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tiacx1xx [2010/08/10 00:12]
steve_m device table, links
tiacx1xx [2010/08/10 01:38]
steve_m create opencd section
Line 11: Line 11:
 For a full list of devices see [[http://​​matrix.html|here]]. For a full list of devices see [[http://​​matrix.html|here]].
 +====== ACX100 JTAG Port ======
 +When taking apart a Level1 WBR-2401B router, I noticed that the used ACX100 CardBus-card has a 6-pin header.
 +{{:​acx100_jtag.jpg?​800|ACX100 card with JTAG header}}
 +As it turned out by try and error, it is connected to the JTAG pins of the ACX100 chip. Once it was clear that the first 2 pins are GND and VDD (+3.3V), I tried all combinations of the JTAG signals.
 +^ Pin   ^ 1   ^ 2   ^ 3   ^ 4   ^ 5   ^ 6   ^
 +|signal | GND | VDD | TCK | TDI | TDO | TMS |
 +==== OpenOCD ====
 +I used [[http://​​web/​|OpenOCD]] to connect to the [[http://​​help/​index.jsp?​topic=/​com.arm.doc.ddi0210c/​Chdeaegh.html|EmbeddedICE]] unit of the ARM7TDMI core.
 +Since the ACX1xx contains a pretty standard TI TMS470 ARM7 core, it uses the TMS470 IDCODE:
 +Info : clock speed 6000 kHz
 +Info : JTAG tap: acx1xx.cpu tap/device found: 0x3100e02f (mfg: 0x017, part: 0x100e, ver: 0x3)
 +Info : Embedded ICE version 1
 +Info : acx1xx.cpu: hardware has 2 breakpoint/​watchpoint units
 +This is the used configuration file for OpenOCD (using the [[http://​​wiki/​Debug_Board_v3|OpenMoko Debug Board]]) as JTAG interface:
 +<file - acx1xx.cfg>​
 +interface ft2232
 +ft2232_device_desc "Debug Board for Neo1973 A"
 +ft2232_layout "​jtagkey"​
 +ft2232_vid_pid 0x1457 0x5118
 +reset_config trst_and_srst
 +jtag_khz 6000
 +jtag newtap acx1xx cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id 0x3100e02f
 +target create acx1xx.cpu arm7tdmi -chain-position acx1xx.cpu -endian little -variant arm7tdmi
tiacx1xx.txt ยท Last modified: 2011/01/09 03:21 (external edit)