UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 738

XBLOX 5.x: internal error 20224, representation_error

Description

Keywords: XBLOX, error, representation

Urgency: Standard

General Description:

XBLOX may issue the following error on designs with very wide data paths.

*** XBLOX: ERROR 20224:
INTERNAL ERROR
Please contact Xilinx Technical Support. Please provide the
following details to the support personnel. This information
will be needed by the software developers.
1. representation_error(is(_529,+(*(268435455,16),15)),2,
'integer overflow')

This can be caused by having binary counters with a COUNT_TO value of
greater than 31 bits. XBLOX represents this COUNT_TO value as a signed
32-bit integer; therefore, the maximum COUNT_TO value is 2^31-1.

解决方案

As a workaround, cascade two half-sized COUNTERs. Although this provides a
valid solution, please note that this does reduces the performance somewhat
(especially in XC4000 designs), due to the break in the carry chain.
AR# 738
创建日期 12/13/1995
Last Updated 05/24/1999
状态 Archive
Type 综合文章