Download - Lab 5 - Sol
-
B mn K thut my tnh Khoa Khoa hc v K thut my tnh
BI TN 06: MCH M BT NG B I. Mc ch bi th nghim
- Thit k mch m bt ng b bng D flip flop. - Thit k mch m bt ng b bng JK flip flop.
II. Ni dung chun b trc - Kho st hot ng ca IC 74LS73, 74LS74. - Quy trnh thit k b m bt ng b. - Phn l thuyt cc bi o s 1, 2, 3, 4, 5, 6.
III. Bi o Bi o s 1: mch m bt ng b 2 bit
Cho mch nh hnh v:
B
CLK
2
3
5
6
41
D
CLK
Q
Q
PR
EC
LR
A
VCC
VCC
12
11
9
8
1013
D
CLK
Q
Q
PR
EC
LR
Gi s ban u BA = 00, s chuyn trng thi ca mch (A l LSB):
Sinh vin nhn xt mch trn lm nhim v:
Rp mch, so snh kt qu thc nghim vi l thuyt. Gii thch v khc phc nguyn nhn dn ti s khc bit (nu c).
Thay i mch trn, ly ng ra l Q nh hnh v:
Hc k II/2014-2015 Trang 1 o Nguyn Quc Vinh - 1414674
m t 3 v 0.
-
B mn K thut my tnh Khoa Khoa hc v K thut my tnh
CLK
VCC
12
11
9
8
1013
D
CLK
Q
Q
PR
EC
LR
BA
VCC
2
3
5
6
41
D
CLK
Q
Q
PR
EC
LR
Gi s ban u BA = 00, s chuyn trng thi ca mch:
Sinh vin nhn xt mch trn lm nhim v:
Rp mch, so snh kt qu thc nghim vi l thuyt. Gii thch v khc phc nguyn nhn dn ti s khc bit (nu c).
Thay i mch, ly chn Q kch tn hiu CLK nh hnh v:
BVCC
A
12
11
9
8
1013
D
CLK
Q
Q
PR
EC
LRCLK
VCC
2
3
5
6
41
D
CLK
Q
Q
PR
EC
LR
Gi s ban u BA = 00, s chuyn trng thi ca mch:
Sinh vin nhn xt mch trn lm nhim v:
Rp mch, so snh kt qu thc nghim vi l thuyt. Gii thch v khc phc nguyn nhn dn ti s khc bit (nu c).
Thay i mch, ly d liu xut ra l Q nh hnh v:
Hc k II/2014-2015 Trang 2 o Nguyn Quc Vinh - 1414674
m t 3 v 0.
m t 3 v 0.
-
B mn K thut my tnh Khoa Khoa hc v K thut my tnh
CLK
U1A
7474
2
3
5
6
41
D
CLK
Q
Q
PR
EC
LR
U1B
7474
12
11
9
8
1013
D
CLK
Q
Q
PR
EC
LR
A
VCC
VCCB
Gi s ban u BA = 00, s chuyn trng thi ca mch:
Sinh vin nhn xt mch trn lm nhim v:
Rp mch, so snh kt qu thc nghim vi l thuyt. Gii thch v khc phc nguyn nhn dn ti s khc bit (nu c).
Sinh vin rt ra kt lun v mi tng quan gia b m ln/xung vi ng ra l Q/Q, chn kch clock Q/Q, clock tch cc cnh ln/xung:
Bi o s 2: mch m bt ng b 4 bit Da trn bi o s 1, sinh vin thit k mch m ln bt ng b 4 bit, m t 0 n 15 bng
hai IC 74LS74.
Mch:
Rp mch, so snh kt qu thc nghim vi l thuyt. Gii thch v khc phc nguyn nhn dn ti s khc bit (nu c).
Bi o s 3: kho st b m bt ng b
Hc k II/2014-2015 Trang 3 o Nguyn Quc Vinh - 1414674
m t 3 v 0.
m t 2n1 v 0 vi n l s D Latch.
-
B mn K thut my tnh Khoa Khoa hc v K thut my tnh
Cho mch nh hnh v:
C
12
11
9
8
1013
D
CLK
Q
Q
PR
EC
LRCLK
DB
9
108
VCCA
2
3
5
6
41
D
CLK
Q
Q
PR
EC
LR
1
23
4
56
12
11
9
8
1013
D
CLK
Q
Q
PR
EC
LR
2
3
5
64
1D
CLK
Q
QP
RE
CLR
Gi s ban u DCBA = 00, s chuyn trng thi ca mch (A l LSB):
Sinh vin nhn xt mch trn lm nhim v:
Rp mch, so snh kt qu thc nghim vi l thuyt. Gii thch v khc phc nguyn nhn dn ti s khc bit (nu c).
Bi o s 4: thit k b m bt ng b Da trn bi o s 3, sinh vin thit k mch m ln bt ng b t 0 n 12 bng 2 IC
74LS74 v 1 IC 74LS00
Mch:
Rp mch, so snh kt qu thc nghim vi l thuyt. Gii thch v khc phc nguyn nhn dn ti s khc bit (nu c).
Bi o s 5: thit k b m bt ng b
Hc k II/2014-2015 Trang 4 o Nguyn Quc Vinh - 1414674
Mch sai
m t 15 v 12 ri reset v 0.
-
B mn K thut my tnh Khoa Khoa hc v K thut my tnh
Da trn cc bi o trc, sinh vin thit k mch m ln bt ng b 4 bit, m t 0 n 15 bng hai IC 74LS73.
Mch:
Rp mch, so snh kt qu thc nghim vi l thuyt. Gii thch v khc phc nguyn nhn dn ti s khc bit (nu c).
Sinh vin lu v tr chn ngun, chn t ca IC 74LS73
Bi o s 6: thit k b m bt ng b Sinh vin thit k mch m ln bt ng b t 0 n 12 bng 2 IC 74LS73 v 1 IC 74LS00
Mch:
Rp mch, so snh kt qu thc nghim vi l thuyt. Gii thch v khc phc nguyn nhn dn ti s khc bit (nu c).
IV. Bi tp lm thm Bi o s 1: thit k mch m xung bt ng b
Thit k v rp mch m xung t 15 n 0 bng 2 IC 74LS74.
Hc k II/2014-2015 Trang 5 o Nguyn Quc Vinh - 1414674
-
B mn K thut my tnh Khoa Khoa hc v K thut my tnh
Thit k v rp mch m xung t 15 n 7 bng 2 IC 74LS74 v 1 IC 74LS00.
Bi o s 3*: trng hp c bit ca b
m xung Thit k v rp mch m xung t 10 n 0.
-
Gii thch l do kt qu thc nghim chy khc vi thit k*.
-
ra gii php khc phc.
-
Rt ra kt lun v gi tr
m khng nn s dng trong b
m xung bt ng b.
-
Rt ra kt lun v gi tr
m khng nn s dng trong b
m ln bt ng b.
Bi o s 2: thit k mch m xung bt ng b
Mch:
Mch:
Mch:
Hc k II/2014-2015 Trang 6 o Nguyn Quc Vinh - 1414674
