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Keysight Technologies
Modifying DDR Libraries for
Silicon Nail Test Generation on
the x1149 Boundary Scan Analyzer
Application Note
The DDR libraries available are written with the assumption that all the pins are connected to a boundary scan
cell. In a real board application however, there are pins that are not connected to boundary scan cells, in which
case we will need to modify the DDR library to generate the silicon nail test.
Here are the step-by-step procedures on DDR library modification and silicon nail test generation.
1. When silicon nail test is not generated
during the Keysight Technologies, Inc.
x1149 test:
2. Check the output message:
The output message shows that the following nodes "MQ0_SDR0_DM" and
"MQ0_SDR0_ZQ" are not connected to a boundary scan cell or resource.
3. Check the board details to find out if the
"MQ0_SDR0_DM" and "MQ0_SDR0_
ZQ" are connected to a DDR and the
boundary scan device pins.
4. The node "MQ0_SDR0_DM" in the node list shows the DDR pins D03 and E07 are shorted and connected to resistor
"R981" and the pull down is set to "GND".
5. Do the same for the other node "MQ0_SDR0_ZQ", which is connected to resistor "R971", with the pull down set to
"GND".
6. The nodes "MQ0_SDR0_DM" and "MQ0_SDR0_ZQ" are not connected to any boundary scan cell or resource. This is
the reason why the silicon nail test could not be generated.
2
7. In order to generate the silicon nail test
for the u901 DDR3, the DDR3 library has
to be modified as follows:
7.1 Change the pin usage of the group
DM (u901.E07 and u901.D03) and ZQ
(U901.L08) from inputs to non-digital.
7.2 Comment the vector where the DM
and ZQ are declared.
8. Once the DDR3 library has been
modified, regenerate the silicon nail test.
3
04 | Keysight | Modifying DDR Libraries for Silicon Nail Test Generation on the x1149 Boundary Scan Analyzer - Application Note
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