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AR# 9188

CoolRunner XPLA3: How do I select a Universal Control Term? (UCLK, URST, UPST, UOE)

Description

Urgency: Standard

General Description:

How do I select a Universal Control Term? (UCLK, URST, UPST, UOE)

Solution

The Universal Control Terms are software (fitter algorithm)

determined. They are not controlled from the design entry

tools by an attribute or other. When these terms will be

used is design dependent.

For example: If a clock is driving a large number of

registers that are spread out across multiple Logic Blocks,

the software will decide if the UCLK would be a better

alternative than a Product Term clock. In this situation

it is very likely the UCLK will be used. The usage of a

UCLK can be verified in the report file.

AR# 9188
Date Created 08/21/2007
Last Updated 12/15/2012
Status Active
Type General Article