Tài liệu Chương 14: Phối ghép 8031/51 với bộ nhớ ngoài docx

Ch"ơng 14
Phối phép 8031/51 với bộ nhớ ngoài
14.1 Bộ nhớ bán dẫn.
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bcd .) bed 0'@$% +, 6)[ f5g$ 3 [9+ QN +'5H+ $%W f5,$ +"h$% 0'5$% 0'# +K+ 0L
[h3 89 $'- 81$ :;$ $'A 6) :5$% 6AC$%D +E 0'F0 .) +N0 <9I
14.1.1 Dung l"ợng nhớ.
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[1* +>$' 65]$ <AC0 0'# +>$' 8*+gI X't$% '7$D +"P$ +7& 0'> 2u +'5H+ 0_ [9+ 8)3 81#
$_3 "v$% 0'>& wxd <a +"y $P$ &'E :B$% +'T [=0 :U $_ 2']$% $_3 "v$% wxd $%'z, 6)
wx [Pk%,k83+ +'T $_ .;$ <AC0 '345 6) 8)3 81# $_3 ./ 0'>& rX $'-I !5* $'3P$D $J5 [9+
f5L$% 01# $_3 "v$% [9+ [1* +>$' 3 89 $'- wxd .T $_ <,$% $_3 ./ 'M +'N$% [1*
+>$' $P$ $_ <AC0 '345 wxd 0_ $%'z, 6) wx [Pk%,k8*+gI
14.1.2 Tổ chức bộ nhớ.
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$%{$ $'- 0_ 0'F, 89 8>+D } 8>+D ~ 8>+ +'H[ 0'> <J$ wx 8>+ &'B +'590 .)# 010' $_ <AC0
+'3J+ 2J 8P$ +"#$% $'A +'J $)# iN 8>+ [) [|3 $%{$ $'- 8P$ +"#$% 0'>& $'- 0_ +'4
0'F, <AC0 65]$ 8v$% QN 0'q$ :W 63M5 +"P$ 0'>&I ^H* 0_ 8,# $'3P5 $%{$ $'- 8P$
+"#$% [9+ 0'>& $'- N_ &'B +'590 .)# QN 0'q$ <j, 0'`D QN $%{$ $'- 8P$ +"#$% [9+
rX $'- 65]$ 8v$% 2 65u +'ừ, 3 QN 0'q$ <j, 0'`I D# .H*D +E$% QN 8>+ [) rX $'- 0_
+'4 6A5 +"W 6) 8v$% QN $%{$ $'- $'q$ 3 8>+ :W 63M5 +"P$ [|3 $%{$ $'-I X_ +'4 +_[

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14.1.3 Tốc độ.
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63M5 0?, $_I p4 +"5* 0H& :W 63M5 +'T <j, 0'` &'L3 0_ y 010 0'q$ <j, 0'`,D 0'q$ <h0
bEeD <AC0 +>0' 0O0 .) Q,5 [9+ 2'#L$% +'G3 %3,$ +'T :W 63M5 Qẽ x5K+ '3M$ y 010 0'q$
:W 63M5I m'#L$% +'G3 %3,$ $)* 0)$% $%ắ$ 0)$% +N+ .) +K+ $'3P$ 6) 0'>& $'- 0)$% <ắ+I
!N0 <9 0?, 0'>& $'- +'AG$% <AC0 0#3 $'A 6) +'G3 %3,$ +"5* 0H& 0?, $_I !'G3 %3,$ +"5*
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.)# 0]$% $%'M QR :B$% +"#$% f51 +"T$' +'3J+ 2J .) QL$ x5K+ rXI
XL 8, <=0 +>$' f5,$ +"h$% 0?, 89 $'- 6) :5$% 6AC$% $'-D +E 0'F0 89 $'- .)
+'G3 %3,$ +"5* 0H& Qẽ <AC0 QR :B$% $'3/5 +"#$% 0'AV$% +"T$'I BL$% w}Iw $'A [9+
+',[ 0'3J5 <4 +>$' +#1$ 010 <=0 +>$' 0?, 89 $'-I X10 .> :B w}Iw .) w}I2 QÏ [3$' '#7
$'W$% 2'13 $3M[ .õ, +"T$' 8)*I
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VÝ dô 14.1:
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:5$% 6AC$% $'- 0?, $_I
Lêi gi¶i:
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w2
= }09xn .) [|3 $%{$ $'- 0'F, } 8>+ :W 63M5
$P$ +E 0'F0 $'- 0?, $_ 6) }09x
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8n D5$% 6AC$% $'- 0?, 0'>& $'- 6) wxm .T 0_ } m $%{$ $'- .) [|3 $%{$ $'- 0_ }
8>+ :W 63M5I
VÝ dô 14.2:
d9+ 0'>& $'- 5w22 0_ ~ 0'q$ :W 63M5I Ha* +T[ ,n +E 0'F0 0?, $_ .) 8n QN 0'q$
<j, 0'` 0?, 0'>& $)*I
Lêi gi¶i:
,n d9+ 0'>& 0_ ~ 0'q$ :W 63M5 0_ $%'z, 6) [|3 $%{$ $'- 0_ ~ 8>+ :W 63M5I iN $%{$

