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ALTFP_SQRT Parameters

Table 8-6: ALTFP_SQRT 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 value of the mantissa. If this parameter is

not specified, the default is 23. When the WIDTH_EXP

parameter is 8 and the floating-point format is single-

precision, the WIDTH_MAN parameter value must be 23.

Otherwise, the value of the WIDTH_MAN parameter must

be a minimum of 31. The value of the WIDTH_MAN

parameter must be greater than the value of the

WIDTH_EXP parameter. The sum of the WIDTH_EXP and

WIDTH_MAN parameters must be less than 64.

ROUNDING String Yes Specifies the rounding mode. The default value is TO_

NEAREST. Other rounding modes are not supported.

PIPELINE Integer Yes Specifies the number of clock cycles for the square

root results of the result[] port. Values are WIDTH_

MAN + 5 and ((WIDTH_MAN + 5/2)+2) as specified by

truncating the radix point.

8-6

ALTFP_SQRT Parameters

UG-01058

2014.12.19

Altera Corporation

ALTFP_SQRT

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