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Repetition
-----------------------
Repeated sections use array ([n]) syntax for the section name. The [0] section
should be complete, all the other repetitions should only have the word_index
set.
UNIMPLEMENTED: repeated sections could be packed/unpacked automatically (see
pack_array for macros)
HDL: Variables and Storage
-------------------------------------
Read-only nets are implemented
Mode Flags
----------------------
**r: Read**
**w: Write**
**p: Parameter**
A special read-only mode for compile-time constants. The slug name is
capitalized for HDL but lower case in other contexts.
**b: Doorbell**
UNIMPLEMENTED.
A new net with "_trig" suffix is created which is triggered on every write
transaction.
**m: Memory Block**
UNIMPLEMENTED.
Uses an address mask to read/write, eg, a BRAM or regfile instead of
exposing many individual registers.
**f: FIFO**
UNIMPLEMENTED.
Sets up a read or write FIFO.
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