Answers Database
XNFPREP: Error 3526: Illegally inverted pin with XBLOX SYNC_RAM symbol
Record #1051
Product Family: Software
Product Line: XACT FPGA
Product Part: xblox
Product Version: 5.2
Problem Title:
XNFPREP: Error 3526: Illegally inverted pin with XBLOX SYNC_RAM symbol
Problem Description:
Urgency: Standard
General Description:
During compilation of a XC4000E design containing an XBLOX SYNC_RAM
component, XNFPrep may give the following error:
XNFPREP: ERROR 3526:
The pin 'D' on the symbol <symbol name> (type = RAMS, output signal =
[signal name]) is illegally inverted. This pin in non-invertible.
This error is occurs while placing either an INVBUS symbol or INV symbol on
the WR_CLK pin to clock the synchronous RAM on the falling edge. XBLOX
pushes the inversion onto the device pin instead of leaving the inverter
separate as it should.
Solution 1:
Place an X (explicit) property on the net between the INV/INVBUS and the
SYNC_RAM. This will prevent the inverter from being absorbed into the D
pin of the synchronous RAM.
End of Record #1051 - Last Modified: 05/24/99 11:32 |
