16 bit format:

| RegCAM | 15       | (14..8)  | 7   | (6..5) | (4..0)  |
| ------ | -        | -        | -   | ------ | ------- |
| 0      | isvec0   | regidx0  | i/f | vew0   | regkey0 |
| 1      | isvec1   | regidx1  | i/f | vew1   | regkey1 |
| 2      | isvec2   | regidx2  | i/f | vew2   | regkey2 |
| 3      | isvec3   | regidx3  | i/f | vew3   | regkey3 |

8 bit format:

| RegCAM | 7   | (6..5) | (4..0)  |
| ------ | -   | ------ | ------- |
| 0      | i/f | vew0   | regnum  |

Showing the mapping (relationship) between 8-bit and 16-bit format:

| RegCAM | 15      | (14..8)    | 7   | (6..5) | (4..0)  |
| ------ | -       | -          | -   | ------ | ------- |
| 0      | isvec=1 | regnum0<<2 | i/f | vew0   | regnum0 |
| 1      | isvec=1 | regnum1<<2 | i/f | vew1   | regnum1 |
| 2      | isvec=1 | regnum2<<2 | i/f | vew2   | regnum2 |
| 3      | isvec=1 | regnum3<<2 | i/f | vew3   | regnum3 |