Random read and sequential read operations are supported by the Security register provided
the device address uses a device type identifier of 1011b (Bh), and the A7
and A6 bits of the word address are set to 10b. Current address reads in
the Security register are not supported due to the fact that the required A7 and A6 address
bits in the word address byte do not get sent to the device.
The first 16 bytes of the Security register are by definition read-only and contain a preprogrammed ensured unique 128-bit serial number. The remaining 16 bytes of the Security register are user-programmable and can be locked from any future programming operations (see Lock Command).