Altera Integer Arithmetic IP Bedienungsanleitung PDF herunterladen (Seite 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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