2.3. Shift Register Counters: Johnson counter (1.8 marks) Refer to Section 8.4 in Lecture Notes, build a 2-bit Johnson c

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2 3 Shift Register Counters Johnson Counter 1 8 Marks Refer To Section 8 4 In Lecture Notes Build A 2 Bit Johnson C 1 (314.78 KiB) Viewed 60 times

2.3. Shift Register Counters: Johnson counter (1.8 marks) Refer to Section 8.4 in Lecture Notes, build a 2-bit Johnson counter to turn on two LEDs one-by-one, then turn off them one-by-one. The counting sequence is 00, 10, 11, 01, 00, .... Use 74LS74 D flip- flops for the circuit. 2 2D 2 CLOCK PRESET 20 20 Vcc CLEAR 19 13_12_1 11 10 9 8 [R2.3.1] (0.3 mark) On Breadboard, construct the 2-bit Johnson counter. Report the circuit connection (wiring diagram) using the provided 74LS74 pinout: (Use the IC pinout to draw connections of your circuit) PRESET o a CLEAR 0 PCK CK 0 CLEAR PRESET Note: The two CLEAR pins need to be LOW to clear the counter, then switch to HIGH to be ready for the counting from 00 state (Step0). The two PRESET pins can be left floating. 1 2 HITA 5 GO 10 10 10 GND 1 CLEAR 1 1 CLOCK PRESET [R2.3.2] (0.7 mark) Record the sequence states of the outputs at each stage, and complete the following sequence truth table. What is the modulus of this counter?