Speeder

Using papilio loader with an external FT2232 chip

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Hi,

 

I am trying to use the Papilio loader to program an FPGA which has only JTAG pins. Do you have any ideas as to whether this would work if I have bought a FT2232 board? If I use the JTAG header on an existing papilio one and connect the jtag signals to another FPGA will that FPGA also be programmed with the same bitfiles which I am using to program the current FPGA?

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If you hold the FPGA in a reset state then you should be able to accomplish what you want. With the Papilio Pro there is a jumper to do this.

 

Jack.

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Well, with the Papilio One the reset pin is not connected to any headers so you would need a very steady hand with a soldering iron to connnect a piece of wire wrapping wire to it.

 

With the Pro and the DUO you can hold down the reset button, or with the pro, use the reset jumper.

 

Jack.

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Hi,

 

the Papilio programmer is AFAIK derived from xc3sprog. So if you have another FTDI chip, you can simply use that.

It will also (tested with the Pro) program the Papilio board from the command line.

 

Note that some FTDI breakout boards are missing the necessary pins for JTAG. The one I'm using most of the time is a "Signalyzer H4", which includes a larger 4-series chip with four independent virtual COM ports.

The Xilinx "USB" interface is cheaper, though, and works also with xc3sprog. I got mine from China via Ebay (the link points to a random vendor).

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