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Folded Filter
Data and Coefficient Storages
The core can implement data or coefficient storages, or both using on-chip RAM blocks. Check RAM for
coefficients and/or RAM for data boxes on the folded filter UI to direct the core accordingly. Otherwise the
core utilizes fabric flip-flops to build the storage.
SmartFusion2 devices provide two types of the on-chip RAM blocks: Micro RAM and Large RAM. The core
enables the user to influence selection of a particular RAM type by using the Max micro RAM drop-down
menu. CoreFIR will utilize micro RAM if the coefficient or data storage depth does not exceed a value
selected form the menu. Otherwise it uses the Large RAM blocks. This happens only if RAM for coefficients
and/or RAM for data are checked. A recommendation on setting the Max micro RAM (parameter
URAM_MAXDEPTH) value is as follows: if Micro RAM is expected to be a scarce resource in overall design,
set a lower value. If the Large RAM is taken by other FPGA design components, select a larger value on the
Max micro RAM (uRAM) menu.
The Max uRAM menu shows up only for SmartFusion2-based designs. The value of the corresponding
URAM_MAXDEPTH parameter does not impact RTAX-based implementations.
36
CoreFIR v8.5 Handbook
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