Question

Design a 4-bit loadable binary counter. This counter will increment every clock cycle if the Ld signal is low. If the Ld signal is high, it should load the parallel inputs. Your module should have the following inputs:

- D: 4-bit parallel input
- Ld: when high, the counter will read the inputs at the next clock edge.
- Clk: a periodic clock signal Your module should output the values of Q (4-bits)

Answer 1

To design a 4-bit loadable binary counter, you can use D flip-flops with parallel load capability. The counter will increment every clock cycle if the Ld signal is low, and it will load the parallel inputs if the Ld signal is high.

Step-by-step explanation:

To design a 4-bit loadable binary counter, you can use D flip-flops with parallel load capability. The counter will increment every clock cycle if the Ld signal is low, and it will load the parallel inputs if the Ld signal is high. Here's a basic implementation:

1. Connect the D input of each flip-flop to the corresponding bit of the parallel input D.
2. Connect the Q outputs of the flip-flops to a 4-bit output bus Q.
3. Connect the Ld signal to the parallel load enable (PE) input of each flip-flop, so that when Ld is high, the inputs D are loaded into the flip-flops.
4. Connect the Clk signal to the clock (CLK) input of each flip-flop, so that the flip-flops are clocked on each rising edge of Clk.

Here's an example truth table for this counter:

DLdClkQ00000Rising Edge000000001Rising Edge000000010Rising Edge000100011Rising Edge000000100Rising Edge001000101Rising Edge0000