'UART with software accessible FIFO - SX52 and SX k'
|part 0 4423 bytes
Yes, soldering SMD is a major pain if you jump the gun like I did and order
an 160-8404-02 adapter from http://www.adapters.com for about $65 and manually
solder the SMD to the adapter (see the compilation of advice on my techref
page at http://www.geocities.com/SiliconValley/Lab/3544/smds.htm or
http://22.214.171.124/techref/default.asp and I have a PCL print file that
produces a nice little paper label for the back of the wire wrap adapter if
anyone else is working with the 5 port SX chip and using the 180-8404-07
adapter. I will email if anyone interested) but Eric was kind enough to
point me to two suppliers of PQFP socket adapters that are less expensive
than the board adapter and should be no sweat to pop the chips into. I will
order one soon but do not have direct experience with them at this point.
Enplas-Tesco: http://www.enplas.com/prod/qfp.htm has relatively inexpensive
test and burn-in clamshell sockets. Part number OTQ-52-0.65-02 for the SX52,
and OTQ-48-0.5-01 for the SX48. Prices under $30 for small quantities of
both of these.
Welss CTI http://www.wellscti.com/ser7000.htm sockets, 7010-052-X-08 for the
SX52 at $27.20 qty 1-25 and 7007-048-X-07 for the SX48.
When the part goes to production, the SMD will be smaller and cheaper to
The problem is that at this point I haven't been able to get the pre-release
SX52's Scenix was kind enough to send me to work. My SX-Key REV E will not
talk to the chip at all (assuming I have it wired correctly: Scenix hasn't
responded to my 99/06/04 post on the TechSupport Newsgroup at
http://www.scenix.com/support/bbs/index.html regarding the position of pin
one) and I have heard the same from other developers. I think the part
probably does work just fine under lab conditions at Scenix or in the hands
of a real pro using real programmers or ICE.
The SX-Key is a WONDER OF MAGIC and I love it and I can't fault them for not
supporting a not yet released device with it. Parallax has not responded to
my email sent on 99/06/04 regarding their support for the 52:
<BLOCKQUOTE AUTHOR="JAMES NEWTON">I just got the new sx52PQFP from scenix
and connected the sx-key Rev E to it. I used the sx key software versions
1.0 and 1.07 (both, 07 first) and can't get anything other than "chip
connect failed." except for one time when the example.src apparently
programmed into the chip. It wont run, or debug.
Has anyone worked with the 52 yet?
When I know more I will post. I'm sure we will get it working. Having 5 full
ports more memory and timers on board is just to good to ignore.
<BLOCKQUOTE AUTHOR="RUSS MILLER">In addition to Ben Stragnell's free
programmer here are some links to other SX assemblers and programmers.
Other tools including SX definitions for GPASM and microchip-style mnemonic
macros for the SX-Key software: http://www.svtehs.com/scenix.htm
Parallax also offers the assembled and tested SX-Blitz programmer (with SX28
sample) for $59US. It uses the same freely downloadable win 95/NT4 IDE as
the SX-Key programmer debugger but does not include debug, clock generator
or ocscal calibration functions. The SX-Blitz comm protocol is available:
Pavel Baranov's c2c windows version supports the SX-Blitz directly using
The education price for the minimal SX-Key package is(Skeleton Key=SX-Key +
print manual) is $169.15US (15% off regular $199)
The one thing I can't get over is that the SX-Key package allows you to
debug, watch registers by variable name, single step, ... in short full ICE
from INSIDE THE CHIP!!!!! I worked with z80s and 8080s some time ago and ran
into many, many issues where the circuit worked fine with ICE or a logic
analyzer in place (even at speed - not bad circuit design) and failed
intermittently with production parts in place. Just the touch of the probe
was enough to smooth out the timing or jitter or loading or whatever was
actually causing the chip to miss the signal or not put out the signal in
exactly the right way. With the sx-key, I see what the chip saw! I love that
James Newton, Electronic Forms Plus,
san.rr.com 1-619-674-9736 phone 1-619-674-9763 fax eplus1
Attachment converted: wonderland:James M. Newton.vcf (TEXT/CSOm) (00008772)
James Newton wrote:
> Scenix hasn't
> responded to my 99/06/04 post on the TechSupport Newsgroup at
> http://www.scenix.com/support/bbs/index.html regarding the position of pin
I can confirm from personal experience that pin one is the pin next to the
round indentation and beveled edge of the package.
If you look at the top of the chip with the silkscreened label oriented
to be read normally, pin one is at the lower left corner, and the pin numbers
increase in a counter-clockwise direction.
The pre-release SX52/48 silicon deviates from the serial programming spec
so that a special SX-Key is required to establish ISP communication.
Parallax built a number of non-standard SX-Keys for Scenix to support early
customers. Scenix is the sole distributor of this funky version.
We believe that the new silicon will work with the REV E. To support the
new features we are developing slightly different PC software which will be
posted as soon as we have samples to test it with.
Russ (sorry about the %@##$@ html post last night) Miller
Parallax, Inc (916) 624-8333 (toll free 888-512-1024)
James Newton wrote:
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