SPRUJ53C April 2024 – February 2025 TMS320F28P550SG , TMS320F28P550SJ , TMS320F28P559SG-Q1 , TMS320F28P559SJ-Q1
The USB module has 2KB of message RAM embedded locally and exclusively accessible by the USB module when the USB clock is enabled.
In systems that do not use the USB, the CPU can use the RAM directly as long as the USB clock is not enabled. There is no other control bits needed for the CPU to access this RAM.