Altera Integer Arithmetic IP Manuale Utente Scaricare il pdf (Pagina 36)

Parameter Name Type Required Description

INPUT_A_IS_CONSTANT String No You must use the LPM_HINT parameter to

specify the INPUT_A_IS_CONSTANT

parameter in VHDL design files. Values

are YES, NO, and UNUSED. If dataa [] is

connected to a constant value, setting

INPUT_A_IS_CONSTANT to YES optimizes

the multiplier for resource usage and

speed. If omitted, the default value is NO.

INPUT_B_IS_CONSTANT String No You must use the LPM_HINT parameter to

specify the INPUT_B_IS_CONSTANT

parameter in VHDL design files. Values

are YES, NO, and UNUSED. If datab[] is

connected to a constant value, setting

INPUT_B_IS_CONSTANT to YES optimizes

the multiplier for resource usage and

speed. The default value is NO.

USE_EAB String No Specifies RAM block usage. Values are ON

and OFF. Setting the USE_EAB parameter to

ON allows the Quartus II software to use

embedded array blocks (EABs) to

implement 4 x 4 or (8 x const value)

building blocks in some obsolete devices.

Altera recommends that you set USE_EAB

to ON only when LCELLS are in short

supply. This parameter is not available for

simulation with other EDA simulators. If

you wish to use this parameter when you

instantiate the function in a Block Design

File (.bdf), you must specify it by entering

the parameter name and value manually

with the Parameters tab in the Symbol

Properties dialog box or in the Block

Properties dialog box. You can also use

this parameter name in a Text Design File

(.tdf) or a Verilog Design File (.v). You

must use the LPM_HINT parameter to

specify the USE_EAB parameter in VHDL

design files.

UG-01063

2014.12.19

LPM_MULT Parameters

4-5

LPM_MULT (Multiplier)

Altera Corporation

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Altera Integer Arithmetic IP Manuale Utente Pagina 36

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