Motorola MPC823e Reference Manual page 485

Table 16-7. DSP Parameter RAM Memory Map
ADDRESS
DSP Base + 0x00
DSP Base + 0x04
DSP Base + 0x08
DSP Base + 0x0C to 0x0F
DSP Base + 0x10
DSP Base + 0x12
DSP Base + 0x14
DSP Base + 0x16
DSP Base + 0x18
DSP Base + 0x1A
DSP Base + 0x1C
DSP Base + 0x1E
DSP Base + 0x20
DSP Base + 0x22
DSP Base + 0x24
DSP Base + 0x26
DSP Base + 0x28
DSP Base + 2A
NOTE: You are only responsible for initializing the items in bold.
DSP Base = (IMMR & 0xFFFF0000) + 0x3EC0 (DSP1) and 0x3FC0 (DSP2).
FDBASE—Function Descriptor Table Base Address
This index pointer defines the location in system memory where the function descriptor
starts. However, you must initialize it.
FD_PTR—Function Descriptor Pointer
This pointer points to the current function descriptor address. It is only used by the RISC
microcontroller, so you do not need to modify it in any way.
DSTATE—Current State
This bit defines the internal state of the RISC microcontroller. It is only used by the RISC
microcontroller, so you do not need to modify it in any way.
DSTATUS—Current Function Descriptor Status
This bit defines the current status of the current function descriptor. It is only used by the
RISC microcontroller, so you do not need to modify it in any way.
MOTOROLA
NAME WIDTH
FDBASE Word
FD_PTR Word
DSTATE Word
RES Word
DSTATUS Half-word
I Half-word
TAP Half-word
CBASE Half-word
— Half-word
XPTR Half-word
— Half-word
YPTR Half-word Current Function Descriptor Pointer to Output Buffer Pointer
M Half-word
— Half-word
N Half-word
— Half-word
K Half-word
— Half-word
MPC823e REFERENCE MANUAL
Communication Processor Module
DESCRIPTION
Function Descriptor Table Base Address
Function Descriptor Pointer
DSP State
Reserved
Current Function Descriptor Status
Current Function Descriptor Number of Iterations
Current Function Descriptor Number of TAPs
Current Function Descriptor Cbase Pointer
Current Function Descriptor Sample Buffer Size-1
Current Function Descriptor Pointer to Sample Pointer
Current Function Descriptor Output Buffer Size-1
Current Function Descriptor Sample Buffer Size-1
Current Function Descriptor Sample Buffer Pointer
Current Function Descriptor Output Buffer Size-1
Current Function Descriptor Output Buffer Pointer
Current Function Descriptor Coefficient Buffer Size-1
Current Function Descriptor Coefficient Buffer Pointer
16-31