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Philipp Fabian Benedikt Maier philipp.maier at runningserver.com-----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 at runningserver.com Funk: DO5DXT http://www.runningserver.com http://www.diskettenschlitz.de ______________________________________ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJNxbr1AAoJECnygI88j3oSzkkIAIvD77CZfOKHcnwmsZf5lWOH yBfRdjVkEMNmx0y4NIzDRd/XyiPgbSKGfRAvuxqZ9CXYT5xrD+vli6i0r8HeY+Lf YcS/onQmFjsE8X7s9+6mcgek8RembqO3nbxh2vo05bilLQ4zAdNDfIwiKhL2JF5o rxiD3+xjgywWb46uyspHpjOm8hAQJkP7TxRtMJ60OqbzTx2B7nyIf/Z+u5idaJqH IiYmttmEng3kJ1DP0Larlvobw9bG6WY8CTXvae2K1Y87qWzeuKkIAN0/2Dqig7lV dNG3n4vHlnHZfS6iIxHfaL4cJ+TjH18yn+T48j7SXptlMfklTloEHvlb0t7tqeY= =ARUX -----END PGP SIGNATURE-----