On write enable, the four data-inputs are saved to the d-flipflops selected by the address inputs. The output is always read from the current selected flipflops.
Connect a clock, buttons for reset and write_enable and switches for address and data like shown below. The output can be read by using 4 LEDs or any other kind of binary output device.
| # | Input | Output |
|---|---|---|
| 0 | clock | data1 |
| 1 | reset | data2 |
| 2 | write_enable | data3 |
| 3 | addr1 | data4 |
| 4 | addr2 | none |
| 5 | data1 | none |
| 6 | data2 | none |
| 7 | data3 | none |