AR# 53061
14.3 EDK, DDRx - "ERROR: tCK(avg) maximum violation by 33.335938 ps"
Description
If I am simulating XPS Base System Builder designs containing the AXI DDR IP, tck error messages similar to the following occur on the simulator console:
"system_tb.inst_ddr_00.main: at time 76820837.0 ps ERROR: tCK(avg) maximum violation by 33.335938 ps"
How can I fix this?
Solution
This error occurs if the clock frequency driving the DDR3 device is lower than the DDR3 JEDEC specification value of 303 MHz:
ddr3_jedec_spec.jpg
In many of the Base System Builder projects, this will be set to 300 MHz, causing a mismatch that leads to tck errors.
This can be ignored in the simulation since the IP allows for this margin.
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| AR# 53061 | |
|---|---|
| Date | 11/26/2012 |
| Status | Active |
| Type | General Article |
| Tools | |
| IP | |