On Tue, Mar 13, 2007 at 12:04:12PM -0400, Richard Smith wrote:
Ward Vandewege wrote:
Of course its never that simple. The problem with just adding a 3.3V regulator in line to the flash sockets is that the 8255 outputs are still 5V. So you either need to add some 3.3V buffers with 5V tolerant inputs or use flash chips that are 5V tolerant.
Three 74LVX245 could be used as buffers. Note this design works for parallell flash only.
For LPC there's at least one popular design called CheapLPC:
http://www.warmcat.com/milksop/cheapLPC.html
(Hi Andy! :)
This works for any LPC/FWH flash, not just the SST ones.
If you feel like experimenting with your soldered-on PLCC you can wire this up to a PLCC socket so that it fits a chip inserted upside-down in the socket. Then you just try put the socket on top of the soldered-on chip on the mobo. It may or may not work depending on what the flash chip is connected to. I would strongly recommend trying this only when the mainboard is not powered.
//Peter