I have an LM3S102 and am looking to hook up my ARM-USB-TINY to it (2x10 standard JTAG connector). I am not sure what needs to be done in terms of pull up resistors, and inline current limiting resistors.
I have been looking at the reference designs, but they seem a little overly-complex with tri-state buffers and discrete logic components. It looks like they built in their own JTAG system. So I am wondering what the correct way to hook it up is?
Right now I have:
VREF + VTARGET ↔ 3.3V (tied directly to source)
GND ↔ GND
PB7/TRST# ↔ NTRST
PC0/TCK/SWCLK ↔ TCK
PC1/TMS/SWDIO ↔ TMS
PC2/TDI <–>TDI
PC3/TDO/SWO <–>TDO
RTCK, RST, DBGRQ, and DBGACK are floating.
In the reference designs they did not hook up TRST# to NTRST… I am not sure why. Also (I assume) I should hoot up the RST line on the micro to the RST line on the JTAG?
Should I be pulling anything high, putting resistors in series, do anything with the unused floating lines?
This JTAG stuff is a bit new and there are lots of schematics out there where things are done differently.
I have an LM3S102 and am looking to hook up my ARM-USB-TINY to it (2x10 standard JTAG connector). I am not sure what needs to be done in terms of pull up resistors, and inline current limiting resistors.
I have been looking at the reference designs, but they seem a little overly-complex with tri-state buffers and discrete logic components. It looks like they built in their own JTAG system. So I am wondering what the correct way to hook it up is?
Right now I have:
VREF + VTARGET ↔ 3.3V (tied directly to source)
GND ↔ GND
PB7/TRST# ↔ NTRST
PC0/TCK/SWCLK ↔ TCK
PC1/TMS/SWDIO ↔ TMS
PC2/TDI <–>TDI
PC3/TDO/SWO <–>TDO
RTCK, RST, DBGRQ, and DBGACK are floating.
In the reference designs they did not hook up TRST# to NTRST… I am not sure why. Also (I assume) I should hoot up the RST line on the micro to the RST line on the JTAG?
Should I be pulling anything high, putting resistors in series, do anything with the unused floating lines?
This JTAG stuff is a bit new and there are lots of schematics out there where things are done differently.
Thanks,
Sam
I just wired up an LM3S815, I cribbed from the Stellaris DB48 daughtercard schematic, four 10K pullups total: TRST, TCK, TMS, TDI, no pullup on TDO or SRST_B, and RTCK left unconnected.