Decodes addresses and stores the bits using multiplexers.
To write set the 3 data bits (WriteData0-WriteData2), address of the register to be written to (WriteAddress0/WriteAddress1) and toggle WriteEnable to write the 3-bits to the register at address. To read data set the address of the register to read (ReadAddress0/ReadAddress1) and the data is output on Data0-Data2. The internal state for Data2 at all addresses and an inverted WriteEnable is also output.
| # | Input | Output |
|---|---|---|
| 0 | WriteData0 | OutData0 |
| 1 | WriteData1 | Data2Address0 |
| 2 | WriteData2 | Data2Address1 |
| 3 | WriteAddress0 | OutData2 |
| 4 | Writeaddress0 | Data2Address2 |
| 5 | WriteEnable | Data2Address3 |
| 6 | ReadAddress0 | OutData1 |
| 7 | ReadAddress1 | NotWriteEnable |