Motorola MPC823e - Page 509

Communication Processor Module
MOTOROLA MPC823e REFERENCE MANUAL 16-55
DSP
COMMUNICATION
16
PROCESSOR MODULE
16.3.4.5.2 FIR6 Function Descriptor. The FIR6 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 OUTPUT
imag{C(0)} * *
real{C(0)} * *
imag{C(1)} x(n-k+1) *
real{C(1)} * imag{Y(n-k+1)}
* * real{Y(n-k+1)}
* x(n-2) *
imag{C(k-1)} x(n-1) *
real{C(k-1)} x(n) imag{Y(n-2)}
real{Y(n-2)}
imag{Y(n-1)}
real{Y(n-1)}
imag{Y(n)}
real{Y(n)}
2K bytes M + 1 bytes N + 1 bytes
Figure 16-21. FIR6 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 RES 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