MB0=0, MB3=0, MB20=0, MB18=0, MB28=0, MB29=0, MB22=0, MB21=0, MB2=0, MB9=0, MB30=0, MB19=0, MB4=0, MB27=0, MB15=0, MB7=0, MB5=0, MB23=0, MB24=0, MB25=0, MB12=0, MB26=0, MB6=0, MB31=0, MB14=0, MB10=0, MB8=0, MB11=0, MB1=0, MB17=0, MB13=0, MB16=0
Mask Invalid Register
| MB0 | mailbox 0 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB1 | mailbox 1 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB2 | mailbox 2 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB3 | mailbox 3 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB4 | mailbox 4 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB5 | mailbox 5 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB6 | mailbox 6 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB7 | mailbox 7 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB8 | mailbox 8 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB9 | mailbox 9 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB10 | mailbox 10 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB11 | mailbox 11 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB12 | mailbox 12 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB13 | mailbox 13 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB14 | mailbox 14 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB15 | mailbox 15 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB16 | mailbox 16 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB17 | mailbox 17 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB18 | mailbox 18 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB19 | mailbox 19 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB20 | mailbox 20 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB21 | mailbox 21 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB22 | mailbox 22 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB23 | mailbox 23 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB24 | mailbox 24 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB25 | mailbox 25 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB26 | mailbox 26 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB27 | mailbox 27 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB28 | mailbox 28 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB29 | mailbox 29 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB30 | mailbox 30 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |
| MB31 | mailbox 31 Mask Invalid 0 (0): Mask valid 1 (1): Mask invalid |