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From: email@example.com (Nico Coesel)
Subject: Re: Sockets for TSOP 64
Date: Sat, 14 Sep 2002 09:36:25 GMT
References: <3D828A59.CDA3247C@webaccess.net> <3D82DA1F.2C249F96@webaccess.net>
NNTP-Posting-Date: Sat, 14 Sep 2002 09:26:54 +0000 (UTC)
X-Newsreader: Forte Free Agent 1.21/32.243
Chuck Simmons wrote:
>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.
Do the boards have a serial port? Were I work we only put a small
bootloader into the flash of a uC. This bootloader allows us to upload
& start any piece of software into the board (either in flash or ram).
I have a feeling that this method may be suitable for you as well.
You could ommit the flash and mount a RAM chip on the evaluation board
and have your evaluation customers upload software through the serial
Reply to nico@nctdevpuntnl (punt=.)
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