12-12-2018 01:27 AM
Does anyone know if it is possible to use CoolRunner-II USERCODE register that is normally available on JTAG also for impact on internal logic?
12-12-2018 02:10 AM
No, you cannot access the usercode in the CPLD logic. It is accessible only through JTAG
12-12-2018 02:25 AM
12-12-2018 03:22 AM
coolrunner cpld's are small devices/low cost devices compared to FPGA's and do not have the features like bscan & user_access primitive which are available in fpga's.
what is the reason for looking this feature?
12-12-2018 04:50 AM
We are looking for mechanism that enables us to configure CPLD in two modes of operation. With no configuration change (reprogramming) and available very fast after startup, that is why it can not be EEPROM eg. The idea was to program only USERCODE via JTAG and decode it internally.