Answers Database
M1.5 Map - Map fatal error when IFDX output is fed back to OFDTX loc'd to same pad.
Record #5075
Problem Title:
M1.5 Map - Map fatal error when IFDX output is fed back to OFDTX loc'd to same pad.
Problem Description:
FATAL_ERROR:x4kma:x4kmap.c:3087:1.151 - 0 flip-flop basic
elements found, at least 1 expected for CLB amcc_DQ_outff<31>.
The design has an IBUF, IFDX and OFDTX all LOC'd to P98.
The error is related to the fact that the IFDX ouput drives
the OFDTX input (see net configreg_1<31>). If I put a buffer
between this net and the OFDTX input, the design maps okay.
Solution 1:
The problem occurs when the STARTUP is connected to a pin of the OFDTX. The work-around is to inser
t a buffer between the STARTUP and the OFDTX.
Solution 2:
This error has also been known to ocurr on designs with GSR nets from the STARTUP component driving
the T pin of OFDTX symbols. The work around is to place a buffer
between the GSR net and the T pin.
End of Record #5075 - Last Modified: 05/18/99 13:49 |
