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Communication Processor Module
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.
Bits 1, 9, and 10—Reserved
These bits are reserved and must be set to 0.
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.
Z— Complex Output
0 = Only the real component of the result is written to the output buffer.
1 = The real and imaginary parts of the result are written to the output buffer.
IALL— Auto-Increment X For All Iterations
0 = The X (input) data pointer is incremented (Modulo M+1) by the number of samples
specified in the INDEX field after the last iteration.
1 = The X data pointer is incremented (Modulo M+1) by the number of samples
specified in the INDEX field after each iteration.
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.
PC— Preset Coefficients Pointer
0 = The coefficients pointer is not preset after each iteration.
1 = The coefficients pointer is preset after each iteration to the CBASE pointer.
OPCODE—Function Operation Code
This field specifies the function to be executed. Table 16-6 contains the value for this field.
16-48
MPC823e REFERENCE MANUAL
MOTOROLA
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