Floating-Point IP Cores User Guide

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ID 683750
Date 9/13/2021
Public
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10.7. Parameters

Table 64.  ALTFP_LOG IP core Parameters
Parameter Name Type Required Description
WIDTH_EXP Integer Yes Specifies the precision of the exponent. If this parameter is not specified, the default is 8. The bias of the exponent is always set to 2 (WIDTH_EXP -1) -1, that is, 127 for the single-precision format and 1023 for the double-precision format. The value of the WIDTH_EXP parameter must be 8 for the single-precision format, 11 for the double-precision format, and a minimum of 11 for the single-extended precision format. The value of the WIDTH_EXP parameter must be less than the value of the WIDTH_MAN parameter, and the sum of the WIDTH_EXP and WIDTH_MAN parameters must be less than 64.
WIDTH_MAN Integer Yes Specifies the precision of the mantissa. If this parameter is not specified, the default is 23. The value of WIDTH_MAN must be 23 for the single-precision format, and 52 for the double-precision format. For the single-extended precision format, the valid value ranges from 31 to 52. The value of WIDTH_MAN must be greater than the value of WIDTH_EXP, and the sum of WIDTH_EXP and WIDTH_MAN must be less than 64.
PIPELINE Integer Yes Specifies the amount of latency in clock cycles used in the ALTFP_LOG IP core. Create the ALTFP_LOG IP core to calculate the value for this parameter.

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