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From: Christian J. <chr...@ja...> - 2008-02-18 21:05:21
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Michael Schwingen wrote: > Christian Jaeger wrote: >> The other thing I'm wondering about is the reset lines: the wiggler2 >> (I hope so) clone that I've built does feed the parallel port pin 6 >> (data4) through the voltage converter directly to JTRSTn of the ARM, >> and only the parallel port pin 2 (data0) is going through a >> transistor (open collector, pulled up with 50k) to nSRST; so the >> latter is being inverted, while the former is not. Now I've seen in >> the diploma thesis from Dominic, in Figure 1.1, that he is actually >> inverting *both* nTRST and nSRST. Should I do like him or did that >> change? >> > There were some problems with the schematic - IIRC, the schematic in > the thesis is for the "oldwiggler" cable. > > A schematic that matches the wiggler/wiggler2 definitions is here: > > http://www.ccac.rwth-aachen.de/~michaels/index.php/hardware/armjtag Ok, that's precisely what I've built, except that I've used a SN74LVC244A as level-shifter, and I didn't get what he wanted to do with the multi-LED's, I simply attached 2 single LED's instead, and I did without a (voltage-limiting) Z-diode. So I should be fine. Thanks, Christian. |