Altera Integer Arithmetic IP Bedienungsanleitung PDF herunterladen (Seite 64)

Port name Required Description

datab [] Yes Data input to the multiplier. Input port [NUMBER_OF_

MULTIPLIERS * WIDTH_B - 1 … 0] wide

datac [] No Data input to the multiplier. Input port [NUMBER_OF_

MULTIPLIERS * WIDTH_C - 1 … 0] wide

clock [] No Clock input port [0 … 2] to the corresponding register. This port

can be used by any register in the megafunction.

aclr [] No Input port [0 ... 1]. Asynchronous clear input to the

corresponding register.

ena [] No Input port [0 ... 2]. Enable signal input to the corresponding

signa No Specifies the numerical representation of the multiplier input A.

If the signa port is high, the multiplier treats the multiplier input

A port as a signed number. If the signa port is low, the multiplier

treats the multiplier input A port as an unsigned number.

signb No Specifies the numerical representation of the multiplier input B

port. If the signb port is high, the multiplier treats the multiplier

input B port as a signed two's complement number. If the signb

port is low, the multiplier treats the multiplier input B port as an

unsigned number.

scanina[] No Input for scan chain A. Input port [WIDTH_A - 1 ... 0] wide.

When the INPUT_SOURCE_A parameter has a value of SCANA, the

scanina[] port is required.

accum_sload No Dynamically specifies whether the accumulator value is constant.

If the accum_sload port is high, then the multiplier output is

loaded into the accumulator. Do not use accum_sload and

sload_accum simultaneously.

sload_accum No Dynamically specifies whether the accumulator value is constant.

If the sload_accum port is low, then the multiplier output is

loaded into the accumulator. Do not use accum_sload and

sload_accum simultaneously.

chainin [] No Adder result input bus from the preceding stage. Input port

[WIDTH_CHAININ - 1 … 0] wide.

addnsub1 No Controls the functionality of the first adder. If the addnsub1 port

is high, the first adder performs an add function. If the addnsub1

port is low, the adder performs a subtract function.

addnsub3 No Controls the functionality of the first adder. If the addnsub3 port

is high, the first adder performs an add function. If the addnsub3

port is low, the adder performs a subtract function.

coefsel0 [] No Coefficient input port[0..3] to the first multiplier.

coefsel1 [] No Coefficient input port[0..3]to the second multiplier.

coefsel2 [] No Coefficient input port[0..3]to the third multiplier.

coefsel3 [] No Coefficient input port [0..3] to the fourth multiplier.

UG-01063

2014.12.19

Ports

6-11

ALTERA_MULT_ADD (Multiply-Adder)

Altera Corporation

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