corundum/fpga/lib/eth/README.md

# Verilog Ethernet Components Readme

For more information and updates: http://alexforencich.com/wiki/en/verilog/ethernet/start

GitHub repository: https://github.com/alexforencich/verilog-ethernet

## Introduction

Collection of Ethernet-related components for gigabit, 10G, and 25G packet
processing (8 bit and 64 bit datapaths).  Includes modules for handling
Ethernet frames as well as IP, UDP, and ARP and the components for
constructing a complete UDP/IP stack.  Includes MAC modules for gigabit and
10G/25G, a 10G/25G PCS/PMA PHY module, and a 10G/25G combination MAC/PCS/PMA
module.  Includes various PTP related components for implementing systems that
require precise time synchronization.  Also includes full MyHDL testbench with
intelligent bus cosimulation endpoints.

For IP and ARP support only, use ip_complete (1G) or ip_complete_64 (10G/25G).

For UDP, IP, and ARP support, use udp_complete (1G) or udp_complete_64
(10G/25G).

Top level gigabit and 10G/25G MAC modules are eth_mac_*, with various
interfaces and with/without FIFOs.  Top level 10G/25G PCS/PMA PHY module is
eth_phy_10g.  Top level 10G/25G MAC/PCS/PMA combination module is
eth_mac_phy_10g.

PTP components include a configurable PTP clock (ptp_clock), a PTP clock CDC
module (ptp_clock_cdc) for transferring PTP time across clock domains, and a
configurable PTP period output module for precisely generating arbitrary
frequencies from PTP time.

## Documentation

### arp module

ARP handling logic with parametrizable retry timeout parameters.

### arp_64 module

ARP handling logic with parametrizable retry timeout parameters and 64 bit
datapath for 10G/25G Ethernet.

### arp_cache module

Basic hash-based cache for ARP entries.  Parametrizable depth.  

### arp_eth_rx module

ARP frame receiver.

### arp_eth_rx_64 module

ARP frame receiver with 64 bit datapath for 10G/25G Ethernet.

### arp_eth_tx module

ARP frame transmitter.

### arp_eth_tx_64 module

ARP frame transmitter with 64 bit datapath for 10G/25G Ethernet.

### axis_eth_fcs module

Ethernet frame check sequence calculator.

### axis_eth_fcs_64 module

Ethernet frame check sequence calculator with 64 bit datapath for 10G/25G
Ethernet.

### axis_eth_fcs_check module

Ethernet frame check sequence checker.

### axis_eth_fcs_insert module

Ethernet frame check sequence inserter.

### axis_gmii_rx module

AXI stream GMII/MII frame receiver with clock enable and MII select.

### axis_gmii_tx module

AXI stream GMII/MII frame transmitter with clock enable and MII select.

### axis_xgmii_rx_32 module

AXI stream XGMII frame receiver with 32 bit datapath.

### axis_xgmii_rx_64 module

AXI stream XGMII frame receiver with 64 bit datapath.

### axis_xgmii_tx_32 module

AXI stream XGMII frame transmitter with 32 bit datapath.

### axis_xgmii_tx_64 module

AXI stream XGMII frame transmitter with 64 bit datapath.

### eth_arb_mux module

Ethernet frame arbitrated muliplexer with parametrizable data width and port
count.  Supports priority and round-robin arbitration.

### eth_axis_rx module

Ethernet frame receiver.

### eth_axis_rx_64 module

Ethernet frame receiver with 64 bit datapath for 10G/25G Ethernet.

### eth_axis_tx module

Ethernet frame transmitter.

### eth_axis_tx_64 module

Ethernet frame transmitter with 64 bit datapath for 10G/25G Ethernet.

### eth_demux module

Ethernet frame demuliplexer with parametrizable data width and port count.
Supports priority and round-robin arbitration.

### eth_mac_1g module

Gigabit Ethernet MAC with GMII interface.

### eth_mac_1g_fifo module

Gigabit Ethernet MAC with GMII interface and FIFOs.

### eth_mac_1g_gmii module

Tri-mode Ethernet MAC with GMII/MII interface and automatic PHY rate
adaptation logic.

### eth_mac_1g_gmii_fifo module

Tri-mode Ethernet MAC with GMII/MII interface, FIFOs, and automatic PHY rate
adaptation logic.

### eth_mac_1g_rgmii module

Tri-mode Ethernet MAC with RGMII interface and automatic PHY rate adaptation
logic.

