Motorola MPC823e - Page 485

Communication Processor Module
MOTOROLA MPC823e REFERENCE MANUAL 16-31
DSP
COMMUNICATION
16
PROCESSOR MODULE
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.
Table 16-7. DSP Parameter RAM Memory Map
ADDRESS NAME WIDTH DESCRIPTION
DSP Base + 0x00 FDBASE Word Function Descriptor Table Base Address
DSP Base + 0x04 FD_PTR Word Function Descriptor Pointer
DSP Base + 0x08 DSTATE Word DSP State
DSP Base + 0x0C to 0x0F RES Word Reserved
DSP Base + 0x10 DSTATUS Half-word Current Function Descriptor Status
DSP Base + 0x12 I Half-word Current Function Descriptor Number of Iterations
DSP Base + 0x14 TAP Half-word Current Function Descriptor Number of TAPs
DSP Base + 0x16 CBASE Half-word Current Function Descriptor Cbase Pointer
DSP Base + 0x18 — Half-word Current Function Descriptor Sample Buffer Size-1
DSP Base + 0x1A XPTR Half-word Current Function Descriptor Pointer to Sample Pointer
DSP Base + 0x1C — Half-word Current Function Descriptor Output Buffer Size-1
DSP Base + 0x1E YPTR Half-word Current Function Descriptor Pointer to Output Buffer Pointer
DSP Base + 0x20 M Half-word Current Function Descriptor Sample Buffer Size-1
DSP Base + 0x22 — Half-word Current Function Descriptor Sample Buffer Pointer
DSP Base + 0x24 N Half-word Current Function Descriptor Output Buffer Size-1
DSP Base + 0x26 — Half-word Current Function Descriptor Output Buffer Pointer
DSP Base + 0x28 K Half-word Current Function Descriptor Coefficient Buffer Size-1
DSP Base + 2A — Half-word Current Function Descriptor Coefficient Buffer Pointer
NOTE: You are only responsible for initializing the items in bold.
DSP Base = (IMMR & 0xFFFF0000) + 0x3EC0 (DSP1) and 0x3FC0 (DSP2).