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Verilog-PCIexpress Modular Componenets
Modular Verilog PCIexpress Interface Components with complete MyHDL Testbench for FPGA deployment. This repo is a collection of PCI express related components. It Includes a full MyHDL & Verilog testbench with intelligent bus cosimulation endpoints.
PCIe BFM
A MyHDL transaction layer PCI Express bus functional model (BFM) is included in pcie.py. This BFM implements an extensive event driven simulation of a complete PCI express system including :
- root complex switches, devices, and functions
- Includes support for configuration spaces, capabilities and extended capabilities
- Memory and IO operations between devices.
The BFM includes code to
- Enumerate the bus
- Initialize configuration space registers A
- Allocate BARs, route messages between devices
- Perform memory read and write operations
- Allocate DMA accessible memory regions in the root complex
- Handle message signaled interrupts.
Any module can be connected to a cosimulated design, enabling testing of not only isolated components and host-device communication but also communication between multiple components such as device-to-device DMA and message passing.
A MyHDL model of the Xilinx Ultrascale PCIe hard core is included in pcie_us.py. This module can be used in combination with the PCIe BFM to test a MyHDL or Verilog design that targets a Xilinx Ultrascale FPGA. The model currently only supports operation as a device, not as a root port.
| Module | Functional Description |
|---|---|
| Arbiter module | General-purpose parametrizable arbiter. Supports priority and round-robin arbitration. Supports blocking until request release or acknowledge. |
| Axis_arb_mux module | Frame-aware AXI stream arbitrated muliplexer with parametrizable data width and port count. Supports priority and round-robin arbitration |
| Pcie_axi_dma_desc_mux module | Descriptor multiplexer/demultiplexer for PCIe AXI DMA module. Enables sharing the PCIe AXI DMA module between multiple request sources, interleaving requests and distributing responses |
| Pcie_tag_manager module | PCIe in-flight tag manager |
| Pcie_us_axi_dma module | PCIe AXI DMA module for Xilinx Ultrascale series FPGAs. Supports 64, 128, and 256 bit datapaths. Parametrizable AXI burst length. Wrapper for pcie_us_axi_dma_rd and pcie_us_axi_dma_wr |
| Pcie_us_axi_dma_rd module | PCIe AXI DMA module for Xilinx Ultrascale series FPGAs. Supports 64, 128, and 256 bit datapaths. Parametrizable AXI burst length |
| Pcie_us_axi_dma_wr module | PCIe AXI DMA module for Xilinx Ultrascale series FPGAs. Supports 64, 128, and 256 bit datapaths. Parametrizable AXI burst length |
| Pcie_us_axi_master module | PCIe AXI master module for Xilinx Ultrascale series FPGAs. Supports 64, 128, and 256 bit datapaths. Parametrizable AXI burst length. Wrapper for pcie_us_axi_master_rd and pcie_us_axi_master_wr |
| Pcie_us_axi_master_rd module | PCIe AXI master module for Xilinx Ultrascale series FPGAs. Supports 64, 128, and 256 bit datapaths. Parametrizable AXI burst length |
| Pcie_us_axi_master_wr module | PCIe AXI master module for Xilinx Ultrascale series FPGAs. Supports 64, 128, and 256 bit datapaths. Parametrizable AXI burst length |
| Pcie_us_axil_master module | PCIe AXI lite master module for Xilinx Ultrascale series FPGAs. Supports 64, 128, and 256 bit PCIe interfaces |
| Pcie_us_axis_cq_demux module | Demux module for Xilinx Ultrascale CQ interface. Can be used to route incoming requests based on function, BAR, and other fields. Supports 64, 128, and 256 bit datapaths |
| Pcie_us_axis_rc_demux module | Demux module for Xilinx Ultrascale RC interface. Can be used to route incoming completions based on the requester ID (function). Supports 64, 128, and 256 bit datapaths |
| Pcie_us_cfg module | Configuration shim for Xilinx Ultrascale series FPGAs |
| Pcie_us_msi module | MSI shim for Xilinx Ultrascale series FPGAs |
| Priority_encoder module | Parametrizable priority encoder |
| Pulse_merge module | Parametrizable pulse merge module. Combines several single-cycle pulse status signals together |
Source Files
arbiter.v : Parametrizable arbiter
axis_arb_mux.v : Parametrizable AXI stream mux
pcie_axi_dma_desc_mux.v : Descriptor mux for DMA engine
pcie_tag_manager.v : PCIe in-flight tag manager
pcie_us_axi_dma.v : PCIe AXI DMA module with Xilinx Ultrascale interface
pcie_us_axi_dma_rd.v : PCIe AXI DMA read module with Xilinx Ultrascale interface
pcie_us_axi_dma_wr.v : PCIe AXI DMA write module with Xilinx Ultrascale interface
pcie_us_axi_master.v : AXI Master module with Xilinx Ultrascale interface
pcie_us_axi_master_rd.v : AXI Master read module with Xilinx Ultrascale interface
pcie_us_axi_master_wr.v : AXI Master write module with Xilinx Ultrascale interface
pcie_us_axil_master.v : AXI Lite Master module with Xilinx Ultrascale interface
pcie_us_axis_cq_demux.v : Parametrizable AXI stream CQ demux
pcie_us_axis_rc_demux.v : Parametrizable AXI stream RC demux
pcie_us_cfg.v : Configuration shim for Xilinx Ultrascale devices
pcie_us_msi.v : MSI shim for Xilinx Ultrascale devices
priority_encoder.v : Parametrizable priority encoder
pulse_merge : Parametrizable pulse merge module
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/pcie.py : MyHDL PCI Express BFM
tb/pcie_us.py : MyHDL Xilinx Ultrascale PCIe core model