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https://github.com/alexforencich/verilog-wishbone

Verilog wishbone components
https://github.com/alexforencich/verilog-wishbone

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Verilog wishbone components

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README 

        
# Verilog Wishbone Components Readme



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



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



## Introduction



Collection of Wishbone bus components.  Most components are fully

parametrizable in interface widths.  Includes full MyHDL testbench with

intelligent bus cosimulation endpoints.



## Documentation



### arbiter module



General-purpose parametrizable arbiter.  Supports priority and round-robin

arbitration.  Supports blocking until request release or acknowledge. 



### axis_wb_master module



AXI Stream Wishbone master.  Intended to be used to bridge a streaming

or packet-based protocol (serial, ethernet, etc.) to a Wishbone bus.



### priority_encoder module



Parametrizable priority encoder.



### wb_adapter module



Width adapter module to bridge wishbone buses of differing widths.  The module

is parametrizable, but their are certain restrictions.  First, the bus word

widths must be identical (same data bus width per select line).  Second, the

bus widths must be related by an integer multiple (e.g. 2 words and 6 words,

but not 4 words and 6 words).



### wb_arbiter_N module



Parametrizable arbiter module to enable sharing between multiple masters.



Can be generated with arbitrary port counts with wb_arbiter.py.



### wb_async_reg module



Asynchronous register module for clock domain crossing with parametrizable

data and address interface widths.  Uses internal synchronization to pass

wishbone bus cycles across clock domain boundaries.



### wb_dp_ram module



Dual-port, dual-clock RAM with parametrizable data and address interface

widths.



### wb_mux_N module



Wishbone multiplexer with parametrizable data and address interface widths.



Can be generated with arbitrary port counts with wb_mux.py.



### wb_ram module



RAM with parametrizable data and address interface widths.



### wb_reg module



Synchronous register with parametrizable data and address interface widths.

Registers all wishbone signals.  Used to improve timing for long routes.



### Source Files



    arbiter.v                   : General-purpose parametrizable arbiter

    axis_wb_master.v            : AXI Stream Wishbone master

    priority_encoder.v          : Parametrizable priority encoder

    wb_adapter.v                : Parametrizable bus width adapter

    wb_arbiter.py               : Arbiter generator

    wb_arbiter_2.py             : 2 port WB arbiter

    wb_async_reg.v              : Asynchronous register

    wb_dp_ram.v                 : Dual port RAM

    wb_mux.py                   : WB mux generator

    wb_mux_2.v                  : 2 port WB mux

    wb_ram.v                    : Single port RAM

    wb_reg.v                    : Register



## 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/axis_ep.py           : MyHDL AXI Stream endpoints

    tb/wb.py                : MyHDL Wishbone master model and RAM model