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