Functional Overview
Table 3–9 lists the DMD bit values and their corresponding destination space.
Table 3–9. DMD Section of the DMMCRn Register
DMD
00
01
10
11
DESTINATION SPACE
PS
DS
I/O
Reserved
For the CPU external access, software can configure the memory cells to reside inside or outside the program
address map. When the cells are mapped into program space, the device automatically accesses them when
their addresses are within bounds. When the address generation logic generates an address outside its
bounds, the device automatically generates an external access.
Two new registers are added to the 5407/5404 DMA to support DMA accesses to/from DMA extended data
memory, page 1 to page 127.
•
•
The DMA extended source data page register (XSRCDP[6:0]) is located at subbank address 028h.
The DMA extended destination data page register (XDSTDP[6:0]) is located at subbank address 029h.
3.12.3
DMA Memory Map
The DMA memory map, shown in Figure 3–19, allows the DMA transfer to be unaffected by the status of the
MP/MC, DROM, and OVLY bits.
32
SPRS007B
November 2001 – Revised July 2003
TI [ TEXAS INSTRUMENTS ]
