Altera Floating-Point - Manual (Page 67)

Table 7-5: ALTFP_MULT Megafunction Parameters
Parameter Name Type Required Description
WIDTH_EXP
Integer No Specifies the value of the exponent. If this
parameter is not specified, the default is
8
.
The bias of the exponent is always
2 (WIDTH_
EXP - 1) -1
(that is,
127
for the single-
precision format and
1023
for the double-
precision format).
WIDTH_EXP
must be
8
for the single-precision format or a
minimum of
11
for the double-precision
format and the single-extended precision
format.
WIDTH_EXP
must less than
WIDTH_
MAN
. The sum of
WIDTH_EXP
and
WIDTH_
MAN
must be less than
64
.
WIDTH_MAN
Integer No Specifies the value of the mantissa. If this
parameter is not specified, the default is
23
. When
WIDTH_EXP
is
8
and the floating-
point format is single-precision, the
WIDTH_MAN
value must be
23
; otherwise,
the value of
WIDTH_MAN
must be a
minimum of
31
. The
WIDTH_MAN
value
must always be greater than the
WIDTH_
EXP
value. The sum of
WIDTH_EXP
and
WIDTH_MAN
must be less than
64
.
DEDICATED_MULTIPLIER_ CIRCUITRY
String No Specifies whether to use dedicated
multiplier circuitry. Values are
AUTO
,
YES
,
or
NO
. If this parameter is not specified, the
default is
AUTO
. If a device does not have
dedicated multiplier circuitry, the
DEDICATED_MULTIPLIER_CIRCUITRY
parameter has no effect and defaults to
NO
.
PIPELINE
Integer No Specifies the number of clock cycles
needed to produce the multiplied result.
Values are
5
,
6
,
10
, and
11
. If this
parameter is not specified, the default is
5
.
ALTFP_MULT Signals
Table 7-6: ALTFP_MULT IP Core Input Signals
Port Name Required Description
clock
Yes Clock input to the IP core.
clk_en
No Clock enable. Allows multiplication to take place when asserted high.
When signal is asserted low, no multiplication occurs and the outputs
remain unchanged.
UG-01058
2014.12.19
ALTFP_MULT Signals 7-5
ALTFP_MULT IP Core Altera Corporation
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