6.3.8.5 CS0 – CS3: Programmable Chip Select (Only Relevant in Synchronous Protocol)

The four most significant bits (b4 – b7) of every command comprise the Chip Select address. All CryptoMemory® devices will respond to the default Chip Select address of $B (1011). Each device also responds to a second Chip Select address programmed into CS0 - CS3 of the device configuration register. By programming each device with a unique Chip Select address, it is possible to connect up to 15 devices on the same serial data bus and communicate with each individually. Global communication to all devices sharing the bus is accomplished using the default Chip Select address $B.