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SIMtrace Hardware » History » Version 25

zecke2, 02/19/2016 10:49 PM

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[[PageOutline]]
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= Osmocom SIMtrace Hardware =
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This page is dedicated to the Hardware for Osmocom [wiki:SIMtrace], which looks like this:
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[[Image(simtrace_10_front.jpg, 33%)]]
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[[Image(simtrace_connectors_scaled.png, 39%, align=right)]]
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STATUS: We have received the second batch of 100 units from the SMT factory, ready for the 28C3 (Version v1.1p)
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== Connectors ==
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 * USB: USB mini-B connector. The main connector. The host software communicates (sniffing,...) through USB with the board. It can also be used to flash the micro-controller (using DFU).
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 * serial: 2.5 mm jack serial cable, as used by osmocomBB. port used to debug the device (printf goes there).
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 * debug (P3): same as serial, but using the FTDI serial cable. '''It is recommended to cut the voltage wire of the 6pin FTDI connector before plugging the cable into the simtrace.'''
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 * jtag (P1): JTAG 20 pin connector to do hardware assisted debugging.
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 * BT1: battery connector (4.5-6V DC). normally the USB provides power, but the battery port can be used for autonomous use of SIMtrace. The sniffing can be saved in the flash (U1).
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 * FFC_SIM (P3): to connect the flat flexible cable with SIM end for the phone.
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 * SIM (P4): put your SIM in there (instead of in the phone)
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 * reset (SW1): to reset the board (not erasing the firmware). If your are too lazy to unplug and re-plug the USB.
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 * bootloader (SW2): used to start the bootloader so to flash the device using DFU. press when plugging in the USB.
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 * test (JP1): short circuit using a jumper to flash using [wiki:SIMtrace/Firmware#EnteringtheSAM-BAmode SAM-BA].
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 * erase (JP2): short circuit using a jumper to erase completely erase the firmware.
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== Schematics, Gerber & Co ==
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The schematics, Gerber files, etc. can be found in the 'hardware' subdirectory of the simtrace.git repository:
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 * http://cgit.osmocom.org/cgit/simtrace/tree/hardware (web browsing
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 * git://git.osmocom.org/simtrace (git clone URL)
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We're using Kicad as EDA tool.  Most of the work on the schematics and Gerber files has been done by Kevin Redon,
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based on the original design by Harald Welte.
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The latest schematics are also available as an attachment to this page.
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== Interconnections ==
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The hardware schematics are very, very simple:
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 * Connect SIM-RST with PA7
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 * Connect SIM-I/O with PA6(TXD0) and PA1(TIOB0)
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 * Connect SIM-CLK with PA2(SCK0) and PA4(TCLK0)
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 * Connect SIM-GND with GND
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== Mode of operation ==
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The USART of the AT91SAM7S is capable of T=0. The documentation only mentions it in clock-master mode, like you
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would run it in a smart card reader to actively talk to a smart card. However, by using the USART input clock multiplexer,
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you can use an externally-generated CLK like the one from the SIM card socket of the phone.
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Unfortunately, the Rx Timeout feature of the USART is not working in T=0 mode, so I had to re-implement Rx timeout (waiting time)
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handling by means of the TC (timer/counter) block 0.  Due to technical limitations, we will wait up to one byte (12 etu) more
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than we should.
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== Modi ==
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SIMtrace has the possibility to work as:
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 * sniffer
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 * card reader
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 * card emulator
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 * man-in-the-middle
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The SAM7S offers 2 T=0 capable USART ports.
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One is connected to the phone (PA21-PA27), the other to the SIM (PA1-PA7).
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The lines goes from the phone to the SIM through a bus switch (IC4=[http://www.ti.com/lit/ds/symlink/sn74cb3q3244.pdf CB3Q3244]).
