CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
246
User’s Manual U14359EJ4V0UM
Figure 6-16. Timing of Flyby Transfer (DRAM
→
→
→
→
External I/O) (2/3)
(b) Single transfer mode
TI
TI
TI
TI
TO
T2FH
T1
T1FH
T2
T2FH
T1
T2FH
T2
T1FH
TRPW
TI
TI
TI
TI
TE
TF
TI
TO
TI
T1FH
TRPW
Note
Note
TF
TE
CSn (output) of
external I/O area
D0 to D15 (I/O)
A0 to A25 (output)
Internal DMA
request signal
DMARQx (input)
CLKOUT (output)
BCYST (output)
TCx (output)
RASm (output) of
DRAM area
OE (output)
RD (output)
IORD (output)
IOWR (output)
WAIT (input)
WE (output)
Data
DMAAKx (output)
LWR/LCAS (output)
UWR/UCAS (output)
Data
Row
Col.
Row
Col.
Note
TRPW is always inserted for one or more cycles.
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 (n
≠
m)
4.
Col.: Column address
Row: Row address