21.5.94.1 Region Size
| Bit 0 | Bit 1 | Bit 2 | Bit 3 | Bit 4 | Size |
|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | Reserved |
| 0 | 0 | 0 | 0 | 1 | Reserved |
| 0 | 0 | 0 | 1 | 0 | Reserved |
| 0 | 0 | 0 | 1 | 1 | Reserved |
| 0 | 0 | 1 | 0 | 0 | Reserved |
| 0 | 0 | 1 | 0 | 1 | Reserved |
| 0 | 0 | 1 | 1 | 0 | 128 Bytes |
| 0 | 0 | 1 | 1 | 1 | Reserved |
| 0 | 1 | 0 | 0 | 0 | Reserved |
| 0 | 1 | 0 | 0 | 1 | Reserved |
| 0 | 1 | 0 | 1 | 0 | 2 KB |
| 0 | 1 | 0 | 1 | 1 | Reserved |
| 0 | 1 | 1 | 0 | 0 | Reserved |
| 0 | 1 | 1 | 0 | 1 | 16 KB |
| 0 | 1 | 1 | 1 | 0 | 32 KB |
| 0 | 1 | 1 | 1 | 1 | 64 KB |
| 1 | 0 | 0 | 0 | 0 | 128 KB |
| 1 | 0 | 0 | 0 | 1 | 256 KB |
| 1 | 0 | 0 | 1 | 0 | 512 KB |
| 1 | 0 | 0 | 1 | 1 | Reserved |
| 1 | 0 | 1 | 0 | 0 | Reserved |
| 1 | 0 | 1 | 0 | 1 | Reserved |
| 1 | 0 | 1 | 1 | 0 | 8 MB |
| 1 | 0 | 1 | 1 | 1 | Reserved |
| 1 | 1 | 0 | 0 | 0 | Reserved |