SPRUID8D September 2020 – January 2022 TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1
As a fault avoidance safety measure for key registers of FSI module, registers are protected by EALLOW privilege, register keys, and a master register lock. These protections ensure that no spurious writes or unintentional modifications to these registers are avoided. Some bits in the FSI registers are protected by a key. In order to write to these bits, the key must be written at the same time.
The control register lock will prevent any writes to the control registers until the lock is released. To set the control register lock, write 0xA501 to RX_LOCK_CTRL and TX_LOCK_CTRL for the receiver and transmitter, respectively.