CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
User’s Manual U12688EJ4V0UM00
188
(2) Flyby transfer between internal RAM and internal peripheral I/O
Internal RAM and internal peripheral I/O are mapped on different address spaces. Therefore, different
addresses are always output, and the read/write strobe signals for internal RAM and internal peripheral I/O
are controlled at the same time.
Figure 6-9 shows an example of flyby DMA transfer (block transfer mode) between internal RAM and internal
peripheral I/O.
Figure 6-9. Timing of Flyby Transfer (Internal Peripheral I/O
→
→
→
→
Internal RAM)
TI
TI
TI
TI
Internal peripheral
I/O address bus
Internal
address bus
Internal data bus
CLKOUT
DMARQn
DMAAKn
TCn
H
Internal DMA
request signal
T2F
T2F
T3
T3
T3F
T3F
T3F
T1F
T0
T0
T1F
TE
TI
Data
Data
Data
Data
Address
Address
Address
Address
Remarks 1. The circles indicate the sampling timing.
2. Broken lines indicate high impedance.
3. n = 0 to 3
4. With this timing, the external bus operates independently of the internal bus, so there is no
influence on the external bus.
Содержание V850E/MS1 UPD703100
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