### eth_mac_1g_rgmii_fifo module

Tri-mode Ethernet MAC with RGMII interface, FIFOs, and automatic PHY rate
adaptation logic.

### eth_mac_10g module

10G/25G Ethernet MAC with XGMII interface.  Datapath selectable between 32 and
64 bits.

### eth_mac_10g_fifo module

10G/25G Ethernet MAC with XGMII interface and FIFOs.  Datapath selectable
between 32 and 64 bits.

### eth_mac_mii module

Ethernet MAC with MII interface.

### eth_mac_mii_fifo module

Ethernet MAC with MII interface and FIFOs.

### eth_mac_phy_10g module

10G/25G Ethernet MAC/PHY combination module with SERDES interface.

### eth_mac_phy_10g_fifo module

10G/25G Ethernet MAC/PHY combination module with SERDES interface and FIFOs.

### eth_mac_phy_10g_rx module

10G/25G Ethernet MAC/PHY combination module with SERDES interface, RX path.

### eth_mac_phy_10g_tx module

10G/25G Ethernet MAC/PHY combination module with SERDES interface, TX path.

### eth_mux module

Ethernet frame muliplexer with parametrizable data width and port count.
Supports priority and round-robin arbitration.

### eth_phy_10g module

10G/25G Ethernet PCS/PMA PHY.

### eth_phy_10g_rx module

10G/25G Ethernet PCS/PMA PHY receive-side logic.

### eth_phy_10g_rx_ber_mon module

10G/25G Ethernet PCS/PMA PHY BER monitor.

### eth_phy_10g_rx_frame_sync module

10G/25G Ethernet PCS/PMA PHY frame synchronizer.

### eth_phy_10g_tx module

10G/25G Ethernet PCS/PMA PHY transmit-side logic.

### gmii_phy_if module

GMII/MII PHY interface and clocking logic.

### ip module

IPv4 block with 8 bit data width for gigabit Ethernet.  Manages IPv4 packet
transmssion and reception.  Interfaces with ARP module for MAC address lookup.

### ip_64 module

IPv4 block with 64 bit data width for 10G/25G Ethernet.  Manages IPv4 packet
transmssion and reception.  Interfaces with ARP module for MAC address lookup.

### ip_arb_mux module

IP frame arbitrated muliplexer with parametrizable data width and port count.
Supports priority and round-robin arbitration.

### ip_complete module

IPv4 module with ARP integration.

Top level for gigabit IP stack.

### ip_complete_64 module

IPv4 module with ARP integration and 64 bit data width for 10G/25G Ethernet.

Top level for 10G/25G IP stack.

### ip_demux module

IP frame demuliplexer with parametrizable data width and port count.
Supports priority and round-robin arbitration.

### ip_eth_rx module

IP frame receiver.

### ip_eth_rx_64 module

IP frame receiver with 64 bit datapath for 10G/25G Ethernet.

### ip_eth_tx module

IP frame transmitter.

### ip_eth_tx_64 module

IP frame transmitter with 64 bit datapath for 10G/25G Ethernet.

### ip_mux module

IP frame muliplexer with parametrizable data width and port count.
Supports priority and round-robin arbitration.

### lfsr module

Fully parametrizable combinatorial parallel LFSR/CRC module.

### mii_phy_if module

MII PHY interface and clocking logic.

### ptp_clock module

PTP clock module with PPS output.  Generates both 64 bit and 96 bit timestamp
formats.  Fine frequeny adjustment supported with configurable fractional
nanoseconds field.

### ptp_clock_cdc module

PTP clock CDC module with PPS output.  Use this module to transfer and deskew a
free-running PTP clock across clock domains.  Supports both 64 and 96 bit
timestamp formats.

### ptp_ts_extract module

PTP timestamp extract module.  Use this module to extract a PTP timestamp
embedded in the tuser sideband signal of an AXI stream interface.

### ptp_perout module

PTP period output module.  Generates a pulse output, configurable in absolute
start time, period, and width, based on PTP time from a PTP clock.

### rgmii_phy_if module

RGMII PHY interface and clocking logic.

### udp module

UDP block with 8 bit data width for gigabit Ethernet.  Manages UDP packet
transmssion and reception.

### udp_64 module

UDP block with 64 bit data width for 10G/25G Ethernet.  Manages UDP packet
transmssion and reception.

