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[la_iocut](./rtl/la_iocut.v) | Supply | Power ring cutter
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## PARAMETERS
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### CFGW
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The `CFGW` parameter defines the width of the configuration bus of the io cell. IO cells generally include a set of configuration inputs for things like drive strength and operating modes. Setting `CFGW` to a large value (eg. 16/32) should have zero impact on the design as the extra bus bits get optimized away during implementation.
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The `CFGW` parameter defines the width of the configuration bus of the io cell. IO cells generally include a set of configuration inputs for things like drive strength and operating modes. Setting `CFGW` to a large value (eg. 16/32) should have zero impact on the design as the extra bus bits get optimized away during implementation.
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For la_bidir, the first 8 bits of the configuration bus are reserved for the functionality shown in the table below.
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@@ -38,13 +37,44 @@ For la_bidir, the first 8 bits of the configuration bus are reserved for the fun
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CFG[7:4] | drive strength |
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#### RINGW
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The `RINGW` parameter specifies the number of signals within the power bus that connects all of the io cells together within the padring.
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The `RINGW` parameter specifies the number of signals within the power bus that connects all of the io cells together within the padring.
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### SIDE
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The `SIDE` parameter indicates the placement of a cell instances within a padring.Legal values for `SIDE` are: "NO" (north/top), "EA" (east/right), "WE" (west/left), "SO" (south/bottom). The parameter can be used by the technology specific implementation of `iolib` to selec the native orientation of the cell. Modern process nodes place restrictions on the orientation of transistors and include vertical and horizontal version of all active io cells.
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The `SIDE` parameter indicates the placement of a cell instances within a padring.Legal values for `SIDE` are: "NO" (north/top), "EA" (east/right), "WE" (west/left), "SO" (south/bottom). The parameter can be used by the technology specific implementation of `iolib` to selec the native orientation of the cell. Modern process nodes place restrictions on the orientation of transistors and include vertical and horizontal version of all active io cells.
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### PROP
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The `PROP` parameter can be used by the technology specific `iolib` implementation to select between different variants of the `iolib` cell type. The `PROP` parameter is library specific and should only be used when absolutely necessary. Using this parameter means technology/ip information permeates up through the design (nullifying the benefits of lambdalib).
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