Motorola MPC823e Reference Manual page 491

16.3.3.5.2 DSP Programming Example (Core and CPM). Figure 16-11 illustrates the
organization of the data buffer and function descriptor data in system memory and dual-port
RAM. The function descriptor resides in system memory and all input, ouput, and coefficient
data must reside in dual-port RAM. The transmit and modulation function descriptor chain
can reside in either system memory or dual-port RAM.
DUAL-PORT RAM
OUTPUT
BUFFER
OUTPUT
BUFFER
Figure 16-11. Core and CPM Implementation
MOTOROLA
COEFF
TABLE
INPUT
BUFFER
INPUT POINTER
OUTPUT POINTER
MOD TABLE PTR
MOD
TABLE
INPUT POINTER
OUTPUT POINTER
MPC823e REFERENCE MANUAL
Communication Processor Module
SYSTEM MEMORY
TX FILTER FD
OPCODE = FIR2
# OF ITTERATIONS
# OF TAPS
COEFF BASE
IN BUFFER SIZE
XYPTR
OUT BUFFER SIZE
MODULATION FD
OPCODE = MOD
# OF ITTERATIONS
MOD TABLE SIZE
MPTR
IN BUFFER SIZE
XYPTR
OUT BUFFER SIZE
16-37