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The bus switch offer 2 buses of 4 lines:
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 * The first is used to forward RST, CLK, and VPP (between the SIM and the phone). It is controlled by SC_SW (PA20)
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 * The second is used to forward I/O (between the SIM and the phone). It is controlled by SC_I/O (PA19)
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The various modi require to interrupt different lines:
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|| SW_SC (PA20) || SC_I/O (PA19) || description || modus ||
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|| L || L || phone and SIM directly connected || sniffer (use any USART port) ||
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|| L || H || only I/O interrupted || MitM (use both USART port) ||
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|| H || H || phone and SIM not connected || card read, emulator (use each USART port) ||
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As of 2012-01-12, only the sniffer is implemented
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SIM cards support various classes (voltage levels): class A = 5.0V, class B = 3.0V, class C = 1.8V.
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SIMtrace v1.x only supports class B (3.0V), which all actual SIM cards and phone also support.
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To ensure class B is used, SIMtrace forces 3.3V (within the 3.0V±10% spec) by holding the VCC line at this voltage.
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SIMtrace v2 will support all 3 classes.
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== Revisions ==
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=== v2.0 ===
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This is on going work.
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The changes compared to v1.x are:
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 * ID-1 and ID-000 smart card slots (with presence detection): so to be able to also sniff credit card sized smart cards
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 * through hole USB Mini-B and Serial/Jack 2.5 connector: to be more robust
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 * properly support all smart card classes (A,B,C): better compatibility
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 * switch from AT91SAM7S to AT91SAM3S: it has more USB endpoints
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 * be able to forward voltage from phone to SIM or provide voltage from the board: ideal sniffer and reader
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 * use an microSD slot instead of built-on flash: easier data transfer
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 * a SWP sniffer (maybe)
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=== v1.1p (1.1 Production branch) ===
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This is a slightly corrected version of the v1.0p.
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Changes:
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 * a critical capacitor is near the LDO
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 * some other capacitors are nearer to the CPU
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 * some power traces are wider
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 * the SIM C6/VPP contact is also routed through the bus switch (sometimes used for Single Wire Protocol)
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 * sysmocom is added in the copper for legal reasons
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 * the FTDI Vcc is cut
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Downloads:
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 * [attachment:simtrace_v11p_schematic.pdf]
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 * [attachment:simtrace_v11p_gerber.zip]
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=== v1.0p (1.0 Production branch) ===
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[[Image(simtrace_v10p_front_mid.jpg, 33%)]]
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This is identical to v1.0 on the schematics side, we simply altered the footprints of some components to accommodate
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whatever the SMT factory had in stock.  Specifically the LED are 0805 instead of 0603, and the shottky diodes are
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in a slightly awkward looking very large package.
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Downloads:
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 * [attachment:simtrace_v10p_schematic.pdf]
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 * [attachment:simtrace_v10p_gerber.zip]
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=== v1.0 ===
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[[Image(simtrace_10_front.jpg, 33%)]]
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This is the first stable release.  We built some 5 prototypes from this version.
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Downloads:
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 * [attachment:simtrace_schem_v10.pdf]
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 * [attachment:simtrace_10_gerber.zip]
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=== v0.9 ===
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[[Image(simtrace_v09_top_mid.jpg, 33%)]]
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As of June 04, 2011 the components had all arrived and four PCBs were in production.  We assemble the first
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units around June 14, 2011.
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As of June 21st, we had four re-worked prototypes that are fully functional.
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=== v0.8 ===
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[[Image(simtrace_08_front_mid.jpg, 33%)]]
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Never really was an official release.  However, a friend took the unfinished Gerber files and built 5 units.
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Since the Gerber was not finished, we had to do lots and lots of re-work in order to make them work at all.
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== License ==
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Schematics and Gerber files are released under the Creative Commons CC-BY-SA (Share Alike / Attribution) license.
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== Sales ==
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Sales started at the 2011 CCC Camp and the hardware can be bought through the web-shop of sysmocom GmbH ([http://shop.sysmocom.de/])
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== Credits ==
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 * Harald Welte
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  * Original project idea, schematic design
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  * Olimex SAM7-P64 based prototypes
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  * Firmware and host software
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 * Kevin Redon
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  * KiCAD work on schematics, footprints and routing
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  * Soldering of some prototypes
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 * [http://sysmocom.de/ sysmocom - systems for mobile communications GmbH]
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  * funding for hardware prototyping (PCB, components, etc)
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 * Christian Daniel
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  * post-production flashing + debugging, design + test of v1.0p rework
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