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AR# 22360

8.1i XST - Distributed RAM with bus_delimiter set to [] gives wrong behavior

Description

Keywords : bus, delimiter, inference, incorrect

Urgency: Standard

General Description:
The behavior is not correct when using the [] bus delimiters for distributed RAM inference.

Solution

The code where XST attempts to absorb registers to pipeline the inferred distributed RAM is not flexible enough; it only assumes <> bus delimiters. As a result, when selected bus delimiters are [], register absorption fails. The result is correct but suboptimal and inconsistent with other bus_delimiter styles. This behavior will also be observed if the bus delimiter style is set to {} or ().

This issue will be fixed in ISE 8.2i.
AR# 22360
Date Created 09/04/2007
Last Updated 01/08/2009
Status Archive
Type General Article