82596DX Datasheet, PDF (48/77 Pages) Intel Corporation – HIGH-PERFORMANCE 32-BIT LOCAL AREA NETWORK COPROCESSOR

82596DX SX
The format of the Time Domain Reflectometer command is
82586 and 32-Bit Segmented Modes
31
ODD WORD
16 15
EVEN WORD
0
EL S I X X X X X X X X X X 1 0 1 C B OK 0 0 0 0 0 0 0 0 0 0 0 0 0
LNK XVR ET ET X
TIME
A15
LINK OFFSET
A0
OK PRB OPN SRT
(11 bits)
Linear Mode
31
ODD WORD
16 15
EVEN WORD
0
EL S I 0 0 0 0 0 0 0 0 0 0 1 0 1 C B OK 0 0 0 0 0 0 0 0 0 0 0 0 0
A31
LINK ADDRESS
A0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 LNK XVR ET ET X
OK PRB OPN SRT
TIME
(11 bits)
Figure 32 TDR
where
LINK ADDRESS
EL B C I S
A
Bits 19–28
CMD (Bits 16–18)
TIME
LNK OK (Bit 15)
XCVR PRB (Bit 14)
ET OPN (Bit 13)
ET SRT (Bit 12)
As per standard Command Block (see the NOP command for details)
Indicates that the command was abnormally terminated due to CU Abort control
command If one then the command was aborted and if necessary it should be
repeated If this bit is zero the command was not aborted
Reserved (0 in the 32-bit Segmented and Linear Modes)
The TDR command Value 5h
An 11-bit field that specifies the number of TxC cycles that elapsed before an echo
was observed No echo is indicated by a reception consisting of ‘‘1s’’ only Be-
cause the network contains various elements such as transceiver links transceiv-
ers Ethernet repeaters etc the TIME is not exactly proportional to the problems
distance
No link problem identified TIME^e7FFh
Indicates a Transceiver problem Carrier Sense was inactive for 2048-bit time peri-
od LNK OK^e0 TIME^e7FFh
The transmission line is not properly terminated Collision Detect went active and
LNK OK^e0
There is a short circuit on the transmission line Carrier Sense Signal dropped and
LNK OK^e0
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