When running timing analyzer on a virtex design using block ram, the
block ram elements are not displayed under Custom Filters in the RAM
element type. However, the SelectRam elements are available. From
the timing analyzer, Path Filters --> Custom Filters --> Select Sources or
Select Destinations will bring up the Select Sources/Destinations dialog
box. However, if RAMs is chosen as the Source Element Type, only the
SelectRAM elements are available. Any Block RAM elements do not
While M1.5i does not include this, a workaround exists in software release
M2.1i. The Block Ram elements can be included in analysis if they are
assigned a TimeGroup name.
1. Then from the Timing Analyzer, select: Path Filters --> Custom Filters -->
Select Sources / Destinations will bring up the Select Sources/
Destinations dialog box.
2. From the drop down menu Source / Destination Element Types,
3. The TimeGroup that was created for the Block Rams is now
available for selection and analysis.