ML628 IBERT Getting Started Guide
19
UG806 (v1.0) May 20, 2011
Running the GTH IBERT Demonstration
In Case of RX Bit Errors
If after the
Reset All
button (
) has been pressed the
RX Bit Error Count
for one
or more Quads displays a non-zero value, click the respective BERT
Reset
button
(
) to zero the count.
If RX bit errors persist after clicking the BERT
Reset
buttons, additional tuning of the
transceivers might be required and/or one or more DC blocks might need to be installed in
line with the loopback cables. See
for installation instructions.
DC Blocks
The GTH receiver analog front end (AFE) does not support DC coupling (see
,
Virtex-6 FPGA GTH Transceivers User Guide
for details). For this reason, a DC component in
X-Ref Target - Figure 1-19
Figure 1-19:
GTH IBERT Console
u
g
8
06_c1_19_050411
X-Ref Target - Figure 1-20
Figure 1-20:
Resetting the RX Bit Error Count
UG
8
06_c1_20_041411