### udp_arb_mux module

UDP frame arbitrated muliplexer with parametrizable data width and port
count.  Supports priority and round-robin arbitration.

### udp_checksum_gen module

UDP checksum generator module.  Calculates UDP length, IP length, and
UDP checksum fields.

### udp_checksum_gen_64 module

UDP checksum generator module with 64 bit datapath.  Calculates UDP
length, IP length, and UDP checksum fields.

### udp_complete module

UDP module with IPv4 and ARP integration.

Top level for gigabit UDP stack.

### udp_complete_64 module

UDP module with IPv4 and ARP integration and 64 bit data width for 10G
Ethernet.

Top level for 10G/25G UDP stack.

### udp_demux module

UDP frame demuliplexer with parametrizable data width and port count.
Supports priority and round-robin arbitration.

### udp_ip_rx module

UDP frame receiver.

### udp_ip_rx_64 module

UDP frame receiver with 64 bit datapath for 10G/25G Ethernet.

### udp_ip_tx module

UDP frame transmitter.

### udp_ip_tx_64 module

UDP frame transmitter with 64 bit datapath for 10G/25G Ethernet.

### udp_mux module

UDP frame muliplexer with parametrizable data width and port count.
Supports priority and round-robin arbitration.

### xgmii_baser_dec_64 module

XGMII 10GBASE-R decoder for 10G PCS/PMA PHY.

### xgmii_baser_enc_64 module

XGMII 10GBASE-R encoder for 10G PCS/PMA PHY.

### xgmii_deinterleave module

XGMII de-interleaver for interfacing with PHY cores that interleave the
control and data lines.

### xgmii_interleave module

XGMII interleaver for interfacing with PHY cores that interleave the control
and data lines.

### Common signals

    tdata   : Data (width generally DATA_WIDTH)
    tkeep   : Data word valid (width generally KEEP_WIDTH, present on _64 modules)
    tvalid  : Data valid
    tready  : Sink ready
    tlast   : End-of-frame
    tuser   : Bad frame (valid with tlast & tvalid)

