On Fri, Jun 10, 2011 at 7:17 PM, Michael Schwingen <rincew...@discworld.dascon.de> wrote: > If we agree that we do not want to touch the target, that means the > lowlevel interface driver must not change any signal state upon exit, > because it does not know what state that will put the target into.
If you disconnect the dongle then the target is definitely immune to changes on that dongle. > Changing signals to High-Z is *not* safe. It changes the JTAG signals to > a board-specific state that depends on the pullup/pulldown resistors on > the board. Depending on the old state of the JTAG pins, this may cause a > clock on TCK, with random values on the other pins. Michael, please read carefully, I think you don't understand what we say. There is more philosophy in your talk than it should be. The pull-up or pull-down resistors are used in the electronics to protect against random input states. If you switch output into Hi-Z the pull-up or pull-down resistor will take care of the on the pin state. Give us one good example where this is not true... Regards, Tomek -- CeDeROM, SQ7MHZ, http://www.tomek.cedro.info _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
