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TMS320C40: Problem with TMS320C32 serial syncronous

Part Number: TMS320C40

In the company where I work, there is an old product that uses TMS320C32, and to send the firmware or boot is used the serial synchronous (DX0, CLKX0, FSX0, DR0, CLKR0, FSR0). But the program used doesn´t work and the fonts were lost.

Would someone know how works this port? Or Does someone have a software example communicating with this port?