CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
User’s Manual U12688EJ4V0UM00
182
Figure 6-7. Timing of Two-Cycle Transfer (2/4)
(b) Single-step transfer mode (External I/O
→
→
→
→
SRAM)
TI
TI
TI
TI
T0
T1
T1R
T2
T2R
T1
T1W
T2
T2W TE
TI
T0
T1
T1R
TW
T2R
T2
T2R
T1
T1W
TW
T2W
T2
T2W TE
TI
Address
Data
Data
Data
Data
Address
Address
Address
BCU states
DMAC states
CLKOUT
DMARQn
Internal DMA
request signal
DMAAKn
TCn
A0 to A23
D0 to D15
External I/O area
CSj/RASj
SRAM area
CSk/RASk
BCYST
RD
OE
WE
UWR/UCAS
LWR/LCAS
IORD
IOWR
WAIT
Remarks 1. The circles indicate the sampling timing.
2. Broken lines indicate high impedance.
3. n = 0 to 3
j = 0 to 7, k = 0 to 7 (However, j
≠
k.)
Содержание V850E/MS1 UPD703100
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