$2\mathrm{.}3$ Exercise $3$

Change mode String bit LED circuit.

Use Verilog HDL to model a state machine for a circuit that changes display mode of a bit string.

In initial, LEDs show the default $4-$bit random string which is performed by a reset signal, example

string: $0011.$ And buttons in board will set the display mode as follow:

Logic Design with HDL $-$ Semester $2222/3$

Faculty of Computer Science and Engineering Department of Computer Engineering

$$ Button $0$: Mode Reset: Show the default $4-$bit string on LEDs.

$$ Button $1$: Mode Circular Shift Left Ring : Shift $4-$bit string to left in a ring every $1$s$.$

$$ Button $2$: Mode Circular Shift Right Ring: Shift $4-$bit string to right in a ring every $1$s$.$

$$ Button $3$: Pause: Pause the current shifting string.

Draw a state diagram to illustrate the designed FSM$.$ Student can use Moore or Mealy model.

Write a test bench to simulate the circuit and test the circuit on the Arty$-$Z$7$ board.

Hint: Students should do the following steps:

$$ Partitioning the design into blocks, may draw a block diagram. Separate the state machine and the

string display logic.

$$ Define the inputs, outputs of the FSM$,$ then design the FSM$.$

$$ Modeling the FSM using Verilog HDL$.$ Use the FSM$$s outputs to control the string display.

$$ Simulate and test the circuit on board. $2\mathrm{.}3$ Exercise $3$

Change mode String bit LED circuit.

Use Verilog HDL to model a state machine for a circuit that changes display mode of a bit string.

In initial, LEDs show the default $4-$bit random string which is performed by a reset signal, example

string: $0011.$ And buttons in board will set the display mode as follow:

Logic Design with HDL $-$ Semester $222$

Button $0$: Mode Reset: Show the default $4-$bit string on LEDs.

Button $1$: Mode Circular Shift Left Ring : Shift $4-$bit string to left in a ring every $1$s$.$

Button $2$: Mode Circular Shift Right Ring: Shift $4-$bit string to right in a ring every $1$s$.$

Button $3$: Pause: Pause the current shifting string.

Draw a state diagram to illustrate the designed FSM$.$ Student can use Moore or Mealy model.

Write a test bench to simulate the circuit and test the circuit on the Arty$-$Z$7$ board.

Hint: Students should do the following steps:

Partitioning the design into blocks, may draw a block diagram. Separate the state machine and the

string display logic.

Define the inputs, outputs of the FSM$,$ then design the FSM$.$

Modeling the FSM using Verilog HDL$.$ Use the FSM$\text{'}$s outputs to control the string display.

Simulate and test the circuit on board.