I347-AT4 Datasheet, PDF (62/148 Pages) Intel Corporation – Intel® Ethernet Network Connection I347-AT4 Datasheet

I347-AT4—Device Functionality
Columns 2 to 5 lists the behavior when both the transmitter and receiver are running
the EXTEST_TRAIN and EXTEST_PULSE commands. Column 2 shows the expected
value captured by the boundary scan cell that is connected to the test receiver, which is
connected to the positive input when a negative differential pulse is transmitted.
Column 3 is the same as column 2 except for the negative input. Columns 4 and 5 are
similar to columns 2 and 3 except a positive differential pulse is transmitted.
Columns 6 to 9 is similar to columns 2 to 5 except both the transmitter and receiver are
running the (DC) EXTEST command.
While it is not possible to identify precisely which fault is occurring based on the fault
signature, the signature to the no fault condition is unique when the (DC) EXTEST
command is run with at least one of the EXTEST_TRAIN, or EXTEST_PULSE commands.
Note that running only AC JTAG commands is not sufficient since the no fault condition
signature is not distinguishable from the TX to RX short (see shaded cells in Table 27).
Table 27. AC Coupled Connection Fault Signature
DC Coupled
Fault
AC Testing
Sample 0
Positive
Leg
Negative
Leg
AC Testing
Sample 1
Positive
Leg
Negative
Leg
(DC) EXTEST
Sample 0
Positive
Leg
Negative
Leg
(DC) EXTEST
Sample 1
Positive
Leg
Negative
Leg
TX+ Open
0b
X
0b
X
1b
X
1b
X
TX- Open
X
0b
X
0b
X
1b
X
1b
RX+ Open
0b
X
0b
X
1b
X
1b
X
RX- Open
X
0b
X
0b
X
1b
X
1b
TX+ short to
power
0b¹
X
0b¹
X
1b
X
1b
X
TX- short to
power
X
0b¹
X
0b¹
X
1b
X
1b
RX+ short to
power
0b¹
X
0b¹
X
1b
X
1b
X
RX- short to
power
X
0b¹
X
0b¹
X
1b
X
1b
TX+ short to
ground
0b
X
0b
X
1b
X
1b
X
TX- short to
ground
X
0b
X
0b
X
1b
X
1b
RX+ short to
ground
0b
X
0b
X
0b
X
0b
X
RX- short to
ground
X
0b
X
0b
X
0b
X
0b
TX+ short to
2
TX-
2
2
2
1b
1b
1b
1b
RX+ short to
2
RX-
2
2
2
1b
1b
1b
1b
TX+ short to
RX-
X
0b
X
1b
X
0b
X
1b
52