Pavel Chromy:

- lower jtag speeds (higher divisor) was used, TDI was not changed on falling TCK edge as it should
- reset signal was release upon any TMS transition, making it impossible to use reset halt
- added khz() and speed_div() functions

git-svn-id: svn://svn.berlios.de/openocd/trunk@716 b42882b7-edfa-0310-969c-e2dbd0fdcd60