Motorola DSP96002 - Manual (Page 542)

MOTOROLA DSP96002 USER’S MANUAL B-23
fmpy d5,d9,d0 fsub.s d1,d2 y:(r1)-n1,d8.s 1 1
fmpy d6,d8,d1 fadd.s d0,d3 y:(r5)-n5,d9.s 1 1
fmpy.s d6,d9,d0 d3.s,x:(r4) y:(r2),d4.s 1 1
fmpy.s d4,d8,d3 d2.s,y:(r4)+n4 1 1
fmpy d4,d9,d2 fsub.s d0,d3 y:(r1)-n1,d8.s 1 1
fadd.s d2,d1 y:(r5)-n5,d9.s 1 1
move d1.s,x:(r4) d3.s,y: 1 1
_end_bfy
move #coef,r5 ;point at wi0 2 2
move #coef+table/4,r1 ;point at wr0 2 2
move #0,r3 ;reset group index counter 1 1
_end_grp
move n0,d0.l ;get butterflies per group 1 1
lsr d0.l ; 1 1
lsr d0.l n2,d1.l ;divide butterflies/group by 4 1 1
lsl d1.l d0.l,n0 ;multiply groups/pass by 4 1 1
lsl d1.l n3,d0.l ;get w rotation factor 1 1
lsl d0.l d1.l,n2 ;multiply rotation factor by 4 1 1
lsl d0.l n0,n4 ; 1 1
move d0.l,n3 ; 1 1
move n0,d1.l ;check for 1 butterfly per group 1 1
lsr d1.l ; 1 1
jne skip ; 1 2
move #0,n3 ;reset rotation factor - last pass 1 1
skip nop ; 1 1
_end_pass ; --- ---
endm ; 78 82
The speed for 1024 points using a 75ns instruction cycle is 2.72ms, assuming internal program and internal
data memory.
B.1.16 LMS ADAPTIVE FILTER
z
-1
z
-1
z
-1
∑
∑
+
-
f(n)
e(n)
x(n)
x(0)
x(n-1) x(n-2) x(n-3)
h0 h1 h2 h3
d(n)