Altera Integer Arithmetic IP Bedienungsanleitung PDF herunterladen (Seite 78)

Parameter Name Type Required Description

DATA_REPRESENTATION String No Specifies whether the coeff_in[]

input port and the pre-loaded

coefficients are signed or unsigned.

COEFF_REPRESENTATION String No Specifies whether the coeff_in[]

input port and the pre-loaded

coefficients are signed or unsigned.

INTENDED_DEVICE_FAMILY String No This parameter is used for modeling

and behavioral simulation purposes.

Create the ALTMEMMULT

megafunction with the MegaWizard

Plug-In Manager to calculate the

value for this parameter.

LPM_HINT String No

When you instantiate a library of

parameterized modules (LPM)

function in a VHDL Design File

(.vhd), you must use the LPM_HINT

parameter to specify an Altera-

specific parameter. For example: LPM_

HINT = "CHAIN_SIZE = 8, ONE_

INPUT_IS_CONSTANT = YES"

The default value is UNUSED.

LPM_TYPE String No Identifies the library of parameterized

modules (LPM) entity name in

VHDL design files.

MAX_CLOCK_CYCLES_PER_RESULT Integer No Specifies the number of clock cycles

per result.

NUMBER_OF_COEFFICIENTS Integer No Specifies the number of coefficients

that are stored in the lookup table.

RAM_BLOCK_TYPE String No Specifies the ram block type. Values

are AUTO, SMALL, MEDIUM, M512, and

M4K. If omitted, the default value is

AUTO.

Design Example: 8 × 8 Multiplier

This design example uses the ALTMEMMULT megafunction to generate a basic multiplier using RAM

blocks to determine the 16-bit product of two unsigned 8-bit numbers. This example uses the

MegaWizard Plug-In Manager in the Quartus II software.

The following design files can be found in altmemmult_DesignExample.zip:

memmult_ex.qar (archived Quartus II design files)

altmemmult_ex_msim (ModelSim-Altera files)

UG-01063

2014.12.19

Design Example: 8 × 8 Multiplier

7-5

ALTMEMMULT (Memory-based Constant Coefficient Multiplier)

Altera Corporation

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