Altera Integer Arithmetic IP Bedienungsanleitung Seite 77

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Port Name Required Description
sel[] No Fixed coefficient selection. The size of the input port depends on the
WIDTH_S parameter value.
sload_coeff No Synchronous load coefficient input port. Replaces the current
selected coefficient value with the value specified in the coeff_in
input.
sload_data No Synchronous load data input port. Signal that specifies new
multiplication operation and cancels any existing multiplication
operation. If the MAX_CLOCK_CYCLES_PER_RESULT parameter has a
value of 1, the sload_data input port is ignored.
Table 7-3: ALTMEMMULT Megafunction Output Ports
Port Name Required Description
result[] Yes Multiplier output port. The size of the input port depends on the
WIDTH_R parameter value.
result_valid Yes Indicates when the output is the valid result of a complete multipli‐
cation. If the MAX_CLOCK_CYCLES_PER_RESULT parameter has a value
of 1, the result_valid output port is not used.
load_done No Indicates when the new coefficient has finished loading. The load_
done signal asserts when a new coefficient has finished loading.
Unless the load_done signal is high, no other coefficient value can
be loaded into the memory.
Parameters
The following table lists the parameters for the ALTMEMMULT megafunction.
Table 7-4: ALTMEMMULT Megafunction Parameters
Parameter Name Type Required Description
WIDTH_D Integer Yes Specifies the width of the data_in[]
port.
WIDTH_C Integer Yes Specifies the width of the coeff_in[]
port.
WIDTH_R Integer Yes Specifies the width of the result[]
port.
WIDTH_S Integer No Specifies the width of the sel[] port.
COEFFICIENT0 Integer Yes Specifies value of the first fixed
coefficient.
TOTAL_LATENCY Integer Yes Specifies the total number of clock
cycles from the start of a multiplica‐
tion to the time the result is available
at the output.
7-4
Parameters
UG-01063
2014.12.19
Altera Corporation
ALTMEMMULT (Memory-based Constant Coefficient Multiplier)
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