Le 22.01.2013 16:32, Laurent Gauch a écrit : >> 2. RnW signal is driven by one mpsse port read/write command. Transfer >> is done by another command that use MOSI MISO lines. These two >> commands are separate. How do you want to make something more >> efficient with that? If you have better idea on how to integrate >> Transfer with PortHi and PortLo mask change theny say it maybe we can >> increase efficiency of ft2232 interface :-) >> >> > The RnW signal is depending on the layout , right ? > > The next JTAGkey will not need to play with GPIO access to remote SWD > protocol over the mpsse protocol. The RnW signal will be JTAGnSWD at the > init of the layout, then only synchro shift command will be used from > the mpsse, without any GPIO bitbang access, to remote the SWD. > This will make the SWD support more efficient ( better payload, less > command for the same job), fully synchro ..., and respecting the > frequency asked. > > Note: The GPIO access on mpsse does not have the control of the timing > on the IO, which will make for sure some timing issue, when you will > play with the frequency of the SWD CLK. > But using only shift command will make the SWD stable from 100Hz to 30MHz. That 's explain my previous comments about pur bitbanging a GPIO ... you do not have control of timing on that IOs , except you have a access to a kind of timer (delay) -> not present in the mpsse core :-). > Anyway, you work is a good starting point. I could try to ship you a > JTAGkey next generation to do some tests. > > Laurent > http://www.amontec.com > > > ------------------------------------------------------------------------------ > Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, > MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current > with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft > MVPs and experts. ON SALE this month only -- learn more at: > http://p.sf.net/sfu/learnnow-d2d > _______________________________________________ > OpenOCD-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/openocd-devel
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