Thread: What can I do with my semi-functional PW3 motherboard to help people out?
View Single Post
Old 05-06-2017, 10:39 AM   #21
Cinisajoy
Just a Yellow Smiley.
Cinisajoy ought to be getting tired of karma fortunes by now.Cinisajoy ought to be getting tired of karma fortunes by now.Cinisajoy ought to be getting tired of karma fortunes by now.Cinisajoy ought to be getting tired of karma fortunes by now.Cinisajoy ought to be getting tired of karma fortunes by now.Cinisajoy ought to be getting tired of karma fortunes by now.Cinisajoy ought to be getting tired of karma fortunes by now.Cinisajoy ought to be getting tired of karma fortunes by now.Cinisajoy ought to be getting tired of karma fortunes by now.Cinisajoy ought to be getting tired of karma fortunes by now.Cinisajoy ought to be getting tired of karma fortunes by now.
 
Cinisajoy's Avatar
 
Posts: 19,161
Karma: 83862859
Join Date: Jul 2015
Location: Texas
Device: K4, K5, fire, kobo, galaxy
Quote:
Originally Posted by knc1 View Post
geekmaster wrote (somewhere here) that there is a new 'standard' JTAG interface pin-out that minimizes the number of pins.
IIRC, the previous 'standard' was five (or seven or anyway a lot more than one ). *

But just one pin does sound a bit minimal, even if you pick up a ground connection from the somewhere on the board.

Hmm...
But the JTAG port could be wired to a "Dallas one-wire" interface chip, I am pretty sure they (the "Dallas one-wire" people) make such a device.
Then one pin (for anything) makes sense.

Note:
The Linux kernel has supported the "Dallas one-wire" devices for ages now.

Edit: (*)
Just had one of the old JTAG cables fall into my lap - a "JTAG-3 with SPI" cable.
Pins: TMS, TDI, TDO, TCK, GND, VDD (six pins).
And the other end of the cable is for a parallel port.

I don't think I still own a (working) computer with a parallel port.
So don't even ask me why I am keeping this adapter cable.
Because someday, you may need it.
Cinisajoy is offline   Reply With Quote