Bernard Mentink wrote: > Hi Janne, > > I presume by MSP-FET you mean the target board micro? (Confused, as my > understanding of an MSP-FET is a parallel port to JTAG adapter sold by > TI ???) > If you mean the former, then the pins you specify don't match up with > the page in the manual. > > The manual shows pin 8 of the JTAG header going to the TEST pin on the > device (which is pin 1 on the 2232) and pin 1 on the JTAG header no > longer goes to pin 38 on the 2232 (for JTAG mode) but > now goes to pin 7 (reset). I presume if the the JTAG pins are connected > they are not used in this mode and can be ignored. > > So my question is: Do I follow the manual circuit (Fig-3-1) or do I try > to connect as your instructions as they are different. Can you not > supply a schematic? A picture is worth a 1000 words! > > Thanks, > Bernie >
Hi Bernie, SBW doesn't work at all with parallel port JTAG. You must use USB FET for that. Here is a drawing of direct connection of SBW. My explanation was based on the assumption that you have 4-wire JTAG header on your 2232 target, like me. TEST/VPP connection is not necessary unless you want to blow the JTAG fuse which I assume is something you don't want to do right now. You are right, "normal" JTAG pins are not used with SBW. Here is the adapter schematic to convert from 4-pin JTAG to SBW: http://koti.mbnet.fi/jahonen/Electronics/Stuff/SBWAdapter.png As you can see, only two pins are used other than VCC and GND. To directly connect the 2232 to the USB FET (without JTAG fuse blow option): http://koti.mbnet.fi/jahonen/Electronics/Stuff/SBWConnection.png These two lead to same result, but using a SBW connected pinheader avoids the mess with adapters. Regards, Janne
