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JTAG and unpowered Sharc

Question asked by NiCo_74 on Jan 16, 2014
Latest reply on Jan 24, 2014 by NiCo_74

Hi,

 

I am designing a board with 8 sharc DSP (ADSP-21467). I can switch off supplies of each DSP individually for power saving.

My question is about JTAG chain on unpowered DSP. I would like to know if I can drive JTAG signals on unpowered DSP pins without affecting the JTAG chain or the DSP.

Of course, I plan to uses switches to short TDI and TDO on unpowered DSP to bypass the DSP.

 

I ask this question because if I don't need to use buffers to disconnect JTAG on unpowered DSP I would save many devices on my board.

 

Thanks for the advice.

 

NiCo.

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