Target interface analysis

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Voltage level shifter:

I am still trying to decide the best way to go for adjusting to the target platform voltage.  SPI typically needs 3 bits output (SS, SCLK, MOSI) and one bit input(MISO)  Sometimes SPI needs more. JTAG needs 4 pins output(TCK, TMS, TDO, TRST) and one bit input(TDI). I found the JTAG signal description on this page. I2C needs two bits of bi-directional open drain signals.  I don’t know of any MicroControllers that can be programmed over I2C but there are flash memories that are programmed that way.

Based on this information, I can see that I would want 4 bits of output and 2 input along with a 2 bit open drain bi-directional.  This gives me a total of eight bits of data available to connect to the target device.  In addition to that, I need Target Vcc and GND and Vpp. Continue reading