Category: Configuration/Programming
tool:-
device:-

There is no memory area for user design version control inside the device, but it can be realized by using "USERCODE" as a possibility. It is 32-bit and can hold arbitrary user data, but in the MachXO2/3 series it is contained in non-volatile memory. Access to the USERCODE value is provided as one of the programming commands, so it can be read/written from the programmer (JTAG) or external CPU.
If USERCODE is not sufficient, such as when a user-specific interface needs to be accessed, the user will be required to implement it. A commonly used method is to prepare a general-purpose register area using FF or RAM/ROM as the user logic in the FPGA, and assign a version number area to this area. A series of registers (maps) and external access methods are designed and implemented by the user.