14 Memory Banking
Components¶
2704¶
2704 is ROM chip
two has W Inverted W is M It also has o, so ROM
LS138¶
\(3 \times 8\) decoder
The other one will be ram chip We don’t need the entire memory, so we instead use in different way.
| \(O_0\) | ROM1 |
| \(O_3\) | RAM1 |
| \(O_4\) | RAM2 |
Blah¶
| \(O_0\) | \(A_0\) | \(\overline{BHE}\) | Even | Odd |
|---|---|---|---|---|
| 0 | 0 | 0 | ✅ | ✅ |
| 0 | 0 | 1 | ✅ | |
| 0 | 1 | 0 | ✅ | |
| 0 | 1 | 1 |
It is active low.