$'- +"P$ 0'>& $)* 8v$% :5$% 6AC$% $'- 0'3, 0'# QN 0'q$ :W 63M5 = 5w22/~ = x}I
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14.1.4 Bé nhí ROM.
B9 $'- bcd 6) 89 $'- 0'` <h0 lbg,: k #$6* dg[#"*nI pq* 6) [9+ 2345 89
$'- [) 2']$% [K+ 010 $93 :5$% 0?, $_ 2'3 +¾+ $%5å$I ^-3 6S :# $)* [) 89 $'-
bcd 0s$ <AC0 %h3 6) 89 $'- 2']$% 8,* 'V3D 0_ $'3/5 6#73 89 $'- bcd 2'10 $',5
$'A: YbcdD EYbcdD EEYbcdD EYbcd $',$' lf6,Q'n .) bcd 0'gI
14.1.4.1 Bé nhí PROM.
B9 $'- Ybcd 6) 89 $'- bcd 0_ +'4 6H& +"T$' <AC0I pq* 6) 6#73 89 $'- [)
$%AG3 :U$% 0_ +'4 <N+ %'3 +']$% +3$ .)#I ',* $_3 010' 2'10D Ybcd 6) 89 $'- $%AG3
:U$% 0_ +'4 6H& +"T$' <AC0I pN3 3 [|3 8>+ 0?, Ybcd 0_ [9+ 0(5 0'TI B9 $'-
Ybcd <AC0 6H& +"T$' 8v$% 010' 6)[ <F+ $'W$% 0(5 +"TI NJ5 +']$% +3$ <AC0 <N+ .)#
+"#$% Ybcd [) Q,5 +'T &'L3 8\ .T 010 0(5 +"T 0?, $_ 8P$ +"#$% 8j <F+ .z$' .3Ô$ 3
6S :# $)* [) Ybcd [) <AC0 %h3 6) 89 $'- bcd 6H& +"T$' [9+ 6($I ^3M0 6H& +"T$'
bcd 0ò$% <AC0 %h3 6) <N+ bcd .) $_ <s3 '\3 &'L3 0_ [9+ +'3J+ 8j <=0 83M+ %h3 6) 89
<N+ bcd ',* 0s$ %h3 6) +'3J+ 8j 6H& +"T$' bcdI
14.1.4.2 Bé nhí EPROM vµ UV - EPROM.
B9 $'- EYbcd <AC0 &'1+ [3$' ", <4 0'# &'Ð& +'O0 '3M$ +',* <E3 $93 :5$%
0?, Ybcd Q,5 2'3 $_ <a <AC0 <N+I !"#$% 89 $'- EYbcd +, 0_ +'4 6H& +"T$' 0'>&
$'- .) x#1 $_ ')$% $%'T$ 6($I p3/5 $)* 6) <=0 83M+ 0($ +'3J+ +"#$% f51 +"T$' &'1+
+"34$ [;5 +'R 0?, [9+ :O 1$ :O, +"P$ 89 .3 xR 6SI d9+ EYb QR :B$% "9$% "a3 <AC0
%h3 6) Z^ k EYbcd lZ^ 6) 0'W .3J+ +¾+ 0?, +3, 0O0 +>[ Z6+", k ^3#6g+nI ^K$ </ +å$
+73 :5* $'K+ 0?, Z^ k EYbcd 6) +'G3 %3,$ x#1 0?, $_ f51 6q5 l20 &'@+nI
!K+ 0L 010 0'>& $'- Z^ k EYbcd 0_ [9+ 0R, QE <AC0 :U$% <4 0'3J5 +3, 8F0
x7 0O0 +>[ x#1 010 $93 :5$% 0?, $_I ^-3 6S :# $)* [) EYbcd 0ò$% 0s$ <AC0 0#3

