Motorola MPC823e Reference Manual page 520

Communication Processor Module
16.3.4.9.2 LMS1 Function Descriptor. The LMS1 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.
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 the 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 Scalar
0 = The scalar (E) is a real number.
1 = The scalar (E) is a complex number.
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.
16-66
3 4 5 6 7
I Z RES INDEX
RESERVED
CBASE
XYPTR
EPTR
RESERVED
MPC823e REFERENCE MANUAL
8 9 10 11
RES
K
M
12 13 14 15
OPCODE
MOTOROLA