Pieter Conradie wrote: > Hi Duane, > > Good catch! As always, RTFM :) > > I set the signal analyzer to catch the condition that you described ((rising > TCK) and (high RTCK)). See attached screenshot. This was with TCK set to 5 > kHz. As several people pointed out, TCK (jtag_khz) is too fast. > Yes, I know, I have done battery powered consumer electronics for *YEARS* and had to be very careful about what type of jtag box we used. That's why I wrote that FAQ.
FYI the new "ftdi2232H" is suppose to support RTCK. The Segger JLINK is suppose to support RTCK. Another good Jtag box is the Zylin10000 (http://www.zylin.com/zy1000.html). Previously [at old company] I used an expensive Majic jtag box from EPI TOOLS [now owned by Mentor Graphics]. Once you have a jtag dongle that supports RTCK, these problems will go away - because the dongle will auto-adapt. Meanwhile, you must use the poor mans hack :-( > P.S.S. I have a second hand Janatek / Jobmatch Systems Lu-La-Usb Logic > Analyzer (www.janatek.co.za). > I purchased one of these: http://www.usbee.com/sx.html, problem is it is a 3.3V only part :-( - beagle board is 1.8V grrr I'm making an adapter... The "SX" is actually just a simple Cypress FX2 chip - programed from the PC. The other nasty ness of this device is it uses the "cypress fx2 driver from cypress" - which I have personal experience with. The kindest words I can use are this: That cypress driver *F*ing *S*ks. The price was right.. -Duane. _______________________________________________ Openocd-development mailing list [email protected] https://lists.berlios.de/mailman/listinfo/openocd-development
