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Home / MISC Areas / Mattel JuiceBox jtag on the cheap jtag for cheap

jtag on the cheap (modified 0 times) werejag Profile http://warmcat.com/milksop/cheaptag.html just found this and thought it mnight come in useful 04-22-2005 03:39:38

RE:jtag on the cheap (modified 0 times) werejag Profile does anyone have info on which points is the jtag interface? 04-23-2005 02:36:28

RE:jtag on the cheap (modified 0 times) RalphWonderLlama Profile Ah, finally joined. BEWARE OF YOUR VOLTAGE DIFFERENCES ON THE JTAG! The one you link to might cause problems due to the voltage differences. I forgot if the JuiceBox is 3.3V or lower, so I will warn that even with a resistor between the 5 and 3.3, a logic high or low is still dodgey for the 3.3 inputs. It would be best to run the JTAG through a voltage level shifter buffer. You can get those cheap. Postage is probably more than what the chip would run. While you are at it, pop it onto a small board and get some decent ends. 04-23-2005 11:35:12

RE:jtag on the cheap (modified 0 times) RalphWonderLlama Profile Doah! I forgot the link to the JTAG connections! Anyway, in the first thread here that got way too long, they had a better JTAG reference http://www.lart.tudelft.nl/projects/jtag/jtag-lart_schematic.pdf prpplague posted them at http://www.elinux.org/wiki/JuiceBox?highlight=%28CategoryJuiceBox%29 I can't tell which holes are which, but it should be easy to figure out by tracing the lines. 04-23-2005 12:03:03

RE:jtag on the cheap (modified 0 times) werejag Profile well so far no one has figured out what pins are what i saw the wiki picture and it was no more help last month than it is now. 04-23-2005 13:49:52

RE:jtag on the cheap (modified 0 times) greghol Profile [quote]well so far no one has figured out what pins are what i saw the wiki picture and it was no more help last month than it is now. [\quote] I hae jtag connected and it works fine. I can take pictures of the area and put it on the wiki I guess. They are all comming out on vias near the upper left hand corner of the CPU when looking at the component side (buttons on the left) I used the pinout from the 44b0x datasheet to find the vias. Scrapped the solder mask off of the vias and soldered wire wrap to the vias. 04-25-2005 00:46:42

RE:jtag on the cheap (modified 0 times) werejag Profile could you please. 04-25-2005 01:40:17

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