Preface: We are need to program an MSP430F2274MRHATEP with 2-Wire JTAG style over a 3 ft cable. From the datasheet, we know that the cable is limited to 8 in (20 cm). However, we cannot program this close to the circuit for many reasons. Is there a way we can extend the programming cable to the MSP430 up to 3 ft with additional hardware or by slowing the programming speed?
Attempted Solutions: We are currently able to program over a 1 ft extension cable with no issues. When we simply add a 3 ft extension cable to it, it fails to upload. We have tried to change the TDIO capacitor value too. We changed the value all the way up to 2.2 nF, and even removed it with no luck. Another idea was to add a buffer in the TDO/TDI and the TCK signal wires. Unfortunately, we realize the TDO/TDI wire is bidirectional which our buffer cannot support.
Further Analysis: We have also analyzed the signals coming from the programmer and the TI FET. From what we can see, the signals coming right out of the FET, in the middle of our cable, and at the end of our short cable are all the same. Once we add our extension cable, we see the same signal, but this time it fails to upload.
Implementing Changes: If slowing the Spy Bi-Wire programming speed would extend the capabilities, how do I implement this change? If additional hardware would solve the extra length, what would need to be added
