1 / 15

Logic Design LAB 4

Logic Design LAB 4. 授課老師：伍紹勳 課程助教：邱麟凱、江長庭. BCD Adder. Outlines Requirement Binary and Decimal LAB 4-bit binary full adder Combinational logic of BCD decoder BCD Adder BCD-to-7-Segment Decoders 7-Segment LED. Requirement.

kenny
Télécharger la présentation

Logic Design LAB 4

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Logic Design LAB 4 授課老師：伍紹勳課程助教：邱麟凱、江長庭

  2. BCD Adder • Outlines • Requirement • Binary and Decimal • LAB • 4-bit binary full adder • Combinational logic of BCD decoder • BCD Adder • BCD-to-7-Segment Decoders • 7-Segment LED

  3. Requirement • IC：7408 x 1、7432 x 1、7483 x 2、7447(DCBA) x 1、LED x 1、7-Segment LED x 1

  4. Binary and Decimal • Binary • 4-bit binary digits can represent 16 different numbers (0~15) • Easy to compute in digital circuit • Binary-Coded Decimal(BCD) • A decimal digit can represent10 different numbers (0~9) • Using 4-bit binary digits to represent a decimal digit • Familiar to most people

  5. LAB BCD Adder BCD-to-7-Segment Decoders 4-bit Binary Full Adder Combinational logic

  6. 4-bit Binary Full Adder • 74LS83

  7. Combinational logic of BCD decoder • Input 0≦A, B ≦9→ Output 0≦A+B ≦18 • If A+B = 0~9 • Output Carry = 0,Sum = A+B • If A+B = 10~18 • Output Carry = 1, Sum = A+B+6

  8. Combinational logic of BCD decoder • ex: 7+8=15 BCD : 0 1 1 1 +1 0 0 0 1 1 1 1 +0 1 1 0 1 0 1 0 1 >9 => add 6

  9. Binary Sum BCD Sum K T8 T4 T2 T1C S8 S4 S2 S1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 1 2 0 0 0 1 0 0 0 0 1 0 2 3 0 0 0 1 1 0 0 0 1 1 3 4 0 0 1 0 0 0 0 1 0 0 4 5 0 0 1 0 1 0 0 1 0 1 5 6 0 0 1 1 0 0 0 1 1 0 6 7 0 0 1 1 1 0 0 1 1 1 7 8 0 1 0 0 0 0 1 0 0 0 8 9 0 1 0 0 1 0 1 0 0 1 9 A 0 1 0 1 0 1 0 0 0 0 10 B 0 1 0 1 1 1 0 0 0 1 11 C 0 1 1 0 0 1 0 0 1 0 12 D 0 1 1 0 1 1 0 0 1 1 13 E 0 1 1 1 0 1 0 1 0 0 14 F 0 1 1 1 1 1 0 1 0 1 15 10 1 0 0 0 0 1 0 1 1 0 16 11 1 0 0 0 1 1 0 1 1 1 17 12 1 0 0 1 0 1 1 0 0 0 18 13 1 0 0 1 1 1 1 0 0 1 19 T2T1 00 01 11 10 00 01 11 1 1 1 1 10 1 1 T8T4 When to add 6? 1) T8 T4 T2 T1 > 9 T8T4 + T8T2 2) Carry is 1 F = T8T4 + T8T2 + K

  10. BCD Adder T8T4 + T8T2 + K Add 6 or not

  11. BCD-to-7-Segment Decoders • 74LS47 Don’t care

  12. a b f g e c dp d 7-Segment LED • Type “common anodes” seven-segment LED • Common anode pin ‘A’ and ‘k’ connect toVCC • LED illuminate when it’s input pin is low • Reference • http://zh.wikipedia.org/wiki/%E4%B8%83%E5%8A%83%E7%AE%A1

  13. 7-Segment LED 330Ω(橘橘棕)

  14. 7-Segment LED

  15. Input T8T4 + T8T2 + K Add 6 or not A,k connect to +5V and dp don’t care Sum Carry ( LED )

More Related