Communication Processor Module
MOTOROLA MPC823e REFERENCE MANUAL 16-53
DSP
COMMUNICATION
16
PROCESSOR MODULE
16.3.4.4.3 FIR5 Parameter Packet. The FIR5 parameter packet is composed of seven
16-bit half-words and described in the table below.
16.3.4.4.4 Application Example. The FIR5 function is used in the fractionally spaced
equalizer. The following example demonstrates how the function descriptor structure can be
used to implement a fractionally spaced equalizer.
Table 16-11. FIR5 Parameter Packet
ADDRESS NAME DESCRIPTION
Half-word 1 I Number of Iterations
Half-word 2 K Number of TAPs-1.
Half-word 3 CBASE Filter Coefficients Vector Base Address Pointer
Half-word 4 M Samples Buffer Size-1. The minimum sample buffer size is 8 (2 samples).
Half-word 5 XYPTR Pointer to a structure composed of the input sample data pointer and the output
buffer pointer
Half-word 6 N Output Buffer Size-1. The minimum output buffer size for x=1 is 8 (2 outputs). The
minimum output buffer size for x=0 is 4 (2 outputs).
Half-word 7 RES Reserved
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
OFFSET + 0
S 0 W I 1 0 11 0 0 0 00101
OFFSET + 2
I=1 (ONE ITERATION)
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