dsp56000 Freescale Semiconductor, Inc, dsp56000 Datasheet - Page 626
dsp56000
Manufacturer Part Number
dsp56000
Description
24-bit Digital Signal Processor Family Manual
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.DSP56000.pdf
(637 pages)
- Current page: 626 of 637
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_loop
_endl
_add_offset
;convert normal order to berglang order
norm2berg
;points is actual size of table to be converting
data_temp
; Real-Valued FFT for MOTOROLA DSP56000/1/2
;
;
;
; ______________________________
rifft macro points,binlogsz,idata,odata,twiddle,bergtable
B - 22
based on Glenn Bergland’s algorithm
sub
move
move
add
move
nop
move
add
move
move
jmp
move
move
move
do #points,_add_offset
move
add
move
endm
macro points,bergtable,twiddle
move
move
move
do
move
move
move
move
move
endm
move
move
y0,a
b,x1
r0,y0
y0,b
b,r0
a,x:(r0+n0)
x1,b
b,x0
x1,b
_star
y1,a
#>offset,a
#bergtable,r0
x:(r0),B
A,B
B,x:(r0)+
#bergtable,r0
#twiddle,r2
r2,r6
#points,data_temp
x:(r0)+,r3
r3,r7
x:(r3),a
y:(r7),b
a,x:(r2)+ b,y:(r6)+
#idata,r0
#points/4,n0
Freescale Semiconductor, Inc.
;end of sincos macro
For More Information On This Product,
BENCHMARK PROGRAMS
BENCHMARK PROGRAMS
Go to: www.freescale.com
;k-bergtabl[j]
;save b, x1=i
;y0=j=i+i
;b=j+i
;r0=j+i
;store bergtabl[j+i]
;b=j+i+i
;save b
;recover b=i
;recover a
;offset is the location of output data or twiddle
;r0=pointer of bergland table
;r2=twiddle pointer for X
;r6=twiddle pointer for Y
;get index
;get value
;write back
;r0 = ptr to a
;bflys in ea group, half at ea pass
MOTOROLA
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