Each XPPU also uses the Master ID in each AXI transaction to validate the transaction. The Master ID is masked by the [MIDM] bit field and then compared against the [MID] bit field in the MASTER_IDxx registers. If This Equation is satisfied (along with [TRUSTZONE] and [PERMISSION] checks in the APERPERM_xxx register), then the transaction is allowed. In This Equation, these are [10-bit parameters] in the MASTER_IDxx register:
