Register Chip
1. Register Chip
The Register is a 16-bit storage unit. It stores a 16-bit value and either maintains the stored value or updates it based on the load control bit.
2. Truth Table
| in (16-bit) | load | out (16-bit) | Notes |
|---|---|---|---|
| 0000000000000000 | 0 | previous value | Holds previous 16-bit value |
| 1111111111111111 | 0 | previous value | No update, holds previous value |
| 1010101010101010 | 1 | 1010101010101010 | Updates with new input value |
| 0000000000000000 | 1 | 0000000000000000 | Updates with all 0s |
3. Implementation (HDL)
The Register chip is built using 16 Bit chips — one for each bit of the 16-bit value.
CHIP Register {
IN in[16], load;
OUT out[16];
PARTS:
Bit(in=in[0], load=load, out=out[0]);
Bit(in=in[1], load=load, out=out[1]);
Bit(in=in[2], load=load, out=out[2]);
Bit(in=in[3], load=load, out=out[3]);
Bit(in=in[4], load=load, out=out[4]);
Bit(in=in[5], load=load, out=out[5]);
Bit(in=in[6], load=load, out=out[6]);
Bit(in=in[7], load=load, out=out[7]);
Bit(in=in[8], load=load, out=out[8]);
Bit(in=in[9], load=load, out=out[9]);
Bit(in=in[10], load=load, out=out[10]);
Bit(in=in[11], load=load, out=out[11]);
Bit(in=in[12], load=load, out=out[12]);
Bit(in=in[13], load=load, out=out[13]);
Bit(in=in[14], load=load, out=out[14]);
Bit(in=in[15], load=load, out=out[15]);
}