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  1. 赛灵思 - All Programmable
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  3. AR# 7995: 4.1i 4000XL MAP - "ERROR:OldMap:256 - Clock buffer BUFG symbol "..." cannot be converted to a BUFGLS due to location constraints."

AR# 7995

4.1i 4000XL MAP - "ERROR:OldMap:256 - Clock buffer BUFG symbol "..." cannot be converted to a BUFGLS due to location constraints."

Description

Keywords: OldMap 256, BUFGLS, UCF

Urgency: Standard

General Description:
When I use pin LOC constraints on global clocks, the MAP report displays:

ERROR:OldMap:256 - Clock buffer BUFG symbol "..." cannot be converted to a BUFGLS due to location constraints.

解决方案

To work around this problem, LOC the clock buffer instead of using a pin LOC constraint.

For example:

INST "bufg_instance" LOC = "BUFGLS_SSW";

Clock buffers' LOCs are based on compass directions (SSW, NNW, NNE, etc.)

There are currently no plans to fix this.
AR# 7995
日期 06/13/2002
状态 Archive
Type 综合文章