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refer to "TMS320x281x DSP Boot ROM Reference Guide" (Literature Number: SPRU095B)
i have another question:
What moment SCITXDA, MDXA, SPISTEA, SPICLK sould be set with response to XRST for proper choice of bootload mode? With no powering down VCC, VCORE and AVCC.
The question was set up because SCITXDA is an output so it can not be set to 1 or 0 before reset pulse occurs, but setting the SCITXDA pin after reset occurs do not guarantee that boot mode will be determined correctly.