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Thu Jun 25 13:12:14 CEST 2009

IDC debug pinouts


So, what's the standard way of numbering 2x5 ribbon cable?  Judging
from the blades, pin 1 is either in lower left or upper right.  I'm
taking the layout I find in standard IDE cables, which puts pin 1 in
lower left with the gap on the bottom.

---------------
|  2 4 6 8 10 |
|  1 3 5 7 9  |
------   ------

The connector that's mounted on top of this maps the pins to this
pattern to connect to the ribbon cable with pin 1 marked Red, and the
other pins Grey.

  2   4   6   8   10
1 | 3 | 5 | 7 | 9 |
| | | | | | | | | |
R G G G G G G G G G

Let's fix it like this: pin 1 of the IDC is mapped to pin 1 (GND) of
the TTL serial.  The 1x6 connector seems to fit in the 2x5 ridged
header plug.

1 GND    2 PGM
3 MCLR   4 PGC (green)
5 VDD    6 PGD (blue)
7 RX     8 SD
9 TX    10 SC

Maybe one more modification.  To have the programming lines accessible
through a 2x3 is maybe not so important as having the power + I2C
lines available?


[1] entry://20090606-125114
[2] http://en.wikipedia.org/wiki/Insulation-displacement_connector



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