Data Bus - Fujitsu MB91460 SERIES FR60 User Manual

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)
MB91460
Read cycle
I-bus
D-bus
MB91460
Read cycle
I-bus
D-bus
MB91460
Read cycle
I-bus
D-bus
376
External area => external area transfer
DMAC
X-bus
Bus controller
Data buffer
F-bus
RAM IO
External area => internal RAM area transfer
DMAC
X-bus
Bus controller
Data buffer
F-bus
RAM IO
External area => built-in I/O area transfer
DMAC
X-bus
Bus controller
Data buffer
F-bus
RAM IO
MB91460
DMAC
Write cycle
I-bus
Bus controller
D-bus Data buffer
F-bus
RAM
MB91460
DMAC
Write cycle
I-bus
Bus controller
D-bus
Data buffer
F-bus
RAM
MB91460
DMAC
Write cycle
I-bus
Bus controller
Data buffer
D-bus
F-bus
RAM
X-bus
IO
X-bus
IO
X-bus
IO