Answers Database

PPR 5.2.x: XC5200 design with Readback gives ERROR 9905: NET "$I417/CLK"has no source


Record #2094

Product Family:  Software

Product Line:  FPGA Core

Problem Title:
PPR 5.2.x: XC5200 design with Readback gives ERROR 9905: NET
"$I417/CLK"has no source



Problem Description:
Keywords: ppr 9905 clk source
Urgency: Standard

General Description:

*** PPR: ERROR 9905:
    Net "$I417/CLK" has no source.
    The router cannot continue until this functional error
    is corrected.


Solution 1:

This error has been observed in an XC5202 design using the  READBACK symbol.  By
 default , when no signal is connected to the CLK input, the internal CCLK is to
 be used.

If this error occurs, replace the READBACK symbol with the
RDBK symbol - which is comprised of TRIG, DATA, and RIP
pins - and no CLK input.



End of Record #2094