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FUJITSU MB91460 SERIES FR60 User Manual

Page 393

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377

Chapter 26 DMA Controller

5.Data Bus

Flow of Data During Fly-By Transfer

Figure 5-2

"Examples of Fly-By Transfer" shows examples of two types of transfer during fly-by transfer.

D-bus

X-bus

I-bus

F-bus

D-bus

X-bus

I-bus

F-bus

Bus controller

DMAC

RAM

CPU

MB91460

IO

Bus controller

DMAC

RAM

CPU

MB91460

IO

D-bus

X-bus

I-bus

F-bus

D-bus

X-bus

I-bus

F-bus

Bus controller

DMAC

RAM

CPU

MB91460

IO

Bus controller

DMAC

RAM

CPU

MB91460

IO

D-bus

X-bus

I-bus

F-bus

D-bus

X-bus

I-bus

F-bus

Bus controller

DMAC

RAM

CPU

MB91460

IO

Bus controller

DMAC

RAM

CPU

MB91460

IO

Read cycle

Read cycle

Read cycle

Write cycle

Write cycle

Write cycle

Built-in I/O area => internal RAM area transfer

Internal RAM area => external area transfer

Internal RAM area => built-in I/O area transfer

External bus I/F

External bus I/F

External bus I/F

External bus I/F

External bus I/F

External bus I/F

Data buffer

Data buffer

Data buffer

Data buffer

Data buffer

Data buffer