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Chapter 4: Functional Description
FIR Compiler
where:
4–5
■
< FIR structure > is:
■
■
■
■
MCV—multicycle variable
SER—fully serial
MBS—multibit serial
PAR—fully parallel
■
< coefficient store > is:
■
■
■
■
LC—logic cells
M512—M512 and MLAB blocks
M4K—M4K and M9K blocks
AUTO—Automatic memory block selection
■
< allow or disallow symmetry > is:
■
■
MSYM—Take advantage of symmetric coefficients
NOSYM—Use nonsymmetric coefficients
■
< number of calculations for MCV | coefficient bit width for others > is:
■
■
for multicycle variable filters, the number of clock cycles to calculate the result
for all other filters, use the coefficient bit width
■
■
< number of coefficient sets > is the user-specified number of coefficient sets
< filter rate > is be specified as one of the following (SGL, INT, DEC)
■
■
■
SGL—Single Rate FIR Filter
INT—Interpolating FIR Filter
DEC—Decimating FIR Filter
■
< filter factor > is an integer value representing the rate-changing factor.
■
■
For single-rate filters, this argument should be set to 1
For multirate FIR filters, this argument should be an integer between 1 and 16
■
< coefficient bit width > is the integer value representing the user-specified coefficient
bit width, which ranges from 2-32
For example:
coef_seq.exe D:/FIR/coef_log.txt D:/FIR/coef_in.txt MCV M4K MSYM 4 1 SGL 1 8
1
The program checks for symmetry automatically, but you can force it to disallow
symmetry. Your specification should be consistent with the setting in the FIR
Compiler wizard.
The reloading capability allows you to change coefficient values. These filters may
contain optimizations for symmetrical filters. If you want a filter that may need both
symmetrical and non-symmetrical filters, turn on Force Non-Symmetrical Structures
in the Architecture Specification section of the Parameterize FIR Compiler page.
? May 2011
Altera Corporation
FIR Compiler User Guide
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