I've been updating a few library symbols originally done under 16.3. When doing a "refresh padstacks" in the symbol editor, I get the following log file entry:
INFO: Design is an old-style flash design. Any thermal relief geometries will preserve name but set Geometry to Rectangle.
The library padstacks were done with flash symbols for thermals, but with new "fsm" symbols. The symbol is circa v16.3, so is not the "old style flash design" indicated. The results of the padstack refresh are indeed as indicated. In the design padstack, the thermals are shown with the flash symbol name, but the geometry has indeed been changed from "flash" to "rectangle".
Why?? The padstacks involved are not rectangular, nor are the flash symbols used. Also, on some footprint symbols, after the padstack refresh, the "update symbols" command does not list the thermal flash symbols as used. On some other symbols it does. Must be a new 16.6 "feature".
There is a user preference for "old_style_flash_symbols" which used to be enabled but is now disabled. See the Pad Designer section in the pcoms.pdf, in the doc\pcoms directory of the installation and this:
"New databases (in which the old_style_flash_symbols variable is disabled) draw the actual flash symbol .fsm geometry when you enable Thermal Pads, using true display of flashes and older data that has been updated to exploit this feature. See the flash_convert utility"
(flash_convert is documented in the fcoms.pdf, doc\fcoms directory of the installation)
In reply to oldmouldy:
Thanks OM - but I think my confusion is stemming from the "old style flash symbols" message.
I don't currently have any of those as defined by the flash_convert utility (pre 14.0 or bsm). All of my flash symbols have long since been updated to fsm format. Perhaps the uprev to 16.6 with the old_style_flash_symbols variable unchecked, still recognizes them as old style for some reason? But not consistently - -
Why would some symbols with a "pad refresh" get updated to show "rectangle" instead of "flash" padstack definitions and the flash symbol name is deleted from the dra list (shown when doing a "symbol update"), while some do not. A few of the symbols do not give me the conversion note when doing a padstack refresh. The refresh proceeds successfully, but the design's padstack definitions remain as "flash" thermal definitions and the flash name is still listed in the flash/shape symboll list.
The old_style_flash_symbols is unchecked and the show thermals is off in all of my symbol editor settings, since there are no plane connections to show at that level anyway.
I have re-ran flash_convert in batch mode on all my thermal symbols, as well as dbdoctor to uprev everything to compatibility with 16.5/6 file format. Still the inconsistency persists. I'm just concerned that this will cause problems later when using the symbols in a brd design (which I haven't gotten to just yet). Just trying to avert problems along the way.