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Dangerous Prototypes

Dangerous Prototypes => Bus Blaster JTAG debugger => Topic started by: brian on August 06, 2011, 03:48:12 am

Title: Bus Blaster 2.1b?
Post by: brian on August 06, 2011, 03:48:12 am
There doesn't seem to be any open thread for design comment. I finally started using my bus blaster today. The only item immediately apparent is that it would be more convenient if the 20 pin header were rotated 180 degrees. For all the development boards I have the current alignment requires the board to be either upside down or have the cable over the board. Perhaps tab in placement of the dev board header isn't universal though and it would just cause equal awkwardness for other boards with the other placement. Also could be worse for layout as the pins on the edge are GND I guess.
Title: Re: Bus Blaster 2.1b?
Post by: sqkybeaver on August 06, 2011, 08:23:25 am
i have run into the same problem with dev boards made by the chip manufacturers.

longer cables can fix this, or you can chose to find something else to be annoyed about, one way or another there is always a drawback, and cable orientation is usually the least of a designers worries.
Title: Re: Bus Blaster 2.1b?
Post by: ian on August 06, 2011, 11:38:52 am
Maybe we can get a header with a key on both sides? I have seen that before.
Title: Re: Bus Blaster 2.1b?
Post by: brian on August 06, 2011, 03:34:06 pm
[quote author="sqkybeaver"]i have run into the same problem with dev boards made by the chip manufacturers.

longer cables can fix this, or you can chose to find something else to be annoyed about, one way or another there is always a drawback, and cable orientation is usually the least of a designers worries.[/quote]

It isn't a major issue, I just didn't know if there was a quasi standard. My two other JTAGs have it the way that doesn't have the folding. It is fine though one of them is in a case so who knows maybe the board is upside down :-)
Title: Re: Bus Blaster 2.1b?
Post by: brian on August 06, 2011, 03:37:41 pm
[quote author="ian"]Maybe we can get a header with a key on both sides? I have seen that before.[/quote]

The pins would still need to be reversed. Given sqkybeaver's remark, I am sorry I mentioned it. I was thinking of seeing if I could spoof Ti's ICDI with the Bus Blaster. (I'll put it on my infinite todo list).
Title: Re: Bus Blaster 2.1b?
Post by: sqkybeaver on August 06, 2011, 03:48:44 pm
the orientation of the connector on the end of the cable can be swapped, but ends twisting the cable.

another option is using a connector where the wires leave the connector perpendicular to the board.
Title: Re: Bus Blaster 2.1b?
Post by: ian on August 06, 2011, 03:50:08 pm
Duh, you're totally right :D
Title: Re: Bus Blaster 2.1b?
Post by: ian on August 06, 2011, 03:50:34 pm
But hey - how about a 90 degree connector? better under than over?
Title: Re: Bus Blaster 2.1b?
Post by: sqkybeaver on August 06, 2011, 04:11:59 pm
ill dig out an adapter i made years ago, and post a photo at some point, give an idea how things can be cheated.
Title: Re: Bus Blaster 2.1b?
Post by: sqkybeaver on August 06, 2011, 04:50:36 pm
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