1 / 14

Encoders

Encoders. Lecture L6.11 Section 6.4. Encoders. Encoders Priority Encoders TTL Encoders. I0. 4-to-2 . I1. A . Encoder . I2. B . I3. Encoders. I0 I1 I2 I3 B A. 1 0 0 0 0 0 0 1 0 0 0 1 0 0 1 0 1 0 0 0 0 1 1 1. I0. I1. A = I1 # I3. I2.

iman
Download Presentation

Encoders

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. Encoders Lecture L6.11 Section 6.4

  2. Encoders • Encoders • Priority Encoders • TTL Encoders

  3. I0 4-to-2 I1 A Encoder I2 B I3 Encoders I0 I1 I2 I3 B A 1 0 0 0 0 0 0 1 0 0 0 1 0 0 1 0 1 0 0 0 0 1 1 1

  4. I0 I1 A = I1 # I3 I2 B = I2 # I3 I3 Encoders Assume only 1 input can be high at any time. I0 I1 I2 I3 B A 1 0 0 0 0 0 0 1 0 0 0 1 0 0 1 0 1 0 0 0 0 1 1 1 A = I1 # I3 B = I2 # I3

  5. I0 I1 I2 I3 I4 I5 I6 I7 Y2 Y1 Y0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 1 1 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 1 0 0 1 0 1 0 0 0 0 0 0 1 0 1 1 0 0 0 0 0 0 0 0 1 1 1 1 8-to-3 Encoder Y2 = I7 # I6 # I5 # I4 Y1 = I7 # I6 # I3 # I2 Y0 = I7 # I5 # I3 # I1

  6. encoder.abl MODULE encoder83 TITLE 'Encoder, D. Hanna, 7/15/02' DECLARATIONS " INPUT PINS " I7..I0 PIN 11, 7, 6, 5, 4, 3, 2, 1; " Switch 1..8 " OUTPUT PINS " Y2..Y0 PIN 41, 43, 44 ISTYPE 'com'; " LED 14..16 EQUATIONS Y2 = I7 # I6 # I5 # I4; Y1 = I7 # I6 # I3 # I2; Y0 = I7 # I5 # I3 # I1; END encoder83

  7. Priority Encoder I0 I1 I2 I3 I4 I5 I6 I7 Y2 Y1 Y0 1 0 0 0 0 0 0 0 0 0 0 X 1 0 0 0 0 0 0 0 0 1 X X 1 0 0 0 0 0 0 1 0 X X X 1 0 0 0 0 0 1 1 X X X X 1 0 0 0 1 0 0 X X X X X 1 0 0 1 0 1 X X X X X X 1 0 1 1 0 X X X X X X X 1 1 1 1

  8. Priority Encoder I0 I1 I2 I3 I4 I5 I6 I7 Y2 Y1 Y0 1 0 0 0 0 0 0 0 0 0 0 X 1 0 0 0 0 0 0 0 0 1 X X 1 0 0 0 0 0 0 1 0 X X X 1 0 0 0 0 0 1 1 X X X X 1 0 0 0 1 0 0 X X X X X 1 0 0 1 0 1 X X X X X X 1 0 1 1 0 X X X X X X X 1 1 1 1 Y2 = L7 # L6 # L5 # L4 L7 = I7 L6 = !I7 & I6 L5 = !I7 & !I6 & I5 L4 = !I7 & !I6 & !I5 & I4

  9. Priority Encoder I0 I1 I2 I3 I4 I5 I6 I7 Y2 Y1 Y0 1 0 0 0 0 0 0 0 0 0 0 X 1 0 0 0 0 0 0 0 0 1 X X 1 0 0 0 0 0 0 1 0 X X X 1 0 0 0 0 0 1 1 X X X X 1 0 0 0 1 0 0 X X X X X 1 0 0 1 0 1 X X X X X X 1 0 1 1 0 X X X X X X X 1 1 1 1 Y1 = L7 # L6 # L3 # L2 L7 = I7 L6 = !I7 & I6 L3 = !I7 & !I6 & !I5 & !I4 & I3 L2 = !I7 & !I6 & !I5 & !I4 & !I3 & I2

  10. Priority Encoder I0 I1 I2 I3 I4 I5 I6 I7 Y2 Y1 Y0 1 0 0 0 0 0 0 0 0 0 0 X 1 0 0 0 0 0 0 0 0 1 X X 1 0 0 0 0 0 0 1 0 X X X 1 0 0 0 0 0 1 1 X X X X 1 0 0 0 1 0 0 X X X X X 1 0 0 1 0 1 X X X X X X 1 0 1 1 0 X X X X X X X 1 1 1 1 Y0 = L7 # L5 # L3 # L1 L7 = I7 L5 = !I7 & !I6 & I5 L3 = !I7 & !I6 & !I5 & !I4 & I3 L1 = !I7 & !I6 & !I5 & !I4 & !I3 & !I2 & I1

  11. pencoder.abl MODULE pencoder83 TITLE 'Priority Encoder' DECLARATIONS " INPUT PINS " I0..I7 PIN 11, 7, 6, 5, 4, 3, 2, 1; " Switch 1..8 " OUTPUT PINS " Y2..Y0 PIN 41, 43, 44 ISTYPE 'com'; " LED 14..16 VALID PIN 35; " LED 9 " VALID = 1 for valid binary output

  12. pencoder.abl (cont’d) " Definitions " L7 = I7; L6 = !I7 & I6; L5 = !I7 & !I6 & I5; L4 = !I7 & !I6 & !I5 & I4; L3 = !I7 & !I6 & !I5 & !I4 & I3; L2 = !I7 & !I6 & !I5 & !I4 & !I3 & I2; L1 = !I7 & !I6 & !I5 & !I4 & !I3 & !I2 & I1; EQUATIONS Y2 = L7 # L6 # L5 # L4; Y1 = L7 # L6 # L3 # L2; Y0 = L7 # L5 # L3 # L1; END pencoder83

  13. 1 16 Vcc 4 2 15 5 E0 3 14 6 GS 4 13 7 3 5 12 E1 2 6 11 A2 1 7 10 A1 0 8 9 A0 GND 74LS148 TTL Encoder EI 0 1 2 3 4 5 6 7 A2 A1 A0 GS EO 1 X X X X X X X X 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 0 0 X X X X X X X 0 0 0 0 0 1 0 X X X X X X 0 1 0 0 1 0 1 0 X X X X X 0 1 1 0 1 0 0 1 0 X X X X 0 1 1 1 0 1 1 0 1 0 X X X 0 1 1 1 1 1 0 0 0 1 0 X X 0 1 1 1 1 1 1 0 1 0 1 0 X 0 1 1 1 1 1 1 1 1 0 0 1 0 0 1 1 1 1 1 1 1 1 1 1 0 1 Priority Encoder

  14. 68000 Interrupt Logic A0 A1 A2 74138 Decoder 68000 IRQA IP0 IP1 IP2 74148 Encoder Peripheral IRQ Data Bus

More Related