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--- projects:routers:netgear:wgt634u [2013/01/20 01:03] – [JTAG software] admin
+++ projects:routers:netgear:wgt634u [2013/02/01 11:35] (current) – [JTAG software] admin
@@ Line 37: / Line 37: @@
 R73 (pin 11) 33Ω
 </code>
+Information about the pinout on the wgt634u can be found [[http://wiki.openwrt.org/doc/hardware/port.jtag|here]]. It is assumed that the pin layout is MIPS EJTAG 2.6 compatible:
+<csv hdr_rows=1>
+function,pin,pin,function
+nTRST,1,2,GND
+TDI,3,4,GND
+TDO,5,6,GND
+TMS,7,8,GND
+TCK,9,10,GND
+nSRST,11,12,n/a
+n/a,13,14,Vcc
+</csv>
+A buffered cable such as the Wiggler requires an external Vcc voltage supply. The 14-pin header conveniently supplies this voltage on pin 14. The typical unbuffered cable, however, does not require an external voltage in order to function. Formally, the pin 14 is called VREF and used to indicate a JTAG signal levels: 5V, 3.3V or 2.5V. On the most devices this pin is tied to the device's Vcc and may be used to power a buffer IC chip (and to generate an appropriate levels as result). Note that the 12-pin JTAG header arrangement does not provide Vcc.
 ==== JTAG software ====
 In the openmoko wiki they tell how to use openocd with the Debug Board to flash the openmoko Freerunner gsm phone; but there's no information regarding MIPS devices like the WGT. I finally managed to do it using urjtag revision 1855 (current HEAD) from their svn.
@@ Line 64: / Line 76: @@
 flashmem 0x1fc00000 wgt634uCFE.bin
 </code>
+===== Links and information =====
+  * [[http://www.fccps.cz/download/adv/frr/spi/msi_spi.html]] Programming a flash chip in-circuit via the parallel port

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