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2 block diagram – FUJITSU MB91460 SERIES FR60 User Manual

Page 525

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509

Chapter 31 External Bus

1.Overview of the External Bus Interface

1.2 Block Diagram

Figure 1-1 Block Diagram of the External Bus Interface

32

32

Internal address bus

Internal data bus

write buffer

switch

switch

read buffer

ADDRESS BLOCK

DATA BLOCK

+1 or +2

address buffer

ASZ

ASR

BRQ
BGRNT
RDY

RD
WR0,WR1,
WR2,WR3,
AS,BAA

SRAS,SCAS,
SWE,MCLKE,
DQMUU,DQMUL,
DQMLU,DQMLL

CS0

CS7

MUX

all-block control

registers

control

comparator

SDRAM control

RCR

refresh counter

underflow

External data bus

External address bus

External terminal controller