Altera Integer Arithmetic IP Bedienungsanleitung PDF herunterladen (Seite 114)

Port Name Required Description

output_round No Enables dynamically controlled output rounding. When OUTPUT_

ROUNDING is set to VARIABLE, output_round enables the final

adder stage of rounding.

output_saturate No Enables dynamically controlled output saturation. When OUTPUT_

SATURATION is set to VARIABLE, output_saturate enables the

final adder stage of saturation.

chainout_round No Enables dynamically controlled chainout stage rounding. When

CHAINOUT_ROUNDING is set to VARIABLE, chainout_round enables

the chainout stage of rounding.

chainout_saturate No Enables dynamically controlled chainout stage saturation. When

CHAINOUT_SATURATION is set to VARIABLE, chainout_saturate

enables the chainout stage of saturation.

zero_chainout No Dynamically specifies whether the chainout value is zero.

zero_loopback No Dynamically specifies whether the loopback value is zero.

accum_sload No Dynamically specifies whether the accumulator value is zero.

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

[WIDTH_CHAININ - 1..0] wide.

rotate No Specifies dynamically controlled port rotation in shift mode.

shift_right No Specifies dynamically controlled port shift right or left in shift

mode. Values are 0 and 1. A value of 0 specifies a shift to the left,

a value of 1 specifies a shift to the right.

Table 9-4: ALTMULT_ADD Megafunction Input Ports (Arria V, Cyclone V, and Stratix V Devices Only )

Port Name Required Description

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

MULTIPLIERS * WIDTH_C - 1..0] wide.

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.

Table 9-5: ALTMULT_ADD Megafunction Output Ports

Port Name Required Description

result[] Yes Multiplier output port. Output port [WIDTH_RESULT -

1..0] wide.

overflow No Overflow flag. If output_saturation is enabled, overflow

flag is set.

UG-01063

2014.12.19

ALTMULT_ADD Ports

9-13

ALTMULT_ADD (Multiply-Adder)

Altera Corporation

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