7721 datasheet(349/577 Pages) RENESAS

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DMA CONTROLLER

13-70

13.7 Array chain transfer mode

7721 Group User’s Manual

13.7.1 Transfer parameter memory in array chain transfer mode

The transfer parameters required for each transfer method are described below. These parameters must

be located in series starting at an even addresses.

Figure 13.7.2 shows a transfer parameter memory map in the array chain transfer mode.

(1)

In 2-bus cycle transfer

All of the following transfer parameters are required for each block of data; that is, a transfer

parameter memory consumes 12 bytes for each block.

• Transfer source’s transfer start address (24 bits) + Dummy data (8 bits)

• Transfer destination’s transfer start address (24 bits) + Dummy data (8 bits)

• Transfer data’s byte number (24 bits) + Dummy data (8 bits)

(2)

In 1-bus cycle transfer from memory to I/O

All of the following transfer parameters are required for each block of data; that is, a transfer

parameter memory consumes 8 bytes for each block.

• Transfer source’s transfer start address (24 bits) + Dummy data (8 bits)

• Transfer data’s byte number (24 bits) + Dummy data (8 bits)

(3)

In 1-bus cycle transfer from I/O to memory

All of the following transfer parameters are required for each block of data; that is, a transfer

parameter memory consumes 8 bytes for each block.

• Transfer destination’s transfer start address (24 bits) + Dummy data (8 bits)

• Transfer data’s byte number (24 bits) + Dummy data (8 bits)

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