Altera Integer Arithmetic IP - Manual (Page 87)

Port Name Required Description
result[]
Yes Accumulator output port. The size of the output port depends
on the
WIDTH_RESULT
parameter value.
scanouta[]
No Output of the first shift register. The size of the output port
depends on the
WIDTH_A
parameter value. When instantiating
the ALTMULT_ACCUM megafunction with the
MegaWizard Plug-In Manager, the MegaWizard Plug-In
Manager renames the
scanouta[]
port to
shiftouta
port.
scanoutb[]
No Output of the second shift register. The size of the input port
depends on the
WIDTH_B
parameter value. When instantiating
the ALTMULT_ACCUM megafunction with the
MegaWizard Plug-In Manager, the MegaWizard Plug-In
Manager renames the
scanoutb[]
port to
shiftoutb
port.
ALTMULT_ACCUM Parameters
The following table lists the parameters for the ALTMULT_ACCUM megafunction.
Table 8-5: ALTMULT_ACCUM Megafunction Parameters
Parameter Name Type Required Description
ACCUM_DIRECTION
String No Specifies whether the
accumulator performs an add
or subtract function. Values
are
ADD
and
SUB
. When this
parameter is set to
ADD
, the
accumulator adds the
product to the current
accumulator value. When
this parameter is set to
SUB
,
the accumulator subtracts the
product from the current
accumulator value. If omitted
the default value is
ADD
. This
parameter is ignored if the
addnsub
port is used.
ACCUM_SLOAD_ACLR
String No Specifies the asynchronous
clear signal for the
accum_
sload
port. Values are
ACLR0
,
ACLR1
,
ACLR2
, and
ACLR3
. If
omitted the default value is
ACLR3
. This parameter is
ignored if the
accum_sload
port is unused.
8-6 ALTMULT_ACCUM Parameters
UG-01063
2014.12.19
Altera Corporation ALTMULT_ACCUM (Multiply-Accumulate)
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