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Chapter 26 DMA Controller
5.Data Bus
5. Data Bus
This section shows the flow of data during 2-cycle transfer and fly-by transfer.
■ Flow of Data During 2-Cycle Transfer
Figure 14.5-1 shows examples of six types of transfer during 2-cycle transfer.
Figure 5-1 Examples of 2-Cycle Transfer (Continued on next page)
DMAC
D-bus
X-bus
I-bus
F-bus
D-bus
X-bus
I-bus
F-bus
D-bus
X-bus
I-bus
F-bus
D-bus
X-bus
I-bus
F-bus
D-bus
X-bus
I-bus
F-bus
D-bus
X-bus
I-bus
F-bus
RAM
CPU
MB91460
Read cycle
Read cycle
Read cycle
IO
Bus controller
DMAC
RAM
CPU
MB91460
Data buffer
Bus controller
Data buffer
Write cycle
Write cycle
Write cycle
IO
DMAC
RAM
CPU
MB91460
IO
DMAC
RAM
CPU
MB91460
IO
DMAC
RAM
CPU
MB91460
IO
DMAC
RAM
CPU
MB91460
IO
External area => external area transfer
External area => internal RAM area transfer
External area => built-in I/O area transfer
Bus controller
Data buffer
Bus controller
Data buffer
Bus controller
Data buffer
Bus controller
Data buffer
External bus I/FExternal bus I/FExternal bus I/F
External bus I/F External bus I/F External bus I/F