TMS320C6455 DSP JTAG Chain

Amith Bhat

Intellectual 275 points

Other Parts Discussed in Thread: TMS320C6455

Hi,

We are using two no. of TMS320C6455 DSPs in our board.

We have provided one 14-pin JTAG connector for DSP JTAG connectivity and 2 DSP are daisy chained.

I have attached the connection diagram of the DSP JTAG chain in our board.

We have read various document from TI on the JTAG connectivity of the DSP. But not very clear on how to daisy chain multiple DSPs

Below are my queries.

I have buffered TCK,TDI,TMS and TDO signals. whether any of other signals need to be buffered?
Should EMU0 and EMU1 signals to be routed in daisy chain or T routing?

Please provide your feedback.

Regards,

Amit K Bhat.

over 10 years ago

0 Senthilkumar Srinivasan over 10 years ago

TI__Mastermind 43660 points

Hello Amith,

The JTAG connection on multiple devices is clearly explained in the below wiki link. This also includes what are all the signals need to be buffered.

http://processors.wiki.ti.com/index.php/XDS_Target_Connection_Guide#Multiple_Devices

Regards,

Senthil

0 Amith Bhat over 10 years ago in reply to Senthilkumar Srinivasan

Intellectual 275 points

Hello Senthil,

Thank you for your reference document.

I have one query,

We have routed EMU0/1 is daisy chain manner. I have done the SI for these two signals.

Signal quality is good with DSP1 output at JTAG connector.

But signal has ringing with DSP2 output at JTAG connector.

Can you please suggest, whether we need to implement daisy chain topology or tree topology for EMU0/1 signals?

Thanks in advance.

Regards,

Amit

0 Senthilkumar Srinivasan over 10 years ago in reply to Amith Bhat

TI__Mastermind 43660 points

Hello Amit,

It is recommended to follow the topology as shown in figure 3 in the above wiki page. Please ensure these lines are pulled up to DVdd.

Regards,
Senthil

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TMS320C6455 DSP JTAG Chain