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AR# 18974

6.2i XST - "ERROR:Xst:1548 - file.vhd line xx: Negative range in type of signal <h> is not supported"

Description

Keywords: std_logic_vector, real

Urgency: Standard

General Description:
In designs that use real type functions, XST incorrectly synthesizes the design and issues the following error message:

"ERROR:Xst:1548 - file.vhd line xx: Negative range in type of signal <h> is not supported."

Solution

1

For real type functions, this problem has been fixed in the latest 6.2i Service Pack, available at:
http://support.xilinx.com/xlnx/xil_sw_updates_home.jsp
The first service pack containing the fix is 6.2i Service Pack 1.

2

If you are not using real data types in your design, then the XST error message is correct because negative ranges are not supported.
AR# 18974
Date Created 02/17/2004
Last Updated 07/18/2007
Status Archive
Type General Article