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why the 6670 on my board can not output anything through the GPIOs and can not connect to the Peripheral devices?

hello all,

        As the topic. The 6670 on my board can not output anything through the GPIOs and can not connect to the Peripheral devices.

But the JTAG is  connect correctly. We can find the chip in the software CCS5.1.031. And the clock test point (Sysclkout) output the right clock.

and we can also write values into the internal register.

        we use a FPGA chip to control some pins of the dsp. But I do not know how to determine the causes of this situation.How can I solve it?

Waiting for  your replying.Thank you very much.