build your very own buffered jtag [Archive]

View Full Version : build your very own buffered jtag

11-27-2003, 04:13 AM

Chapster99

11-27-2003, 04:25 AM

Hey chupy, did you forget to attach the file?

Ok...there it is. Very nice work, chupy! I will try this out on my next day off. A big thanks once again, dude! Did you also upload it to the files section?

11-27-2003, 04:26 AM

Chapster99

11-27-2003, 04:34 AM

Yeah, it has been for a few days now. Waiting for the new server to be installed...

Chapster99

11-27-2003, 02:03 PM

no I am just new here and the site allso keeps hickuping...LOL

You may be new here at this site, but you're concidered a veteran in this hobby. Those that have been testing for awhile should know that!

11-27-2003, 10:18 PM

Chapster99

11-28-2003, 02:03 PM

You're always welcome here, dude! In my books, you are an extremely big asset to any site that you help out at. I just thought you were only loyal exclusively to M.tv ...lol!

humpper

12-02-2003, 04:08 AM

Good to see you Chupy !!.....I thought I saw an orange sheep here the other day !!

12-02-2003, 04:20 AM

fubr

01-25-2004, 01:46 AM

Finally got the ic(74hct244) and it worked like a champ on a 301.10.
read flashes, was 00001 and it took update. then for shits and giggles I erased both flashes and wrote back with softlock. IRD updated and is still up.

What the hell is the switch for?(3V and 5V). I left it in the center position to read and write.
looked back thru november and cant find a user guide for buffered only the how to build.
TIA

fubr

02-20-2004, 02:15 AM

Weed2004

06-05-2004, 03:20 AM

Howdy all, been doing a lot of reading re: buffered jtags and have started gathering components to go with Chupy's guide i found here. All of the schematics ive seen so far depict a 74_244 octal buffer..which happens to be a noninverting buffer... problem is i dont live near a real electronics store and must settle for ratshack crap... Ive visited/called 8 of the stores in my area but none carry the 74_244 series and have in fact stopped stocking them. My question is: Can i use 74_240 which is an octal buffer 3-state inverter (same thing as a 74_244 but output is inverted) and then run the outputs thru a hex inverter chip (both of which are currently stocked at ratshack)? I personally dont see why you couldnt do this, but then again im not a real electro-gizmo kind of guy... and any input from those wiser than i would be appreciated. Thanks in advance

...oh.. i know i can mail order from mouser or digikey...but seems so wasteful to order only one $1.29 chip... ::sigh::

volki

06-06-2004, 04:23 PM

ok, tried numerous times to download the above listed file for making your own buffered JTAG. it will not download, and it is not a problem with my computer, have downloaded other files with no problems. also checked the download section with no success. can someone please send me a link on a schematic/instructions for building your own buffered JTAG?

spyder98

07-20-2004, 07:02 AM

Just wanted to know if a sd74AC245
OCTAL BUS TRANSCEIVER
WITH 3 STATE OUTPUTS (NON INVERTED)
Would also work?
Thanks
Spyder98