Motorola MPC823e - Page 497

Communication Processor Module
MOTOROLA MPC823e REFERENCE MANUAL 16-43
DSP
COMMUNICATION
16
PROCESSOR MODULE
16.3.4.2.2 FIR2 Function Descriptor. The FIR2 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
C(0) * *
C(1) * *
C(2) imag {x(n-k+1)} *
real {x(n-k+1)} imag{Y(n-k+1)}
* real{Y(n-k+1)}
C(k-1) imag {x(n-2)} *
real{x(n-2)} *
imag{x(n-1)} imag{Y(n-2)}
real{x(n-1)} real{Y(n-2)}
imag{x(n)} imag{Y(n-1)}
real{x(n)} real{Y(n-1)}
imag{Y(n)}
real{Y(n)}
2K bytes M + 1 bytes N + 1 bytes
Figure 16-15. FIR2 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