Altera Integer Arithmetic IP - Manual (Page 77)

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_
don
e 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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