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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Sockets for TSOP 64
Date: Sat, 14 Sep 2002 06:41:52 GMT
NNTP-Posting-Date: Fri, 13 Sep 2002 23:41:52 PDT
Gary Tait wrote:
> On Sat, 14 Sep 2002 01:01:29 GMT, Chuck Simmons
> >I think the package is called TSOP 64. It has about 20 mil pin pitch and
> >the pins are on two sides of the package instead of all around. These
> >are flash parts and our programmer has a Yamaichi socket that releases
> >by pressing down (the pins are clamped from above by the contacts) and
> >our development board (which cannot do programming) has a Yamaichi clam
> >shell type socket (the pins are contacted from below).
> >We have successfully used similar sockets to the first type with parts
> >having up to 100 pins and the second type works well for us in a 128 pin
> >model and a 208 pin model. We are not able to get reliable operation
> >with either socket for more than a minute or two with the flash parts.
> >That is, it can take 5 or 10 reseating attempts to get a part to program
> >and then we move it to the development board and it is hit or miss
> >whether the board will boot. The board itself is OK because it runs
> >perfectly from soldered down SRAM loaded through a JTAG interface.
> >Unfortunately, it is not in our plan ever to solder down the flash on
> >the development boards (we theoretically can program flash through an
> >ATAPI interface but we don't have anyone to develop host side drivers to
> >do it). Thus we have to have removable flash in our lab and we have to
> >distribute preprogrammed flash parts to customers with development
> >boards even though they have JTAG load capability at some stations in
> >their labs.
> Why not load the form Jtag?
1) I was one of the chip architects and I have very strong ideas about
how to develop with buried microprocessors in multiple chips. Important
is making development on one chip relatively independent of development
on the other. Flash loading is an important part of that.
2) The last time we built code for a marketing road show, we did it ten
minutes before the guy left the building. We use our lab development
boards on the road because customers want to see how they can get a jump
start with our parts. We give them option city. The stupid board is a
forest of test points and option jumpers (we ship evaluation boards with
jumpers set for our final test which is full operation with known third
3) A board has to go out working. This takes hours on each board but we
have to ship something that starts the customer at our baseline and that
is a moving target. The flash that ships worked in our lab on the day we
built it using the sources current that day and customer supplied
external hardware when possible. (OK, we are a loose cannon but the
parts really work.)
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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