Motorola DSP56156 Manual page 178

bcr equ $ffde
org x:0
w ds Nw
ds Nw
;
; Decimation Filter Coefficients (125:1 comb ratio)(2:1 IIR ratio)
;
dc $0216
; Biquad stage no. 1
dc -$07a2
dc $e9c9
dc $2cf8
dc $6905
; Biquad stage no. 2
dc -$3645
dc $e976
dc $34c4
dc $186c
; Biquad stage no. 3
dc -$119b
dc $f0c9
dc $2697
dc $62e2
; Biquad stage no. 4
dc -$15ea
dc $f137
dc $3866
dc $31cb
;
; Interpolation Filter Coefficients (1:125 comb ratio)(1:2 IIR ratio)
;
dc $0123
; Biquad stage no. 1
dc -$0661
dc $eb0f
dc $1b48
dc $5692
; Biquad stage no. 2
dc -$35b6
dc $ead9
dc $34d4
dc $1767
; Biquad stage no. 3
dc -$1078
dc $f271
dc $1ab7
MOTOROLA
APPLICATION EXAMPLES
;Bus control register
;x memory reserved for the states
;x memory reserved for the states
; gain = $160/0.659=[0.02149566562/2]/0.659
; to take into account the -3.618dB loss of
; the A/D CombFilter
; d2_1 = 0.1192590276/2
; d1_1 = -0.3470842361/2
; n2_1 = 0.7026065355/2
; n1_1 = 1.640903034/2
; d2_2 = 0.8479421644/2
; d1_2 = -0.3521904578/2
; n2_2 = 0.8244448877/2
; n1_2 = 0.3815657788/2
; d2_3 = 0.2750857833/2
; d1_3 = -0.2377206739/2
; n2_3 = 0.6029962664/2
; n1_3 = 1.545046163/2
; d2_4 = 0.3424061824/2
; d1_4 = -0.2310341613/2
; n2_4 = 0.8811980629/2
; n1_4 = 0.7780126911/2
; gain=$01fa*0.5758=[0.03087683765/2]*0.5758
; to take into account the +4.794dB gain of
; the D/A CombFilter
; d2_1 = 0.09967390682/2
; d1_1 = -0.3272240632/2
; n2_1 = 0.4262653287/2
; n1_1 = 1.3526638/2
; d2_2 = 0.8392111942/2
; d1_2 = -0.3304817315/2
; n2_2 = 0.8254454107/2
; n1_2 = 0.3656574962/2
; d2_3 = 0.2573392333/2
; d1_3 = -0.2118237522/2
; n2_3 = 0.4174162168/2
DSP56156 ON-CHIP SIGMA/DELTA CODEC 6 - 63