1 # A start sequence to change from cJTAG to 4-pin JTAG
2 # This is needed for CC2538 and CC26xx to be able to communicate through JTAG
3 # Read section 6.3 in http://www.ti.com/lit/pdf/swru319 for more information.
4 proc ti_cjtag_to_4pin_jtag {jrc} {
6 irscan $jrc 0x3f -endstate RUN/IDLE
7 # Two zero bit scans and a one bit drshift
8 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
9 pathmove DRPAUSE DREXIT2 DRUPDATE RUN/IDLE
10 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
11 pathmove DRPAUSE DREXIT2 DRUPDATE RUN/IDLE
12 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
13 pathmove DRPAUSE DREXIT2 DRSHIFT DREXIT1 DRUPDATE RUN/IDLE
14 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
16 # A two bit drhift and a 9 bit drshift
17 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRUPDATE RUN/IDLE
18 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
19 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
20 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
21 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
22 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
23 pathmove DRPAUSE DREXIT2 DRSHIFT DREXIT1 DRPAUSE
24 pathmove DRPAUSE DREXIT2 DRUPDATE RUN/IDLE
25 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
28 irscan $jrc 0x3f -endstate RUN/IDLE
30 # Set ICEPick IDCODE in data register
31 irscan $jrc 0x04 -endstate RUN/IDLE