H8SXSLASH1663M datasheet(485/1504 Pages) RENESAS

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Section 11 EXDMA Controller (EXDMAC)

Rev. 2.00 Sep. 24, 2008 Page 453 of 1468

REJ09B0412-0200

Section 11 EXDMA Controller (EXDMAC)

This LSI has an on-chip four-channel external bus transfer DMA controller (EXDMAC). The

EXDMAC can carry out high-speed data transfer, in place of the CPU, to and from external

devices and external memory. Also, the EXDMAC allows external bus transfer in parallel with the

internal CPU operation when there is no external bus request from a controller other than the

EXDMAC.

11.1

Features

• Up to 4-Gbyte address space accessible

• Selection of byte, word, or longword transfer data length

• Total transfer size of up to 4 Gbytes (4,294,967,295 bytes)

Selection of free-running mode (with no total transfer size specified)

• Selection of auto-requests or external requests for activating the EXDMAC

Auto-request: Activation from the CPU (Cycle steal mode or burst mode can be selected.)

External request: Low level sensing or falling edge sensing for the

EDREQ signal can be

selected.

All of four channels can accept external requests.

• Selection of dual address mode or single address mode

Dual address mode: Both the transfer source and destination addresses are specified to transfer

data.

Single address mode: The

EDACK signal is used to access the transfer source or destination

peripheral device and the address of the other device is specified to transfer data.

• Normal, repeat, block, or cluster transfer (only for the EXDMAC) can be selected as transfer

mode

Normal transfer mode: One byte, one word, or one longword data is transferred at a single

transfer request

Repeat transfer mode:

One byte, one word, or one longword data is transferred at a single

transfer request

Repeat size of data is transferred and then a transfer address returns to

the transfer start address

Up to 64-kbyte transfers can be set as repeat size (65,536

bytes/words/longwords)

Block transfer mode:

One block data is transferred at a single transfer request

Up to 64-kbyte data can be set as block size (65,536

bytes/words/longwords)

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