Altera Integer Arithmetic IP User Manual
Page 96
Parameter Name
Type
Required
Description
MUTIPLIER3_DIRECTION
String
No
Specifies whether the fourth
and all subsequent odd-
numbered multipliers add or
subtract their results from the
total. Values are
ADD
and
SUB
.
If the
addnsub3
port is used,
this parameter is ignored. If
omitted, the default value is
ADD
.
NUMBER_OF_MULTIPLIERS
Integer
Yes
Number of multipliers to be
added together. Values are
1
up to
4
.
WIDTH_C
Integer
Yes
Specifies the width of the
datac[]
port.
WIDTH_COEF
Integer
Yes
Specifies the width of the
coefsel[]
port.
LOADCONST_VALUE
Integer
No
Pre-load constant value to
complement accumulator
mode. Values are 2^N where
0 < N < 64.
PREADDER_MODE
String
No
Specifies the mode of pre-
adder settings to be used.
Values are
SIMPLE
,
COEF
,
INPUT
,
SQUARE
, and
CONSTANT
. The default value
is
SIMPLE
.
PREADDER_DIRECTION_0
String
No
Specifies whether the pre-
adder of the first multiplier
adds or subtracts its value
from the sum. Values are
ADD
and
SUB
. If omitted, the
default value is
ADD
.
PREADDER_DIRECTION_1
String
No
Specifies whether the pre-
adder of the second
multiplier adds or subtracts
its value from the sum.
Values are ADD and SUB. If
omitted, the default value is
ADD.
PREADDER_DIRECTION_2
String
No
Specifies whether the pre-
adder of the third multiplier
adds or subtracts its value
from the sum. Values are
ADD
and
SUB
. If omitted, the
default value is
ADD
.
UG-01063
2014.12.19
ALTMULT_ACCUM Parameters
8-15
ALTMULT_ACCUM (Multiply-Accumulate)
Altera Corporation