Answers Database
M1.xi: TRCE: IOB register to PAD paths (and vice-versa) are not reported or controlled
Record #1867
Product Family: Software
Product Line: FPGA Implementation
Product Part: trce
Product Version: 1.4
Problem Title:
M1.xi: TRCE: IOB register to PAD paths (and vice-versa) are not reported or controlled
Problem Description:
Urgency: Standard
General Description: TRACE does not report timing-related data associated with PADS and
FLIP FLOPS when the flip flop is contained (implemented) in an IOB component. This
occurs for both for explicit instantiations of IFFs and OFFs and for flip flops packed
into an IOB during the mapping process (controllable with the -pr switch).
Solution 1:
Workaround: The timing between the PAD and FF is fixed (and
known) for each device, but is not reported by TRCE. There is no known
workaround for having TRCE report these numbers, but the numbers reported in
the Data Book Guaranteed Input and Output Parameters are considered valid.
End of Record #1867 - Last Modified: 06/28/99 13:57 |
