> 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. 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
