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AR# 2327

1.3 CPLD XC9500 Family- PWR_MODE attribute cannot be placed on non-logic symbols

Description

Keywords: 1.5i, PWR_MODE, Low Power, 9500, 5021

Urgency: Standard

General Description:

The following applies to the 1.3 and earlier versions of the CPLD fitter.
The more recent versions of software support this attribute on either
nets or instances.

When the PWR_MODE attribute is applied in a UCF file, it must
be attached to an "logic symbol" instance. If it is attached
to a net you will see the following warning from the fitter
indicating that the attribute is not accepted:

WARNING:xr5021 - Parameter 'PWR_MODE' applied to non-logic
symbol '$1N70' (e.g., IPAD, IBUF, OBUF). You can only use this
parameter on macrocell logic symbols.

NOTE: PWR_MODE is allowed on an OPAD. In this case it will be
backward traced to the macrocell associated with it.

解决方案

Use the following syntax in the UCF file to attach the property
to the logic symbol:

INST MY_FF PWR_MODE=LOW;

DO NOT use the following syntax in the UCF, which would attach
the property to a net:

NET DATA0 PWR_MODE=LOW;
AR# 2327
创建日期 06/07/1997
Last Updated 08/27/2001
状态 Archive
Type 综合文章