ZiLOG Z80 User Manual page 47

Hide thumbs Also See for Z80:
Table of Contents

Advertisement

$GGLQJ 5$0
0RVW FRPSXWHU V\VWHPV UHTXLUH VRPH H[WHUQDO 5HDG:ULWH PHPRU\ IRU GDWD
VWRUDJH DQG VWDFN LPSOHPHQWDWLRQ )LJXUH  LOOXVWUDWHV KRZ  E\WHV RI
VWDWLF PHPRU\ DUH DGGHG WR WKH SUHYLRXV H[DPSOH LQ )LJXUH  7KH PHPRU\
VSDFH LV DVVXPHG WR EH RUJDQL]HG DV IROORZV
,Q WKLV GLDJUDP WKH DGGUHVV VSDFH LV GHVFULEHG LQ KH[DGHFLPDO QRWDWLRQ
$GGUHVV ELW $ VHSDUDWHV WKH 520 VSDFH IURP WKH 5$0 VSDFH DOORZLQJ
WKLV DGGUHVV WR EH XVHG IRU WKH FKLS VHOHFW IXQFWLRQ )RU ODUJHU DPRXQWV RI
H[WHUQDO 520 RU 5$0 D VLPSOH 77/ GHFRGHU LV UHTXLUHG WR IRUP WKH
FKLS VHOHFWV
MREQ • RD
A
10
)LJXUH 
80
1 Kbyte ROM
256 Bytes RAM
A
–A
7
0
CE1
1K x 8
ROM
CE2
D
–D
7
0
520 DQG 5$0 ,PSOHPHQWDWLRQ
+DUGZDUH DQG 6RIWZDUH ,PSOHPHQWDWLRQ ([DPSOHV
Address:
0000H
03FFH
0400H
04FFFH
Address Bus
A
–A
7
0
RD
CE1
OD
256 x 4
RAM
WR
CE2
R/W
D
–D
3
0
Data Bus
< %27
7UGT U /CPWCN
A
–A
7
MRQ
RD
OD
256 x 4
A
RAM
WR
10
R/W
D
–D
7

0
MRQ
CE1
A
CE2
10
4

Advertisement

Table of Contents
loading

Table of Contents