7.6.3.4 Send Checksum

To write data to user zones that require authentication for write access (AM [1:0] = 00 or 10 in the access register), the host must first carry out the write command $B0. At this point, the memory is unchanged and the device is waiting for the host to provide a valid checksum before initiating the write cycle. The host sends the checksum it has computed using the System Write command with Address 1 = $02. Only if the checksum is valid will the device initiate the write cycle. Furthermore, if the device receives an incorrect checksum, it will clear the authentication privilege. After this command, the host must perform ACK polling.