Altera Integer Arithmetic IP Bedienungsanleitung Seite 115

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Port Name Required Description
scanouta[] No Output of scan chain A. Output port [WIDTH_A - 1..0]
wide. When designing with Stratix III devices, port cannot be
selected when scaninb[] is in use. Do not use scanina[]
and scaninb[] simultaneously.
scanoutb[] No Output of scan chain B. Output port [WIDTH_B - 1..0]
wide. When designing with Stratix III devices, port cannot be
selected when scanina[] is in use. Do not use scanina[]
and scaninb[] simultaneously.
Table 9-6: ALTMULT_ADD Megafunction Output Ports (Stratix III and Stratix IV Devices Only)
Port Name Required Description
chainout_sat_overflow No Overflow flag for the chainout saturation.
ALTMULT_ADD Parameters
The following table lists the parameters for the ALTMULT_ADD megafunction.
Note:
For Stratix III, Stratix IV, and Arria II GX devices, when the output result is > 36 bits (for example,
when you set width_a=18 and width_b=18), the option for rounding and saturation is disabled.
This is because additional logic is used to generate the MSB.
Table 9-7: ALTMULT_ADD Megafunction Parameters
Parameter Name Type Requi
red
Description
NUMBER_OF_MULTIPLIERS Integer Yes Number of multipliers to be
added together. Values are 1 up
to 4.
WIDTH_A Integer Yes Width of the dataa[] port.
WIDTH_B Integer Yes Width of the datab[] port.
WIDTH_RESULT Integer Yes Width of the result[] port.
Value includes all bits before
rounding and saturation.
INPUT_REGISTER_A0 String No Specifies the clock port for the
dataa[] operand of the first
multiplier. Values are UNREGIS-
TERED, CLOCK0, CLOCK1, CLOCK2,
and CLOCK3. If omitted, the
default value is CLOCK0. For
Stratix III devices, INPUT_
REGISTER_A0 must have similar
values with INPUT_REGISTER_
A[1..3].
9-14
ALTMULT_ADD Parameters
UG-01063
2014.12.19
Altera Corporation
ALTMULT_ADD (Multiply-Adder)
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