-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
Hi Kevin.
here the schema. all the components are on it, but I don't know if the electrical part is right. Any comments/advices are welcome.
schema : https://gsm.tsaitgaist.info/SIMtrace/v0.6/SIMtrace.ps source (KiCAD) : https://gsm.tsaitgaist.info/SIMtrace/v0.6/
I took a look at your shema, here are my thoughts:
The SC_SW line controls all analog switch pins. I think you should be a bit more selective here. To create a situation like this for example:
VCC, RST, CLK are connected through and I/O is connected to the man in the middle who can manipulate the traffic in realtime.
I have looked at the QS3245 datasheet. It has only one OE input pin ;-/
With your current design you will have do generate the smartcard clock yourself, you could use the clock from the target (with care!) when you can switch at least I/O seperatly.
You can leave the VPP away, it is deprecated. (save PCB-Space ;-)
Maybe you can leave Jtag away (save even more PCB-Space ;-) the AT91SAM7 series have fancy bootloaders - but maybe you will need the JTAG for debugging so it is your decision.
You should give the BATT-PWR/USB-PWR construct a short test. Maybe it is problematic when one power source drives into another that is switched off.
regards. Philipp
- -- ______________________________________ Philipp Fabian Benedikt Maier
philipp.maier@runningserver.com Funk: DO5DXT http://www.runningserver.com http://www.diskettenschlitz.de ______________________________________