[Moore] The system function like $urandom, $urandom_range, etc.

Could anyone provide guidance on how to represent the system function like `$urandom` in the IR? As I am not familiar with Chisel and FIRRTL, I am particularly interested in understanding how `sbt` or the FIRRL parser manages this. Thanks for any help in advance :smile:.

The issue mentions Chisel, FIRRTL, and sbt but names no files, tests, or entry points. Start by locating the FIRRTL parser and existing handling of system functions, then ask maintainers to confirm the intended IR representation for $urandom and related functions. Done would require an agreed design and corresponding implementation scope.

Written by the indexing model from the issue text.