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eth_switch

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Verilog Ethernet Switch (layer 2)

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# Verilog Ethernet Switch (layer 2)

## Features:
* Parameterized Number of Ports
* Parameterized MAC-Table (based on dual-port CAM, complexity O(1))
* Flooding and Broadcasting
* CRC Checking
* Static or Dynamic MAC-Table

## Compatible Ethernet Frame
![eth_frame structure](https://raw.githubusercontent.com/mcjtag/eth_switch/master/img/eth_frame.gif)

## Common Ethernet Switch Structure

![eth_switch structure](https://raw.githubusercontent.com/mcjtag/eth_switch/master/img/eth_structure.gif)

## Dual-Port CAM
### Structure

![dpcam structure](https://raw.githubusercontent.com/mcjtag/eth_switch/master/img/dpcam_structure.gif)

Dual-port scheme allows to execute simultaneous request to MAC-Table for SOURCE and DESTINATION ports respectively.

### Mode
#### Static

In this mode MAC-Table do not update itself on the fly. For MAC-Table configuration port s_axis_config_* must be used.

#### Dynamic

In this mode MAC-Table works in 'normal' mode. It dynamically update itself.

## AXIS Interconnect

Arbiter scheduling: Round-Robin

## Parameters
* PORT_NUM        - Number of ports (must be power of '2')
* ADDR_WIDTH      - Address width of MAC-Table
* ETHERNET_MTU    - Ethernet Maximum Transmismission Unit
* FLOODING_ENABLE - Enables (1) or disables (0) Flooding technique
* CRC_CHECK       - Enables (1) or disables (0) CRC Checking (last 4 octets, if presented)
* RAM_STYLE_DATA  - Type of RAM ("block" or "distributed")
* MODE            - Mode of MAC-Table ("dynamic" or "static")

## Ports
* aclk                 - Clock
* aresetn              - Synchronous reset (active-LOW)
* s_axis_tdata         - Input data
* s_axis_tvalid        - Input 'Valid' signal
* s_axis_tready        - Output 'Ready' signal
* s_axis_tlast         - Input 'Last' transfer signal (end of frame)
* m_axis_tdata         - Output data
* m_axis_tvalid        - Output 'Valid' signal
* m_axis_tready        - Input 'Ready' signal
* m_axis_tlast         - Output 'Last' transfer signal (end of frame)
* s_axis_config_tdata  - Input MAC-Table Configuration Data (if MODE == "static")
* s_axis_config_tuser  - Input MAC-Table Configuration 'User' signal (if MODE == "static")
* s_axis_config_tvalid - Input MAC-Table Configuration 'Valid' signal (if MODE == "static")

### Data Format
* s_axis_tdata[8\*1-1-:8]        - Channel #0 Data 
* s_axis_tdata[8\*2-1-:8]        - Channel #1 Data
* ...
* s_axis_tdata[8\*PORT_NUM-1-:8] - Channel #(PORT_NUM-1) Data

### Configuration Data Format
* s_axis_tdata[ADDR_WIDTH-1-:ADDR_WIDTH]                        - Address of CAM cell
* s_axis_tdata[$clog2(PORT_NUM)+ADDR_WIDTH-1-:$clog2(PORT_NUM)] - Port Number (from 0 to PORT_NUM-1)
* s_axis_tdata[48+$clog2(PORT_NUM)+ADDR_WIDTH-1-:48]            - Destination MAC-address

eth_switch

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