Motorola MPC823e

Communication Processor Module
16-58 MPC823e REFERENCE MANUAL MOTOROLA
DSP
COMMUNICATION
16
PROCESSOR MODULE
16.3.4.6.2 IIR Function Descriptor. The IIR function descriptor bit table is described
below.
The first half-word is composed of the following bits:
S—STOP
0 = Do not stop after executiing this function descriptor.
1 = Stop after executing this function descriptor.
Bits 1, 4–5, and 8–10—Reserved
These bits are reserved and must be set to 0.
COEFFICIENTS INPUT SAMPLES OUTPUT
C(0) *
*
C(1) * *
C(2) x(n-k+1) *
C(3) * *
C(4) * Y(n-k+1)
C(5) x(n-2) *
x(n-1) *
x(n) Y(n-2)
Y(n-1)
Y(n)
2K bytes M + 1 bytes N + 1 bytes
Figure 16-23. IIR 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 INDEX RES OPCODE
OFFSET + 2
I
OFFSET + 4
TPTR
OFFSET + 6
CBASE
OFFSET + 8
M
OFFSET + A
XYPTR
OFFSET + C
N
OFFSET + E
RESERVED