### Source Files

    rtl/arp.v                       : ARP handling logic
    rtl/arp_64.v                    : ARP handling logic (64 bit)
    rtl/arp_cache.v                 : ARP LRU cache
    rtl/arp_eth_rx.v                : ARP frame receiver
    rtl/arp_eth_rx_64.v             : ARP frame receiver (64 bit)
    rtl/arp_eth_tx.v                : ARP frame transmitter
    rtl/arp_eth_tx_64.v             : ARP frame transmitter (64 bit)
    rtl/eth_arb_mux.py              : Ethernet frame arbitrated multiplexer generator
    rtl/axis_eth_fcs.v              : Ethernet FCS calculator
    rtl/axis_eth_fcs_64.v           : Ethernet FCS calculator (64 bit)
    rtl/axis_eth_fcs_insert.v       : Ethernet FCS inserter
    rtl/axis_eth_fcs_check.v        : Ethernet FCS checker
    rtl/axis_gmii_rx.v              : AXI stream GMII/MII receiver
    rtl/axis_gmii_tx.v              : AXI stream GMII/MII transmitter
    rtl/axis_xgmii_rx_32.v          : AXI stream XGMII receiver (32 bit)
    rtl/axis_xgmii_rx_64.v          : AXI stream XGMII receiver (64 bit)
    rtl/axis_xgmii_tx_32.v          : AXI stream XGMII transmitter (32 bit)
    rtl/axis_xgmii_tx_64.v          : AXI stream XGMII transmitter (64 bit)
    rtl/eth_arb_mux.v               : Ethernet frame arbitrated multiplexer
    rtl/eth_axis_rx.v               : Ethernet frame receiver
    rtl/eth_axis_rx_64.v            : Ethernet frame receiver (64 bit)
    rtl/eth_axis_tx.v               : Ethernet frame transmitter
    rtl/eth_axis_tx_64.v            : Ethernet frame transmitter (64 bit)
    rtl/eth_demux.v                 : Ethernet frame demultiplexer
    rtl/eth_mac_1g.v                : Gigabit Ethernet GMII MAC
    rtl/eth_mac_1g_fifo.v           : Gigabit Ethernet GMII MAC with FIFO
    rtl/eth_mac_1g_gmii.v           : Tri-mode Ethernet GMII/MII MAC
    rtl/eth_mac_1g_gmii_fifo.v      : Tri-mode Ethernet GMII/MII MAC with FIFO
    rtl/eth_mac_1g_rgmii.v          : Tri-mode Ethernet RGMII MAC
    rtl/eth_mac_1g_rgmii_fifo.v     : Tri-mode Ethernet RGMII MAC with FIFO
    rtl/eth_mac_10g.v               : 10G/25G Ethernet XGMII MAC
    rtl/eth_mac_10g_fifo.v          : 10G/25G Ethernet XGMII MAC with FIFO
    rtl/eth_mac_mii.v               : Ethernet MII MAC
    rtl/eth_mac_mii_fifo.v          : Ethernet MII MAC with FIFO
    rtl/eth_mac_phy_10g.v           : 10G/25G Ethernet XGMII MAC/PHY
    rtl/eth_mac_phy_10g_fifo.v      : 10G/25G Ethernet XGMII MAC/PHY with FIFO
    rtl/eth_mac_phy_10g_rx.v        : 10G/25G Ethernet XGMII MAC/PHY RX with FIFO
    rtl/eth_mac_phy_10g_tx.v        : 10G/25G Ethernet XGMII MAC/PHY TX with FIFO
    rtl/eth_mux.v                   : Ethernet frame multiplexer
    rtl/gmii_phy_if.v               : GMII PHY interface
    rtl/iddr.v                      : Generic DDR input register
    rtl/ip.v                        : IPv4 block
    rtl/ip_64.v                     : IPv4 block (64 bit)
    rtl/ip_arb_mux.v                : IP frame arbitrated multiplexer
    rtl/ip_complete.v               : IPv4 stack (IP-ARP integration)
    rtl/ip_complete_64.v            : IPv4 stack (IP-ARP integration) (64 bit)
    rtl/ip_demux.v                  : IP frame demultiplexer
    rtl/ip_eth_rx.v                 : IPv4 frame receiver
    rtl/ip_eth_rx_64.v              : IPv4 frame receiver (64 bit)
    rtl/ip_eth_tx.v                 : IPv4 frame transmitter
    rtl/ip_eth_tx_64.v              : IPv4 frame transmitter (64 bit)
    rtl/ip_mux.v                    : IP frame multiplexer
    rtl/lfsr.v                      : Generic LFSR/CRC module
    rtl/mii_phy_if.v                : MII PHY interface
    rtl/oddr.v                      : Generic DDR output register
    rtl/ptp_clock.v                 : PTP clock
    rtl/ptp_clock_cdc.v             : PTP clock CDC
    rtl/ptp_ts_extract.v            : PTP timestamp extract
    rtl/ptp_perout.v                : PTP period out
    rtl/rgmii_phy_if.v              : RGMII PHY interface
    rtl/ssio_ddr_in.v               : Generic source synchronous IO DDR input module
    rtl/ssio_ddr_in_diff.v          : Generic source synchronous IO DDR differential input module
    rtl/ssio_ddr_out.v              : Generic source synchronous IO DDR output module
    rtl/ssio_ddr_out_diff.v         : Generic source synchronous IO DDR differential output module
    rtl/ssio_sdr_in.v               : Generic source synchronous IO SDR input module
    rtl/ssio_sdr_in_diff.v          : Generic source synchronous IO SDR differential input module
    rtl/ssio_sdr_out.v              : Generic source synchronous IO SDR output module
    rtl/ssio_sdr_out_diff.v         : Generic source synchronous IO SDR differential output module
    rtl/udp.v                       : UDP block
    rtl/udp_64.v                    : UDP block (64 bit)
    rtl/udp_arb_mux.v               : UDP frame arbitrated multiplexer
    rtl/udp_checksum_gen.v          : UDP checksum generator
    rtl/udp_checksum_gen_64.v       : UDP checksum generator (64 bit)
    rtl/udp_complete.v              : UDP stack (IP-ARP-UDP)
    rtl/udp_complete_64.v           : UDP stack (IP-ARP-UDP) (64 bit)
    rtl/udp_demux.v                 : UDP frame demultiplexer
    rtl/udp_ip_rx.v                 : UDP frame receiver
    rtl/udp_ip_rx_64.v              : UDP frame receiver (64 bit)
    rtl/udp_ip_tx.v                 : UDP frame transmitter
    rtl/udp_ip_tx_64.v              : UDP frame transmitter (64 bit)
    rtl/udp_mux.v                   : UDP frame multiplexer
    rtl/xgmii_baser_dec_64.v        : XGMII 10GBASE-R decoder
    rtl/xgmii_baser_enc_64.v        : XGMII 10GBASE-R encoder
    rtl/xgmii_deinterleave.v        : XGMII data/control de-interleaver
    rtl/xgmii_interleave.v          : XGMII data/control interleaver

