David Brownell wrote: > On Tuesday 23 June 2009, Magnus Lundin wrote: > >> The protocol to talk to MPSSE is well known/open (they do praise >> developers of open alternatives on thier web site) , >> > > Though for the record ... the "bitbang" protocol > for FT232 (not FT2232) is neither well-known nor open. > > If that were open, it would be possible to implement > JTAG on other FTDI chips. Less efficiently, to be > sure, but with easier 1.8V compatibility. > > - Dave > I call BS.
Do you know JTAG over FT232 ? Somer folks called you USB expert. The protocols available for FT232 are well published, it is not hard but unpleasant to implement JTAG on them, that is what interfaces like the Altera USB Blaster does. But JTAG over MPSSE is soo much nicer that nobody who has worked with this wants to go back to FT232 (without the extra 2), it is not a tecnical problem it is just a PITA. /M _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
