Donny/rx tb

[DonnyC123]

Updated rx_tb chain

[Copilot]

Pull request overview

This PR refactors the RX testbench to exercise the full receive chain through the FIFO/AXI-stream path instead of the older direct payload outputs. It aligns rx_tb with the repository’s generic cocotb infrastructure and adds a wrapper/topology that matches the newer RX datapath structure.

Changes:

• Reworks rx_top to connect ethernet_assembler into rx_fifo_ctrl, with a new rx_top_wrapper exposing the internal AXI stream used by cocotb.
• Replaces the legacy RX transaction/scoreboard flow with generic testbench pieces: driver, event monitor, model, checker, and shared test base.
• Updates the runner/tests and tweaks FIFO control buffering/depth to support the end-to-end RX path.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
rx_tb/tb/rx_transaction.py	Removes the legacy direct-output RX transaction type.
rx_tb/tb/rx_test_base.py	Adds a shared RX cocotb base wired to the generic driver/monitor/model/checker stack.
rx_tb/tb/rx_test.py	Rewrites RX tests around the new wrapper/test-base flow and randomized traffic scenarios.
rx_tb/tb/rx_tb_runner.py	Updates the cocotb runner to build the new wrapper/topology and auto-select a simulator.
rx_tb/tb/rx_sequence.py	Publishes expected frame notifications while driving encoded RX traffic.
rx_tb/tb/rx_scoreboard.py	Removes the legacy RX scoreboard implementation.
rx_tb/tb/rx_model.py	Adds a simple model that queues expected frame bytes for checking.
rx_tb/tb/rx_event_monitor.py	Adds an AXI-stream event monitor that reconstructs packets from m_axi.
rx_tb/tb/rx_driver.py	Adds an RX driver bound to the source clock domain.
rx_tb/tb/rx_checker.py	Adds a custom checker for expected-vs-received packet matching.
rx_tb/rtl/rx_top_wrapper.sv	Introduces a cocotb-facing wrapper with dual clocks/resets and internal AXI interface.
rx_tb/rtl/rx_top.sv	Refactors the RX RTL to emit AXI traffic through rx_fifo_ctrl instead of raw output signals.
rx_fifo/rtl/rx_fifo_ctrl.sv	Adjusts buffering/full-handling logic and increases FIFO depth.
descrambler/rtl/descrambler.sv	Cleans up formatting and removes debug print logic.
bubbler/rtl/bubbler.sv	Cleans up formatting and removes debug print logic.

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[katiaohmacht]

looks good