Features, Features -1, Altmemmult (memory-based constant – Altera Integer Arithmetic IP User Manual
Page 74: Coefficient multiplier)
ALTMEMMULT (Memory-based Constant
Coefficient Multiplier)
7
2014.12.19
UG-01063
The ALTMEMMULT megafunction is used to create memory-based multipliers using the on-chip
memory blocks found in Altera FPGAs (with M512, M4K, M9K, and MLAB memory blocks). This
megafunction is useful if you do not have sufficient resources to implement the multipliers in logic
elements (LEs) or dedicated multiplier resources.
The ALTMEMMULT megafunction is a synchronous function that requires a clock. The
ALTMEMMULT megafunction and the MegaWizard Plug-In Manager create a multiplier with the
smallest throughput and latency possible for a given set of parameters and specifications.
The following figure shows the ports for the ALTMEMMULT megafunction.
Figure 7-1: ALTMEMMULT Ports
data_in[]
inst
ALTMEMMULT
coeff_in[]
sload_data
result[]
result_valid
sload_coeff
sclr
clock
load_done
Features
The ALTMEMMULT megafunction offers the following features:
• Creates only memory-based multipliers using on-chip memory blocks found in Altera FPGAs
• Supports data width of 1–512 bits
• Supports signed and unsigned data representation format
• Supports pipelining with fixed output latency
• Stores multiples constants in random-access memory (RAM)
• Provides an option to select the RAM block type
• Supports optional synchronous clear and load-control input ports
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