HD6417750 Datasheet, PDF (623/1039 Pages) Renesas Technology Corp – SuperH RISC engine

Four requests can be queued
CLK
1st 2nd 3rd 4th
5th
Handshaking is necessary
to send additional requests
A25–A0
D63–D0
RAS,
CAS, WE
CA
CA
CA
CA
D0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3
WT
WT
WT
WT
ID1, ID0
Must be ignored
(no request transmitted)
Figure 14.52 Single Address Mode/Burst Mode/External Device → External Bus Data
Transfer (Active Bank Address)/Direct Data Transfer Request to Channel 2
14.5.4 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.
Rev. 6.0, 07/02, page 571 of 986