Answers Database
M1.3/M1.4 CPLD: Fitter warning xr5100 - Inserting an output buffer
Record #2334
Product Family: Software
Product Line: CPLD Implementation
Product Part: hitop
Product Version: 1.3
Problem Title:
M1.3/M1.4 CPLD: Fitter warning xr5100 - Inserting an output buffer
Problem Description:
Urgency: standard
General description:
Putting the BUFG=CLK/OE/SR property on internal BUF and CKBUF
symbols will cause the fitter to issue a warning xr5100. It
inserts an OBUF for BUFG=CLK on BUF or CKBUF symbol, and for
BUFG=OE on BUF symbol. The output PAD is generated with a name
consisting of the BUF/CKBUF's input net name appended with
"/OBUF" (not a user signal name). It also disconnects CKBUF
with BUFG=OE and trims all logic.
Solution 1:
1. Use BUF components instead of CKBUFs.
2. There is no known way of getting the fitter to not insert an
OBUF.
End of Record #2334 - Last Modified: 12/28/99 11:51 |
