Altera Integer Arithmetic IP Bedienungsanleitung PDF herunterladen (Seite 86)

Port Name Required Description

aclr2 No The third asynchronous clear input. The aclr2 port is active

high.

aclr3 No The fourth asynchronous clear input. The aclr3 port is active

high.

addnsub No Controls the functionality of the adder. If the addnsub port is

high, the adder performs an add function; if the addnsub port

is low, the adder performs a subtract function.

clock0 No Specifies the first clock input, usable by any register in the

megafunction.

clock1 No Specifies the second clock input, usable by any register in the

megafunction.

clock2 No Specifies the third clock input, usable by any register in the

megafunction.

clock3 No Specifies the fourth clock input, usable by any register in the

megafunction.

dataa[] Yes Data input to the multiplier. The size of the input port

depends on the WIDTH_A parameter value.

datab[] Yes Data input to the multiplier. The size of the input port

depends on the WIDTH_B parameter value.

ena0 No Clock enable for the clock0 port.

ena1 No Clock enable for the clock1 port.

ena2 No Clock enable for the clock2 port.

ena3 No Clock enable for the clock3 port.

signa No Specifies the numerical representation of the dataa[] port. If

the signa port is high, the multiplier treats the dataa[] port

as signed two's complement. If the signa port is low, the

multiplier treats the dataa[] port as an unsigned number.

signb No Specifies the numerical representation of the datab[] port. If

the signb port is high, the multiplier treats the datab[] port

as signed two's complement. If the signb port is low, the

multiplier treats the datab[]port as an unsigned number.

Table 8-3: ALTMULT_ACCUM Megafunction Input Ports (Stratix III and Stratix IV Devices Only)

Port Name Required Description

accum_round No Enables accumulator rounding.

Table 8-4: ALTMULT_ACCUM Megafunction Output Ports

Port Name Required Description

overflow No Overflow port for the accumulator.

UG-01063

2014.12.19

ALTMULT_ACCUM Ports

8-5

ALTMULT_ACCUM (Multiply-Accumulate)

Altera Corporation

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