Maker Pro
Maker Pro

Good RA connector for external JTAG?

B

Ben Jackson

Jan 1, 1970
0
I need JTAG access on a board that's going to be mounted in a chassis.
My original thought was just to use a RA .100 pin header, but maybe
there's something like mini-DIN would be better. I'd have to make a
special cable, but it would be keyed and take up less board area.
Anyone have a connector they favor for JTAG use? Is there a standard
I haven't heard of?
 
N

Nico Coesel

Jan 1, 1970
0
Ben Jackson said:
I need JTAG access on a board that's going to be mounted in a chassis.
My original thought was just to use a RA .100 pin header, but maybe
there's something like mini-DIN would be better. I'd have to make a
special cable, but it would be keyed and take up less board area.
Anyone have a connector they favor for JTAG use? Is there a standard
I haven't heard of?

We had -more or less- the same problem when designing boards so they
can be programmed in a gang programmer (also self made). I think the
designer choose a smaller pitch 10 pin RA header and omit most of the
JTAG grounding pins.
 
M

Martin Riddle

Jan 1, 1970
0
2mm RA. You could easily make a 2mm to .100 adaptor on a small pcb. Buy a
handfull of IDC cables and your done.

cheers
 
R

Rich Grise

Jan 1, 1970
0
I need JTAG access on a board that's going to be mounted in a chassis.
My original thought was just to use a RA .100 pin header, but maybe
there's something like mini-DIN would be better. I'd have to make a
special cable, but it would be keyed and take up less board area.
Anyone have a connector they favor for JTAG use? Is there a standard
I haven't heard of?

Well, I don't know what "RA" means, but I've got a Xilinx developer kit
on loan from a client, and it just uses very ordinary 7-pin .1 SIP header
and IDC plugs. There's one blank pin if you want to key it.

Good Luck!
Rich
 
B

Ben Jackson

Jan 1, 1970
0
Well, I don't know what "RA" means, but I've got a Xilinx developer kit
on loan from a client, and it just uses very ordinary 7-pin .1 SIP header

"Right angle".

I've been looking around and it looks like everyone has invented their
own JTAG standard. The "new" Xilinx one is now a 2mm (I think) dual row
to get more grounds in. Altera uses a 2x5 .100" header (times two if
you use a serial EEPROM config).

I think to save "edge real estate" I'm just going to use RJ45 for the
debug headers, since they will not be confused with video, and take up
much less width/pin.
 
Top