Answers Database

M1.5 TRCE: IOB register to PAD paths (and vice-versa) are not reported or controlled


Record #1867

Product Family:  Software

Product Line:  FPGA Implementation

Problem Title:
M1.5 TRCE: IOB register to PAD paths (and vice-versa) are not reported
or controlled



Problem Description:
Keywords: TRACE, TRCE, IFD, IFF, ILD, OFD, clock2pad, pad2setup

Reference Number:   14018

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 workaroun
d 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