EJTAG
From t-hack.com - Hack X300T / X301T
(eJTAG infos) |
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Since the SMP863x CPU has a MIPS core, it also has a JTAG port :) But it is deactivated by default :( | Since the SMP863x CPU has a MIPS core, it also has a JTAG port :) But it is deactivated by default :( | ||
| − | In case of the X300T there is a eJTAG connector and also a jumper to activate the eJTAG, as shown in the image below. The jumper can be permanently shorted. | + | In case of the X300T there is a eJTAG connector and also a jumper to activate the eJTAG, as shown in the image below. The jumper can be permanently shorted. For DIT9719 PCB follow [[DIT9719 PCB]]. |
Only the pins TDI, TDO, TMS, TCK and GND are needed to make the interface work. | Only the pins TDI, TDO, TMS, TCK and GND are needed to make the interface work. | ||
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eJTAG Pinout of the X300T | eJTAG Pinout of the X300T | ||
[[image:Pinout.jpg|300px|eJTAG Pinout of the X300T]] | [[image:Pinout.jpg|300px|eJTAG Pinout of the X300T]] | ||
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== How to get an Interface == | == How to get an Interface == | ||
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== DLC5 JTAG == | == DLC5 JTAG == | ||
| − | [[image:JTAGunbuffered.png]] | + | [[image:JTAGunbuffered.png]] [[image:DLC5-Sample.JPG|right|thumb|300px|my cable]] |
| − | + | or | |
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| − | + | [[Image:Wrt jtag-kabel schaltung.gif]] | |
| − | + | ||
| + | ;Advantage | ||
| + | * easy to build | ||
| + | * very cheap | ||
| + | * no power supply needed | ||
| + | |||
| + | ;Disadvantage | ||
| + | * interface cable has to be rather short to avoid transmission errors. 10-20cm is probably the maximum length. shorter == better | ||
== Wiggler Clone JTAG == | == Wiggler Clone JTAG == | ||
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[[image:Wiggler.png]] | [[image:Wiggler.png]] | ||
| − | Advantage | + | ;Advantage |
| − | + | * interface cable can be a bit longer .. probably 30-50cm, but also in this case, shorter == better | |
| − | + | * Macraigor software can be used | |
| − | + | * the target systems CPU is protected by the buffer | |
| + | |||
| + | ;Disadvantage | ||
| + | * more complicated to build | ||
| + | * more expensive but still cheap | ||
| − | + | [[category:Hardware]][[category:EN]] | |
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