Return to previous page ｜ Return to menu ｜ Go to next page

DDIR (R / W); Dma (transferring) DIRection
Specify the direction of DMA transfer. When this bit is "0B", the sound memory is transferred to the LSI internal register, and when "1B", the reverse is specified.

Table 4.39 DMA transfer direction
DDIR Transfer direction
0 Transfer from sound memory to LSI internal register
1 Transfer from LSI internal register to sound memory

DEXE (R / W); Dma EXEcution
Instructs the start of DMA transfer. DMA transfer starts when this bit is "1B". Writing "0B" is invalid. When DMA transfer is completed, it automatically becomes "0B".

Table 4.40 DMA transfer
DEXE Transfer status
0 Invalid or transfer completed
1 Start DMA transfer

DMEA [19: 1] (W); Dma MEmory start Address
Specify the address (word unit) of the sound memory to start DMA transfer.

DRGA [11: 1] (W); Dma ReGister start Address
Specify the address (word unit) of the LSI internal register that starts DMA transfer.

DTLG [11: 1] (W); Dma (Transferring) LenGth
Specify the number of transfer words for DMA transfer. At that time, care must be taken so that the transfer source and transfer destination areas do not exceed the sound memory area or LSI internal register area.

Return to previous page ｜ Return to menu ｜ Go to next page