putting FT pins in Hi-Z state to use external programmer


shahabamo

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Hi,

 

I read the proposed workaround for putting FT2232 pins in High impedance to made JTAG pins accessible by an external programmer(+), But if we intend to design a new board, is it possible to put FT2232 in RESET or SUSPEND mode by modifying the design and adding a jumper to the board?

 

regards.

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Hi,

 

I read the proposed workaround for putting FT2232 pins in High impedance to made JTAG pins accessible by an external programmer(+), But if we intend to design a new board, is it possible to put FT2232 in RESET or SUSPEND mode by modifying the design and adding a jumper to the board?

 

regards.

 

Here's my opinion offered WITHOUT WARRANTY:

 

I think you can hold the FT2232H in reset by pulling pin 14 to ground.  You can do this by soldering a jumper wire on 10K resistor R28, which is next to FT2232H pin 14.

 

The FT2232H data sheet doesn't explicitly say what happens to the I/O pins when in reset.  However, FTDI does have an application note on the subject: http://www.ftdichip.com/Support/Documents/AppNotes/AN_184%20FTDI%20Device%20Input%20Output%20Pin%20States.pdf

 

According to AN_184, the programmable I/O pins are tri-stated but some have pull-ups.

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