[Milkymist-devel] [JTAG/Serial] RC2 status
adam at sharism.cc
Mon Jul 11 01:12:47 PDT 2011
The 200pcs of assembled JTAG daughter boards is done.
1. smt factory assembled 195 full parts mounted excepts lost 5pcs 12 MHz
Xtal parts. This is quite bad. :(
After i checked first panel with 6 pieces on polarity checks, pin1 checks,
first two piece with functionality work on JTAG and serial connections. I
came back to wait. :-)
later i removed last rc1's part to rc2 5 boards, they are all
2. after followed test procedures Step1: current test firstly,
got one obvious soldering short by my visual inspection but pass in current
test. well...while i tested each jtag board, i still visually inspected on
mounted status. this way didn't completely auto though. U5 pin 31 is 3.3V
which shorted to pin30, It's ACBUS4 that it's useless.
I have no smart way that can detect out if short pins still there, since the
current won't be a big difference. if someone have new idea, you can share
3, then follow step 2 ~ 4 for each test:
I got all 100% yield rate of PASS.
This way means that i used a Milkymist One board to do the tests about
plug-in/plug-out actions on J5 and J6 at least 400 times completely in two
Next time i may do an extend parallel cable to connect my J6 to be as
for whole steps of this run, check
Comparing to previous runs, my observations on this new smt factory:
1, poor import parts control
2, very good mounted smt process results
3, not bad internal quality human checks
4, each returned parts has been re-counted, this is good for preparation for
5, not openly to take videos
It's good that we have this factory as other source now.
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