Altera Integer Arithmetic IP Bedienungsanleitung PDF herunterladen (Seite 24)

Parameter Name Type Required Description

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.

INTENDED_DEVICE_FAMILY String No This parameter is used for modeling and

behavioral simulation purposes. Create the

LPM_COUNTER megafunction with the

MegaWizard Plug-In Manager to calculate

the value for this parameter.

CARRY_CNT_EN String No Altera-specific parameter. You must use the

LPM_HINT parameter to specify the CARRY_

CNT_EN parameter in VHDL design files.

Values are SMART, ON, OFF, and UNUSED.

Enables the LPM_COUNTER function to

propagate the cnt_en signal through the

carry chain. In some cases, the CARRY_CNT_

EN parameter setting might have a slight

impact on the speed, so you might want to

turn it off. The default value is SMART, which

provides the best trade-off between size and

speed.

LABWIDE_SCLR

String No Altera-specific parameter. You must use the

LPM_HINT parameter to specify the

LABWIDE_SCLR parameter in VHDL design

files. Values are ON, OFF, or UNUSED. The

default value is ON. Allows you to disable the

use of the LAB-wide sclr feature found in

obsoleted device families. Turning this

option off increases the chances of fully

using the partially filled LABs, and thus may

allow higher logic density when SCLR does

not apply to a complete LAB. This

parameter is available for backward

compatibility, and Altera recommends you

not to use this parameter.

2-6

Parameters

UG-01063

2014.12.19

Altera Corporation

LPM_COUNTER (Counter)

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