C-D

• Number Of Receivers: 1
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Lead Free Status / RoHS Status: Compliant

September 2007
LSI Corporation
Register Description
Register Functions/Settings
Table 50. Diagnostics Control Register (TDR Mode)—Address 30
1. Automatic TDR analysis is enabled by setting TDR request to {11}. All 10 combinations of pairs are analyzed in sequence, and the results are available in
2. TDR transmit and receive dimensions are only valid for single-pair TDR analysis. They are ignored for automatic TDR analysis when all 10 pair combina-
3. This is the distance to an open, short, or strong impedance mismatch fault on the chosen pair for single-pair TDR analysis. For automatic TDR analysis, this
4. The 8-bit integer value can be linearly converted to distance in meters. The value 0x08 (or less) corresponds to a distance of 0 m, and the value 0xfe corre-
registers 30 and 31. TDR analysis for a single-pair combination can be enabled by setting TDR request to {10}. Diagnostics must be enabled (18.2 = 1),
cable diagnostic TDR must be mode selected (23.13 = 0), and the PHY must be in PHY standby mode (26.15 = 1) to perform TDR operations. Bit 15 self-
clears when the TDR operation is complete. When TDR is complete, bit 14 indicates whether the results are valid.
tions are analyzed.
returns the distance to the last open, short, or strong impedance mismatch fault found. The automatic algorithm searches for faults in the order of short
between C and D, B and D, B and C, A and D, A and C, A and B; and faults on pair D, pair C, pair B, and pair A. If there is no fault, the result will be 0xff
and should be ignored.
sponds to a distance of 200 m (180 m for Cat-3 cable). The following equation can be used to convert the integer value to meters:
NVP = normalized velocity of propagation (typically 0.69 for CAT5, CAT5e, and CAT6; 0.62 for CAT3). For CAT5/5e/6 cable, a simple
approximation (accurate to 0.1%) is (x – 8) x 13/16.
Where,
15:14
13:12
11:10
Bit
9:2
1:0
TDR Request
TDR Tx Dim
TDR Rx Dim
Distance to Fault
Reserved
Name
(continued)
11 = Automatic TDR analysis in progress.
10 = Single-pair TDR analysis in progress.
01 = TDR analysis complete, results valid.
00 = TDR analysis complete, results invalid.
Transmit dimension for single-pair TDR analysis.
00 = TDR transmit on pair A.
01 = TDR transmit on pair B.
10 = TDR transmit on pair C.
11 = TDR transmit on pair D.
Receive dimension for single-pair TDR analysis.
00 = TDR receive on pair A.
01 = TDR receive on pair B.
10 = TDR receive on pair C.
11 = TDR receive on pair D.
Distance to open or short fault.
(continued)
Diagnostics Control Register (TDR Mode)
distance (m) = 1.179 x (x – 8) x NVP
Description
—
Gigabit Ethernet Transceiver
Type
R/W
R/W
R/W
R/W
—
Default
00
00
00
—
0
Notes
3, 4
—
1
2
2
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