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ti : Thit k mch chuyn m BCD 8421 qua GRAY

Phn I: 4

I.1. Nhim v ca sinh vin:

Nm chc l thuyt i S Boole, cc nh l logic, cc cng logic, ng thcchun tc tuyn, phng php ti gin logic biu thc logic bng nh l logic vbng bng Karnaugh.

I.2. Ti liu hc tp:

C S k thut in t ci PVC / mn in t-i hc Thanh HoaBc Kinh. Nh xut bn Gio Dc (1996).

Thit k mch logic ci Nguyn Thy Vn. Nh xut bn khoa hc k

thut So snh (1996).

K thut in S t-TS ng Vn Chuyt-Nh xut bn Gio Dc(1998)Bi ging K thut xung S.

I.3. Yu cu

Phn tch bi tp c giao xy bng phn cng tc cho mch logicthit k c th.

Lp Biu thc logic cho cc u ra.

Tin hnh ti gin biu thc logic (dng ca 2 phng php nh llogic v bng kasnaugh)

Thit k mch chuyn i m tt c cc dng logic: OR - AND, AND- OR, NOR - AND, NOR - NOR So snh NAND - NAND.

V mch logic.

M phng mch logic bng C.

I.4. bi

Thit k mch chuyn m t BCD8421 sang GRAY

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Phn II: BI GII

II.1. Phn tch bi tp

BCD 8421 GRAY

A B C DC s

10 F1 F2 F3 F40 0 0 0 0 0 0 0 00 0 0 1 1 0 0 0 10 0 1 0 2 0 0 1 1

0 0 1 1 3 0 0 1 00 1 0 0 4 0 1 1 00 1 0 1 5 0 1 1 10 1 1 0 6 0 1 0 10 1 1 1 7 0 1 0 01 0 0 0 8 1 1 0 01 0 0 1 9 1 1 0 11 0 1 0 X 1 1 1 11 0 1 1 X 1 1 1 01 1 0 0 X 1 0 1 0

1 1 0 1 X 1 0 1 11 1 1 0 X 1 0 0 11 1 1 1 X 1 0 0 0

Mi ct a,b,c,d l mt hm ca A,B,C,D

CODER

A

BC

D

F1

BC

D

BCD 8421 GRAY

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II.2 Biu thc logic u ra1.Tng cc tch:

F4 = + A ;

a. Tch cc tng:F1 = (A + B + C + D)(A + B + C + )(A + B + )(A + B + + D)(A +

+ D)

F2 = (A + B + C + D)(A + B + C + )(A + B + )(A + B + + D)

F3 = (A + B + C + D)

(A + B + C

+

F4 = (A + B + C + D)(A + B +