Motorola MPC823e Reference Manual page 494

Communication Processor Module
16.3.4.1.2 FIR1 Function Descriptor. The FIR1 function descriptor bit table is described
below.
0 1 2
S RES W
OFFSET + 0
OFFSET + 2
OFFSET + 4
OFFSET + 6
OFFSET + 8
OFFSET + A
OFFSET + C
OFFSET + E
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, 4, and 9–10—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.
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.
16-40
3 4 5 6 7
I RES IALL INDEX
CBASE
XYPTR
RESERVED
MPC823e REFERENCE MANUAL
8 9 10 11
PC RES
I
K
M
N
12 13 14 15
OPCODE
MOTOROLA