SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
VBUSM.C interfaces use credits for sending data phases. For writes and read responses to the MSMC (VBUSM.C consumer), there is a requirement that all credits for the write, including the command and all data phases, should be available before sending the command. Since the VBUSM.C data width is always half the max burst size on VBUSM.C, the write command must wait for a TAC credit available and 1 or 2 TDC credits available before the write can be sent.