CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
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User’s Manual U14359EJ4V0UM
Figure 6-17. Timing of Access to SRAM, External ROM, and External I/O During DMA Flyby Transfer (2/2)
(b) External I/O
→
→
→
→
SRAM
TASW
T1
Address
Data
WAIT (input)
D0 to D15 (I/O)
IOWR (output)
IORD (output)
Note
LWR/LCAS/LDQM (output)
UWR/UCAS/UDQM (output)
WE (output)
OE (output)
RD (output)
CSn/RASm (output)
BCYST (output)
A0 to A25 (output)
CLKOUT (output)
TF
T1
T2
When TASW is inserted
TW
TF
T2
DMAAKx (output)
Address
Data
LBE (output)
UBE (output)
Note
During DMA flyby transfer, the rise timing of this read cycle is different from that of other transfer
operations.
Remarks 1.
The
circle
{
indicates the sampling timing.
2.
The broken lines indicate the high-impedance state.
3.
n = 0 to 7, m = 1, 3, 4, 6, x = 0 to 3