Motorola MPC823e - Page 468

Communication Processor Module
16-14 MPC823e REFERENCE MANUAL MOTOROLA
RISC
COMMUNICATION
16
PROCESSOR MODULE
The dual-port RAM can either be accessed by the RISC microcontroller or one of two bus
masters—the core or the serial DMA channel. When the dual-port RAM is accessed by one
of these, it is accessed in two clocks. However, when it is accessed by the microcontroller,
it is accessed in one clock. When simultaneous accesses occur with at least one write
operation, the microcontroller is delayed by one clock.
Figure 16-5. Dual-Port RAM Memory Map
BD / DATA /µCODE
BD / DATA / µCODE
0K
6K
PARAMETER RAM
BD / DATA
ERAM = 10
BD / DATA / µCODE
7K
BD / DATA / µCODE
DPRAM_BASE = (IMMR & 0xFFFF0000) + 0x2000
DPRAM_BASE = (IMMR & 0xFFFF0000) + 0x2400
DPRAM_BASE = (IMMR & 0xFFFF0000) + 0x2800
DPRAM_BASE = (IMMR & 0xFFFF0000) + 0x3000
DPRAM_BASE = (IMMR & 0xFFFF0000) + 0x3C00
DPRAM_BASE = (IMMR & 0xFFFF0000) + 0x2200
DPRAM_BASE = (IMMR & 0xFFFF0000) + 0x2E00
3K
ERAM =11
4K
5K
2K
1K
ERAM = 01
BD / DATA / µCODE
BD / DATA / µCODE
BD / DATA
DPRAM_BASE = (IMMR & 0xFFFF0000) + 0x3800
DPRAM_BASE = (IMMR & 0xFFFF0000) + 0x3400
DPRAM_BASE = (IMMR & 0xFFFF0000) + 0x3A00
8K
BD / DATA / µCODE