On Fri, Jun 10, 2011 at 2:18 AM, Tomek CEDRO <tomek.ce...@gmail.com> wrote:
> On Thu, Jun 9, 2011 at 11:46 PM, Andreas Fritiofson > <andreas.fritiof...@gmail.com> wrote: > > Setting the FTDI pins to Hi-Z is not necessarily the same as setting the > > pins in the JTAG connector to Hi-Z. There is arbitrary dongle-specific > > interface logic between the FTDI chip and the connector. > > Not true. Good example here can be KT-LINK SWD+JTAG buffers [1] > configuration designed by Krzyszfot Kajstura - all signals can be > electrically disconnected from target and they are in default > configuration (after powerup). This is really nice design, also the > first open SWD+JTAG for FT2232H chip. Interface can also offer > additional signals such as various resets and control that also should > be disconnected, especially for other transports. Upcoming SWD > framework make use of existing ft2232 code, also the ft2232_quit() > function, so there is a default possible behavior common to all > ft*232-based devices. Thats not that complicated, isn't it? > What are you talking about? Not all ftdi dongles are wired like this => there is no universal default setting suitable for all dongles. /Andreas
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