Well that makes it easy, you can get to the traces, I was worried they would be buried in an inner layer or something. I would do it mechanically, get a small 3pole double throw relay. Glue it onto the board near the traces. Cut the traces with a sharp knife (I use a sharp pocket knife for this type of surgery). Using thin wires (I personally use wire wrap wire since I have a lot of that stuff laying around, but other thin flexible wire will do) connect the trace going the the DAC chip to the center contact of the relay. The trace going to the Xilinx chip goes to the contact that is connected to the center contact when the relay is NOT powered. The other contact goes to the debounce board. Do this for all three traces.
You then need another switch that turns the relay on or off. Relays usually com ein either 12V or 5V types, use whatever voltage is handy. So this means you have a control board with four switches, one for the relay and one each for the three signals. That should be all you need to do. You could hook the control board up through a multi-pin connector. When its disconnected the Transporter behaves normally. When you want to put it in slow rolloff mode, make sure all the signal switches are high and the relay if off. Turn on the relay, set CSN to low, set CDTI to the bit you want, toggle CCLK low then high, change CDTI, toggle CCLK... When done with all 16 bits bring CSN high, turn off the relay and you are done. John S. -- JohnSwenson ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=76763 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
