Subversion Repositories xge_mac

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10GE MAC Core

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1. Directory Structure

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The directory structure for this project is shown below.

.

|-- doc                 - Documentation files

|

|-- rtl

|   |-- include         - Verilog defines and utils

|   `-- verilog         - Verilog source files for xge_mac

|

|-- sim

|   |-- systemc         - SystemC simulation directory

|   `-- verilog         - Verilog simulation directory

|

`-- tbench

    |-- systemc         - SystemC test-bench source files

    `-- verilog         - Verilog test-bench source files

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2. Simulation

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There are two simulation environments that can be used to validate the code.

The verilog simulation is very basic and meant for those who want to look

at how the MAC operates without going through the effort of setting up SystemC.

The SystemC environment is more sophisticated and covers all features of the MAC.

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2.1 Verilog Simulation

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To run the verilog simulation, compile all project files under rtl/verilog along with

top level testbench file:

  - tbench/verilog/tb_xge_mac.v

There is a Modelsim "do" file called "sim.do" under sim/verilog for those using Modelsim.

Once all the files are compiled, start simulation using entity "tb".

The verilog simulation reads packets from "packet_tx.txt" and writes them to the MAC

transmit fifo using the packet transmit interface (pkt_tx_data). As frames become

available in the transmit fifo, the MAC calulates the CRC and sends them out on xgmii_tx.

The xgmii_tx interface is looped-back to xgmii_rx in the testbench. The frames are thus

processed by the MAC receive engine and stored in the receive fifo. The testbench reads

frames from the receive interface (pkt_rx_data) and prints out the results.

Simulation output:

  ------------------------

  Received Packet

  ------------------------

  0000010000010010

  9400000288b50001

  0203040506070809

  0a0b0c0d0e0f1011

  1213141516171819

  1a1b1c1d1e1f2021

  2223242526272829

  2a2b2c2d2e2f3031

  3233343506b33d40

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  All packets received. Sumulation done!!!

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2.2 SystemC Simulation

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In order to use the SystemC environment it is required to first install SystemC from

www.systemc.org. Free membership may be required to download the core SystemC files.

The testbench was developed and tested with Verilator, a free HDL simulator that

compiles verilog into C++ or SystemC code. You can download Verilator from

www.veripool.org. You also need to install SystemPerl and Verilog-Perl for waveform

traces.

Add the following exports to your .bashrc file, adjust based on your version:

  export SYSTEMC=/opt/systemc-2.3.1a

  export SYSTEMC_INCLUDE=/opt/systemc-2.3.1a/include   # with systemc.h

  export SYSTEMC_LIBDIR=/opt/systemc-2.3.1a/lib    # with libsystemc.a

  export VERILATOR_ROOT=/opt/verilator-3.900

  export SYSTEMPERL=/opt/SystemPerl-1.344

  export LD_LIBRARY_PATH=/opt/systemc-2.3.1a/lib-linux64

Once all the required tools are installed:

  - Move to directory sim/systemc

  - Type "./compile.sh"

  - Type "./run.sh"

If the simulation is running correctly you should see messages from the scoreboard

as packets are transmited and received on the various interfaces.

Simulation output:

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    Packet size

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    SCOREBOARD XGMII INTERFACE TX (60)

    SCOREBOARD XGMII INTERFACE TX (60)

    SCOREBOARD PACKET INTERFACE TX (50)

    SCOREBOARD XGMII INTERFACE TX (60)

    SCOREBOARD PACKET INTERFACE TX (51)

    SCOREBOARD XGMII INTERFACE TX (60)

    SCOREBOARD PACKET INTERFACE RX (TX SIZE=60  RX SIZE=60)

    ...