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AR# 15151

5.1i XST - The REAL VHDL data type is supported in the 5.1i software (with certain limitations)


Keywords: REAL, VHDL, data, type, XST, float, double

Urgency: Standard

General Description:
XST can now process REAL DATA types, with the following limitations:

1. LOG, ARCTAN, ARCTANH, ARCCOSH, ARCSINH functions will all return incorrect values.
2. The REALMAX function will return the smallest real number instead of the largest real number.
3. XST will truncate large real numbers.


This problem is fixed in the latest 5.1i Service Pack, available at:
The first service pack containing the fix is 5.1i Service Pack 1.
AR# 15151
Date 07/18/2007
Status Archive
Type General Article