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That is correct, but you should be powering the 93LC46B at 5V, not 3.3V. Look at your schematic, both VCC and the pullup are currently to 3.3V.
Cheers,
Dave
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sorry i completely see your point now :)
thanks :)
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Why not use MPSSE mode for JTAG programming directly?
You could wire the FTDI to the JTAG chain and then program either the FPGA or the EPCS device.
You could add a multiplexer, or tri-state the FTDI pins, and still be able to use the external JTAG connector.
Cheers,
Dave
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dont really want to go down the multiplier / tri state route as i want to keep this design cheap and as simple as it can be
the JTAG header doesn't really need to be there at all. its just for the first prototype pcb really just for backup - when in production i wont even solder a header onto it!
i have heard of this MPSSE mode and i know the FTDI can do it. but i did a bit of research on it and could not find much info on software that does the actual programming side of it. so decided to go with the other method instead which i KNOW works as i have tested it on a demo rig i have built using this FPGA and the FTDI chip :) it comes with a really nice c library i can wrap up in a nice little firmware upgrade tool i can give to people who want to update the firmware on this device in the future :)
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