Interrupt Mask Register
| RHC | Region Hash Completed Interrupt Mask |
| RDM | Region Digest Mismatch Interrupt Mask |
| RBE | Region Bus Error Interrupt Mask |
| RWC | Region Wrap Condition Detected Interrupt Mask |
| REC | Region End bit Condition Detected Interrupt Mask |
| RSU | Region Status Updated Interrupt Mask |
| URAD | Undefined Register Access Detection Interrupt Mask |