AR# 14175

|

5.1i NGDBuild - Is it possible to constrain a bus with "NET "signal_name" LOC=P32, P33, P34;" from the pin-locking section of the UCF template?

描述

Keywords: bus, NET, UCF, NGDBuild, LOC, constraints, 4.1i, 5.1i

Urgency: Standard

General Description:
Is it possible to constrain a bus with "NET "signal_name" LOC=P32, P33, P34;" from the pin-locking section of the UCF template?

解决方案

No -- this constraint may only be used to constrain a single signal to a range of pins. For example, in the following constraint, "signal_name" will be assigned to either P32, P33, or P34:

NET "signal_name" LOC=P32, P33, P34;

The only way to assign bus signals to pins is to break the bus down, and assign it to the pins. For example, in the following constraint, "bus_name<2:0>" will be assigned to P32, P33, and P34 respectively:

NET "bus_name<2>" LOC=P32;
NET "bus_name<1>" LOC=P33;
NET "bus_name<0>" LOC=P34;
AR# 14175
日期 03/06/2005
状态 Archive
Type 综合文章
People Also Viewed