Altera Integer Arithmetic IP Bedienungsanleitung PDF herunterladen (Seite 126)

Table 9-8: ALTMULT_ADD Megafunction Parameters (Stratix II, Stratix III, and Stratix IV Devices Only)

Parameter Name Type Requi

red

Description

OUTPUT_SATURATE_TYPE String No Specifies the saturation mode.

Values are SYMMETRIC and

ASYMMETRIC. A value of

SYMMETRIC specifies the absolute

value of the maximum negative

number equal to the maximum

positive number. A value of

ASYMMETRIC specifies the

maximum negative number is

larger than the maximum

positive number. If omitted, the

default value is ASYMMETRIC.

WIDTH_SATURATE_SIGN

String No Specifies the saturation position.

The value is determined by

counting the bits that become the

sign bits after saturation. Values

are calculated according to the

following modes- WIDTH_A,

WIDTH_B, and WIDTH_RESULT.

Value must be an unsigned

integer. If a positive number is

unavailable, no saturation is

allowed in your input/output

width and mode setting. If

omitted, the default value is 1.

CHAINOUT_ADDER

String No Specifies the chainout mode of

the final adder stage. Values are

YES and NO. If omitted, the

default value is NO.

ACCUMULATOR String No Specifies the accumulator mode

of the final adder stage. Values

are YES and NO. If omitted, the

default value is NO. When value is

set to YES, rounding is dynamic

and you must initialize the

accumulator while rounded data

is acquired.

Table 9-9: ALTMULT_ADD Megafunction Parameters (Stratix III and Stratix IV Devices Only )

Parameter Name Type Requi

red

Description

WIDTH_CHAININ Integer No Width of the chainin[] port.

WIDTH_CHAININ equals WIDTH_

RESULT if port chainin is used. If

omitted, the default value is 1.

UG-01063

2014.12.19

ALTMULT_ADD Parameters

9-25

ALTMULT_ADD (Multiply-Adder)

Altera Corporation

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