CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
250
User’s Manual U14359EJ4V0UM
Figure 6-18. Page ROM Access Timing During DMA Flyby Transfer
(a) Page ROM
→
→
→
→
external I/O
T1
T2
Address
Data
WAIT (input)
D0 to D15 (I/O)
IOWR (output)
IORD (output)
LWR/LCAS (output)
UWR/UCAS (output)
WE (output)
OE (output)
RD (output)
CSn/RASm (output)
BCYST (output)
A0 to A25 (output)
CLKOUT (output)
TI
T1
TF
TW
TF
T2
DMAAKx (output)
Address
Data
H
H
H
H
H
When TI is inserted
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