Notes On Use Of Ddt Module - Hitachi SH7750 Hardware Manual

Sh7750 series superh risc engine

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Four requests can be queued

Figure 14.52 Single Address Mode/Burst Mode/External Device → → → → External Bus Data

Transfer (Active Bank Address)/Direct Data Transfer Request to Channel 2

Notes on Use of DDT Module

1. Normal data transfer mode (channel 0)

Initial settings for channel 0 demand transfer must be DTR.ID = 00 and DTR.MD = 01, 10, or

11. In this case, only single address mode can be set for channel 0.

2. Normal data transfer mode (channels 1 to 3)

If a setting of DTR.ID = 01, 10, or 11 is made, DTR.MD will be ignored.

3. Handshake protocol using the data bus (valid on channel 0 only)

a. The handshake protocol using the data bus can be executed only on channel 0. (Set

DTR.ID = 00, DTR.MD = 00, DTR.SZ ≠ 101 or 110. Operation is not guaranteed if

settings of DTR.ID = 00, DTR.MD = 00, and DTR.SZ = 101 or 110 are made.)

b. If, during execution of the handshake protocol using the data bus for channel 0, a request is

input for one of channels 1 to 3, and after that DMA transfer is executed settings of

DTR.ID = 00, DTR.MD = 00, and DTR, SZ ≠ 101.110 are input in the handshake protocol

using the data bus, a transfer request will be asserted for channel 0.

Handshaking is necessary

to send additional requests

Must be ignored

(no request transmitted)

Rev. 6.0, 07/02, page 571 of 986

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