Altera Floating-Point - Manual (Page 85)

Table 10-5: ALTFP_INV Megafunction Output Ports
Port Name Required Description
result[]
Yes The floating-point inverse result of the value at the
data[]
input port. The MSB is the sign, the next MSBs are
the exponent, and the LSBs are the mantissa. The size of
this port is the total width of the sign bit, exponent bits,
and mantissa bits.
underflow
No Underflow exception output. Asserted when the result of
the inversion (after rounding) is a denormalized number.
zero
No Zero exception output. Asserted when the value at the
result[]
port is a zero.
division_by_zero
No Division-by-zero exception output. Asserted when the
denominator input is a zero.
nan
No NaN exception output. Asserted when an invalid inversion
occurs, such as the inversion of NaN. In this case, a NaN
value is output to the
result[]
port. Any operation
involving NaN also asserts the
nan
port.
Parameters
Table 10-6: ALTFP_INV Megafunction 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
.
UG-01058
2014.12.19
Parameters 10-5
ALTFP_INV IP Core Altera Corporation
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