### AXI Stream Interface Example

transfer with header data

                  __    __    __    __    __    __    __
    clk        __/  \__/  \__/  \__/  \__/  \__/  \__/  \__
               ______________                   ___________
    hdr_ready                \_________________/
                        _____ 
    hdr_valid  ________/     \_____________________________
                        _____
    hdr_data   XXXXXXXXX_HDR_XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
                        ___________ _____ _____
    tdata      XXXXXXXXX_A0________X_A1__X_A2__XXXXXXXXXXXX
                        ___________ _____ _____
    tkeep      XXXXXXXXX_K0________X_K1__X_K2__XXXXXXXXXXXX
                        _______________________
    tvalid     ________/                       \___________
                              _________________
    tready     ______________/                 \___________
                                          _____
    tlast      __________________________/     \___________

    tuser      ____________________________________________


two byte transfer with sink pause after each byte

              __    __    __    __    __    __    __    __    __
    clk    __/  \__/  \__/  \__/  \__/  \__/  \__/  \__/  \__/  \__
                    _____ _________________
    tdata  XXXXXXXXX_D0__X_D1______________XXXXXXXXXXXXXXXXXXXXXXXX
                    _____ _________________
    tkeep  XXXXXXXXX_K0__X_K1______________XXXXXXXXXXXXXXXXXXXXXXXX
                    _______________________
    tvalid ________/                       \_______________________
           ______________             _____             ___________
    tready               \___________/     \___________/
                          _________________
    tlast  ______________/                 \_______________________

    tuser  ________________________________________________________


two back-to-back packets, no pauses

              __    __    __    __    __    __    __    __    __
    clk    __/  \__/  \__/  \__/  \__/  \__/  \__/  \__/  \__/  \__
                    _____ _____ _____ _____ _____ _____
    tdata  XXXXXXXXX_A0__X_A1__X_A2__X_B0__X_B1__X_B2__XXXXXXXXXXXX
                    _____ _____ _____ _____ _____ _____
    tkeep  XXXXXXXXX_K0__X_K1__X_K2__X_K0__X_K1__X_K2__XXXXXXXXXXXX
                    ___________________________________
    tvalid ________/                                   \___________
           ________________________________________________________
    tready
                                _____             _____
    tlast  ____________________/     \___________/     \___________

    tuser  ________________________________________________________


bad frame

              __    __    __    __    __    __
    clk    __/  \__/  \__/  \__/  \__/  \__/  \__
                    _____ _____ _____
    tdata  XXXXXXXXX_A0__X_A1__X_A2__XXXXXXXXXXXX
                    _____ _____ _____
    tkeep  XXXXXXXXX_K0__X_K1__X_K2__XXXXXXXXXXXX
                    _________________
    tvalid ________/                 \___________
           ______________________________________
    tready
                                _____
    tlast  ____________________/     \___________
                                _____
    tuser  ____________________/     \___________


## Testing

Running the included testbenches requires MyHDL and Icarus Verilog.  Make sure
that myhdl.vpi is installed properly for cosimulation to work correctly.  The
testbenches can be run with a Python test runner like nose or py.test, or the
individual test scripts can be run with python directly.

### Testbench Files

    tb/arp_ep.py         : MyHDL ARP frame endpoints
    tb/axis_ep.py        : MyHDL AXI Stream endpoints
    tb/baser_serdes.py   : MyHDL 10GBASE-R SERDES endpoints
    tb/eth_ep.py         : MyHDL Ethernet frame endpoints
    tb/gmii_ep.py        : MyHDL GMII endpoints
    tb/ip_ep.py          : MyHDL IP frame endpoints
    tb/mii_ep.py         : MyHDL MII endpoints
    tb/ptp.py            : MyHDL PTP clock model
    tb/rgmii_ep.py       : MyHDL RGMII endpoints
    tb/udp_ep.py         : MyHDL UDP frame endpoints
    tb/xgmii_ep.py       : MyHDL XGMII endpoints