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From: Gary Tait
Subject: Re: Sockets for TSOP 64
X-Newsreader: Forte Agent 1.92/32.572 trialware
Date: Sat, 14 Sep 2002 00:10:14 -0400
NNTP-Posting-Date: Sat, 14 Sep 2002 00:06:38 EDT
Organization: WorldCom Canada Ltd. News Reader Service
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
Why not load the form Jtag?
>Are there better sockets for these parts? We have a solution in mind but
>which is slightly ugly and a bit expensive (price is not a huge concern
>given the development boards are cost the earth anyway).
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