I've worked with DSP TMS320C6713. This model was embedded in a developer kit from Spectrum Digital.
Although your model is different, it belongs to the 6000 family.
If you want to build a customized kit, a good staring point would be the TMS320C6713 schematics. They can be found in this link:http://c6000.spectrumdigital.com/dsk6713/
I think Spectrum Digital doesn't have a development kit for the 6720.