Altera Floating-Point - Manual (Page 74)

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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