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.