6.1.1 Password Verification

The use of passwords protects read and write access to the user zones. Any one of eight password sets is available for assignment to any user zone through configuration of the access registers. CryptoMemory® provides separate 24-bit passwords for read and write operations. Read passwords grant only read access to zones under password protection, while write passwords grant both read and write access. Successful presentation of any password renders the Verify Password command active until the presentation of another password or a device reset. Only one password may be active at a time. Presenting incorrect passwords decrements the value of the corresponding Password Attempts Counter (PAC). Decrementing the PAC to $00 permanently disables the corresponding password and permanently renders the corresponding user zone(s) under protection inaccessible. Operation in Authentication or Encryption modes requires encryption of passwords for all password transactions.