$'A 6) 89 $'- EYbcd <AC0 x#1 8v$% +3, 0O0 +>[ ',* <V$ %3L$ <AC0 %h3 6) Z^ –
EYbcdI HT$' w}Iw +"T$' 8)* 010 0'q$ 0?, [9+ 0'>& Z^ k EYbcdI
p4 6H& +"T$' 0'# [9+ Z^ k EYbcd 0($ +'O0 '3M$ 010 8A-0I
wI X#1 010 $93 :5$% 0?, $_D <4 x#1 [9+ 0'>& +'T &'L3 +'1# $_ ", 2'\3 <4 0¾[ +"P$
8L$% [70' 'M +'N$% .) <=+ $_ .)# +'3J+ 8j x#1 EYbcd <4 0'3J5 x7 +3, 0O0 +>[
2'#L$% w5 k 20 &'@+I
2I LH& +"T$' 0'# 0'>&I p4 6H& +"T$' 0'# [9+ 0'>& Z^ k EYbcd +'T <=+ $_ .)# +'3J+
8j <N+ l+'3J+ 8j 6H& +"T$' nI p4 <N+ 0'AV$% +"T$' .) :W 63M5 .)# EYbcd +'T +'3J+ 8j
<N+ bcd QR :B$% <3M$ 1& w2I5^ '#=0 0,# 'V$ &'B +'590 .)# 6#73 EYbcdI p3M$
1& $)* <AC0 %h3 6) ^&& +"#$% 8L$% :W 63M5 0?, Z^ k EYbcdI
3I L¾& 0'>& $'- +"y 673 <4 0¾[ +"P$ 'M +'N$%I
!õ 010 8A-0 +"P$ <q* +, +'K* 0ò$% $'A 010 +'3J+ 8j <N+ EYbcd +'T 0ò$% 0_
010 +'3J+ 8j x#1 EYbcd 2'10 $',5I ^) +K+ 0L 010 2345 89 $'- Z^ – EYbcd </5 0_
[9+ $'AC0 <34[ 0'>$' 6) 2']$% +'4 <AC0 6H& +"T$' +"O0 +3J& +"P$ 8L$% [70' 0?, 'M
+'N$%I D# .H*D 89 $'- EYbcd <a <AC0 ", <G3 <4 %3L3 f5*J+ .K$ </ $)*I
Ha* <4 S <J$ 010 2S '3M5 [a QN 0?, 010 rX +"#$% 8L$% w}I2I .> :BD [a QN 89
&'H$ 27w2~ k 25 :)$' 0'# Z^ k EYbcd 0_ :5$% 6AC$ .) +'G3 %3,$ +"5* 0H& 6)
250$QI D5$% 6AC$% 0?, 0'>& $'\ <AC0 2S '3M5 +"P$ [a QN 89 &'H$ l&,"+ $5[8g"n .)
+'G3 %3,$ +"5* 0H& <AC0 8\ <3 [9+ QN 0I !"#$% 010 [a QN 89 &'H$ +'T 0'W X 6) 09$%
$%'M XdciD 0s$ 27xx 65]$ 0'` 010 0'>& $'- EYbcdI p4 83J+ +'P[ 0'3 +3J+ +, .)#
[B0 QE +,* 010 0'>& $'- 0?, 010 'a$% 0't$% '7$ JedEXc lj,[g0#I0#[n ',* JDb
lj:"I0#[n +'g# <AG$% [7$% 3$+g"$g+I
B¶ng 14.2: d9+ QN 0'>& $'- Z^ k EYbcdI



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H×nh 14.1: BN +"> 010 0'q$ 0?, 'h 010 0'>& $'- bcd 27xxI
VÝ dô 14.3:
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14.1.4.3 Bé nhí PROM cã thÓ xo¸ ®"îc b»ng ®iÖn EEPROM.
B9 $'- EEYbcd 0_ [9+ QN A5 <34[ Q# 3 EYbcd 6) :# .T <AC0 x#1 8v$%
<3M$ $P$ f51 +"T$' x#1 "K+ $',$'D $',$' "K+ $'3/5 Q# 3 +'G3 %3,$ x#1 20 &'@+ 0?,
ZEYbcdI N%#)3 ", +"#$% EEYbcd +, &'L3 x#1 +#)$ 89 $93 :5$% 0?, bcdI !5*
$'3P$D A5 <34[ 0'>$' 0?, EEYbcd 6) +, 0_ +'4 6H& +"T$' .) x#1 2'3 0'>& $'- .;$ y
+"P$ %31 0¾[ 0?, 8L$% [70' 'M +'N$% [) 2']$% &'L3 6K* ", $'A <N3 3 Z^ –
EYbcdI H,* $_3 010' 2'10 6) EYbcd 2']$% 0($ +'3J+ 8j 6H& +"T$' .) +'3J+ 8j x#1
$%#)3 $'A <N3 3 Z^ k EYbcdI p4 '#)$ +#)$ +7# +'5H$ 6C3 0'# EYbcd $') +'3J+
2J &'L3 2J+ 'C& .)# 8L$% [70' 0?, 'M +'N$% 0L [70' <3M$ <4 6H& +"T$' EEYbcd QR
:B$% <3M$ 1& ^&& = 5^ $'A$% 0'@$% "K+ <¾+I $'T$ 0'5$%D %31 +')$' 0'# w 8>+ 0?,
EEYbcd <¾+ 'V$ "K+ $'3/5 Q# 3 Z^ k EYbcdI
B¶ng 14.3: d9+ QN 0'>& EEYbcd .) 0'>& $'- F6,Q' l$',$'nI


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