Altera Floating-Point - Manual (Page 125)

ALTFP_CONVERT Parameters
Table 17-8: ALTFP_CONVERT Parameters
Port Name Type Required Description
WIDTH_EXP_
INPUT
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
WIDTH_EXP_INPUT
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
WIDTH_EXP_
INPUT
must be less than the value of
WIDTH_MAN_INPUT
,
and the sum of
WIDTH_EXP_INPUT
and
WIDTH_MAN_INPUT
must be less than
64
. These settings apply only to the
FLOAT2FIXED
,
FLOAT2INT
, and
FLOAT2FLOAT
operation
modes.
WIDTH_MAN_
INPUT
Integer Yes Specifies the precision of the mantissa. If this parameter
is not specified, the default is
23
. When
WIDTH_EXP_
INPUT
is
8
and the floating-point format is single-
precision, the
WIDTH_MAN_INPUT
value must be
23
.
Otherwise, the value of
WIDTH_MAN_INPUT
must be a
minimum of
31
. The value of
WIDTH_MAN_INPUT
must be
greater than the value of
WIDTH_EXP_INPUT
, and the sum
of
WIDTH_EXP_INPUT
and
WIDTH_MAN_INPUT
must be less
than
64
. These settings apply only to the
FLOAT2FIXED
,
FLOAT2INT
, and
FLOAT2FLOAT
operation modes.
WIDTH_INT
Integer Yes Specifies the integer width.
If the operation is
FIXED2FLOAT
or
INT2FLOAT
, this
parameter defines the integer width on the input side.
If the operation is
FLOAT2INT
or
FLOAT2FIXED
, this
parameter defines the result width on the output side.
The available settings are
32
bits,
64
bits or n bits. For n
bits settings, the range is from
4
bits to
64
bits.
17-10 ALTFP_CONVERT Parameters
UG-01058
2014.12.19
Altera Corporation ALTFP_CONVERT IP Core
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