Altera Integer Arithmetic IP User Manual
Page 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