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AR# 9656

4.1i Virtex-E MAP - "FATAL_ERROR:Ncd:basncsignal.c:249:1.15.26.1 - Could not find a bel..."

Description

Keywords: BX, basncsignal.c:249, Could not find a bel

Urgency: Standard

General Description:
A case has been seen where MAP failed with the error:

FATAL_ERROR:Ncd:basncsignal.c:249:1.15.26.1 - Could not find a bel for a signal
on pin BX of comp FE/LBIF/FE_LB_ADDR_DECODE/$1I651/$1N7. Its current
programmed state is : CKINV:1 DYMUX:1 DXMUX:1 F:#LUT:D=A1 G:#RAM:D=0x0000
RAMCONFIG:1SHIFT BYMUX:BY BXMUX:BX SRMUX:1 GYMUX:GXOR FXMUX:F SYNC_ATTR:ASYNC
INITY:LOW FFX:#FF FFY:#FF INITX:LOW Process will terminate. To resolve this
error, please consult the Answers Database and other online resources at
http://support.xilinx.com

Solution

1

This problem occurs because MAP is packing an XOR gate into a XORCY bel using the BX
input, but it is not configuring the MUXCY correctly.

This is fixed in the first major release following version 3.1i, currently scheduled for July, 2001.
Meanwhile, please contact the Xilinx hotline to obtain a work-around. (You will need to provide
the input netlist.)

2

In some cases, changing the "map -k" option back to the default value of 4 seems to resolve the error.
AR# 9656
Date Created 07/06/2000
Last Updated 08/19/2002
Status Archive
Type General Article