JTAG Daisy Chain: Two DSPs and Igloo FPGA

Fares,

Fares Najjar said:

Hello,

I plan to connect two TI DSPs (PN TMS320F28335) and an Igloo FPGA (PN: AGL250V2-FG144I) in a daisy chain.  I also plan to use one 14-pin header to program the dsps using code composer studio, but I am unsure about programming the fpga on this chain.   Does anyone know:

1. How will code composer recognize the igloo fpga?

2. Will there be any undesirable interaction between the DSPs and FPGA?

Thanks,
Fares Najjar 

Code Composer Studio doesn't know anything about the Igloo FPGA and cannot program it.  CCS only works with TI devices like the TMS320F28335.  If you daisy-chain the JTAG chains, what you do to program the F28335s with CCS is specify the FPGA as a 'Bypass' in the CCS target configuration.  CCS will then put the FPGA into a bypass mode (all JTAG compliant devices must support the BYPASS command), and then CCS will ignore the FPGA from then on.

To program the FPGA, you would need to use whatever programming tool supports it.  This would come from the FPGA manufacturer, and not TI.  That tool would similarly have some mechanism where you would specify the F28335s as 'Bypass'.

Regards,

David