Motorola MPC823e - Page 505

Communication Processor Module
MOTOROLA MPC823e REFERENCE MANUAL 16-51
DSP
COMMUNICATION
16
PROCESSOR MODULE
16.3.4.4.2 FIR5 Function Descriptor. The FIR5 function descriptor bit table is described
below.
The first half-word is composed of the following bits:
S—STOP
0 = Do not stop after executing this function descriptor.
1 = Stop after executing this function descriptor.
COEFFICIENTS INPUT SAMPLES REAL OUTPUT
(X=0)
COMPLEX OUTPUT
(X=1)
imag{C(0)} * * *
real{C(0)} * * *
imag{C(1)} imag {x(n-k+1)} * imag{Y(n-k+1)}
real{C(1)} real {x(n-k+1)} * real{Y(n-k+1)}
* * Y(n-K+1) *
* imag {x(n-2)} * *
imag{C(k-1)} real{x(n-2)} * imag{Y(n-2)}
real{C(k-1)} imag{x(n-1)} Y(n-2) real{Y(n-2)}
real{x(n-1)} Y(n-1) imag{Y(n-1)}
imag{x(n)} Y(n) real{Y(n-1)}
real{x(n)} imag{Y(n)}
real{Y(n)}
2K bytes M + 1 bytes N + 1 bytes N + 1 bytes
Figure 16-19. FIR5 Coefficients and Sample Data Buffers
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
OFFSET + 0
S RES W I Z IALL INDEX PC RES OPCODE
OFFSET + 2
I
OFFSET + 4
K
OFFSET + 6
CBASE
OFFSET + 8
M
OFFSET + A
XYPTR
OFFSET + C
N
OFFSET + E
RESERVED