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W—Wrap (Final Function Descriptor in Table)
0 = This is not the last function descriptor in the function descriptor table.
1 = This is the last function descriptor in the function descriptor table. After this buffer
has been used, the CPM processes the first function descriptor that the FDBASE
index pointer points to in the table. The number of function descriptors in this table
are programmable and determined only by the W bit and overall space constraints
of the memory.
I—Interrupt
0 = No interrupt is generated after this function is processed.
1 = A maskable interrupt is generated after this function is processed.
INDEX— Auto-Increment Index
00 = The X (input) pointer is not incremented.
01 = The X (input) pointer is incremented by one sample.
10 = The X (input) pointer is incremented by two samples.
11 = The X (input) pointer is incremented by three samples.
OPCODE—Function Operation Code
This field specifies the function to be executed. Table 16-6 contains the value for this field.
16.3.4.6.3 IIR Parameter Packet. The IIR parameter packet is composed of seven 16-bit
half-words and described in the table below.
ADDRESS
NAME
Half-word 1
I
Half-word 2
TPTR
Half-word 3
CBASE
Half-word 4
M
Half-word 5
XYPTR
Half-word 6
N
Half-word 7
RES
16.3.4.6.4 Application Example. Among other things, the IIR is used in timing recovery
and an interpolating filter.
0
1
2
S
0
W
OFFSET + 0
OFFSET + 2
MOTOROLA
Table 16-13. IIR Parameter Packet
Number of Iterations (= cascaded stages)
Pointer to temp delay line(s) pointer
Filter Coefficients Vector Base Address Pointer
Samples Buffer Size-1. The minimum sample buffer size is 4 (2 samples).
Pointer to a structure composed of the input sample data pointer and the output
buffer pointer
Output Buffer Size-1. The minimum output buffer size is 4 (2 outputs).
Reserved
3
4
5
6
7
I
0
0
INDEX
I=1 (ONE ITERATION)
MPC823e REFERENCE MANUAL
Communication Processor Module
DESCRIPTION
8
9
10
11
12
0
0
0
13
14
15
00111
16-59
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