Dmac Parameter Descriptor Pointer (Dpdp); Table 15.2-1 Channel Descriptor Addresses - Fujitsu MB91F109 FR30 Hardware Manual

CHAPTER 15 DMAC

15.2 DMAC Parameter Descriptor Pointer (DPDP)

The DMAC parameter descriptor pointer (DPDP) is an internal register of the DMAC
and is used to store the first address of the DMAC descriptor table in RAM.
DPDP bits 6 to 0 are always 0, and the first address of the descriptor that can be set is
128 bytes.
DMAC Parameter Descriptor Pointer (DPDP)
The structure of the DMAC parameter descriptor pointer (DPDP) is shown below.
00000200H
This register is not initialized by resetting.
The register can be read and written.
Use a 32-bit transfer instruction to access the register.
Each descriptor that specifies the operation mode of each channel is placed at the address
specified by the DPDP. Table 15.2-1 lists the addresses at which individual descriptors are
placed.

Table 15.2-1 Channel Descriptor Addresses

DMA
channel
326
31
Descriptor address
0 DPDP + 0 (00H)
1 DPDP + 12 (0CH)
2 DPDP + 24 (18CH)
3 DPDP + 36 (24H)
7 6 0
0000000
Initial value: 0000000
Initial value: Undefined
DMA Descriptor address
channel
4 DPDP + 48 (30H)
5 DPDP + 60 (3CH)
6 DPDP + 72 (48H)
7 DPDP + 84 (54H)