Thanks for that Chris. The reason I asked is that (I think) by using the BDSL "Bypass" instruction, a device effectively be frozen out of a system during boundary scan. The data passes from the TDI pin to the TDO pin, but does not access internal JTAG "functions.
So by daisy chaining the TDO/TDI pins on multiple devices, and paralleling TMS and TCK to all the devices, it would have been possible to configure a string of MSP's (The last device in the chain would be the first device requiring configuration.) I wonder if any engineers out there have made the mistake of connecting an MSP's JTAG pins up in a boundary scan chain, only to discover at a later date that the MSP does not comply with IEEE1149 Cheers Harry Home office phone (03) 9504 1957 hlemm...@optushome.com.au -----Original Message----- From: mspgcc-users-ad...@lists.sourceforge.net [mailto:mspgcc-users-ad...@lists.sourceforge.net]on Behalf Of Chris Liechti Sent: Thursday, January 29, 2004 5:52 AM To: mspgcc-users@lists.sourceforge.net Subject: Re: [Mspgcc-users] Programming multiple MSP430's on a board Harry Lemmens wrote: > Do TI have BDSL files for the MSP? > > I cannot find them on the TI website. Without these, you cannot access pins > around the device to perform boundary scan testing, since you have no idea about > what pins you may be accessing. (Perhaps they do not support boundary scan, > however, that is why JTAG came into existence (At least, I though this was why!) there is an other solution. with the JTAG, you can access the data and address bus. that way you can read/write the DIR, IN and OUT registers if the ports. that's of course not right away a "boundary scan", but its possible. > It only appears that TI describe some of the JTAG states that will allow access > to various parts of the device internals, useful for programming and > debugging.(see http://www-s.ti.com/sc/psheets/slaa149/slaa149.pdf) yep, our MSP430mspgcc library, found in the CVS is based on this code. chris ------------------------------------------------------- The SF.Net email is sponsored by EclipseCon 2004 Premiere Conference on Open Tools Development and Integration See the breadth of Eclipse activity. February 3-5 in Anaheim, CA. http://www.eclipsecon.org/osdn _______________________________________________ Mspgcc-users mailing list Mspgcc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mspgcc-users
