Smart-Frac
After all the pins have been renamed and pin_types resolved, Smart-Frac runs on the internal pin database and uses a proprietary advanced sorting algorithm to create the 2 SDL Template files.
- It finds and slices multi-level busses into manageable Chunks
- It finds and groups diff_pairs and adds the dpair modifier to reduce the amount of match_statements necessary to define the symbols
- It separates I/O and power signals into 2 groups of MATCH_STATEMENTS
- typically the POWER pins will not need to be sliced into smaller buses since they will just be added onto a symbol in large chunks
- typically the POWER pins will not need to be sliced into smaller buses since they will just be added onto a symbol in large chunks
- It auto assigns the left locator to inputs, the right locator to outputs and a CHOOSE_SIDE placeholder locator for all other signal types
These provide the user a head start to create the SDL
- auto_SDL_template.txt
- Plain text file for use with a text editor.
- auto_SDL_template.csv
- csv file to edit in EXCEL or another spreadheet editor
If no SDL file is selected in the SYMBOL_DESCRIPTION_FILE entry, PartBuilder will copy the auto_SDL_template.txt to a file called symbol_order_from_template.sdl, and set the SYMBOL_DESCRIPTION_FILE entry to point to that file. This gives the user the Intital Symbol Description Language file to work on.
The SDL creation process then becomes a matter of
- organizing the pre-generated MATCH_STATEMENTS into SYMBOL_DEFINTION wrappers
- changing the LOCATOR elements to place the pins onto the desired the side of the symbols
- adding SPACER directives to tweak the layout of the symbols
When the user goes to save the SDL file from the SDL-EDITOR PartBuilder checks to see if it is named "symbol_order_from_template.sdl" and if it is, it will prompt the user to save it as a new file name so that the working sdl file won't be overwritten the next time Smart-Frac Runs
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