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LimeSDR FPGA Gateware
Introduction
Project Structure
Overview
LimeSDR_GW Repository Layout
LimeDFB Repository Layout
Integration Between Repos
Additional Files
Gateware Description
LimeSDR XTRX
Main Block Diagram
Soft core CPU Module
Lime_top Module
LMS7002 Top Module
RX Path Top Module
TX Path Top Module
PCIe PHY Module
I2C Modules
LMS SPI Module
Flash Module
Gateware Register Reference
Documentation for limesdr-xtrx
Modules
Interrupt Controller
Register Groups
UART
ICAP
PCIE_PHY
PCIE_MSI
AUX
PCIE_DMA0
CTRL
GPIO
IDENTIFIER_MEM
LEDS
LIME_TOP
LMS_CLOCK_TEST
MAIN
PCIE_UART0
PCIE_UART1
FLASH
XADC
DNA
I2C0
I2C1
PCIE_ENDPOINT
PERIPHCFG
PPSDO
SPIMASTER
SYS_CLOCK_TEST
TIMER0
CNTRL
VCTCXO_TAMER
Indices and tables
LimeSDR Mini V1
Main Block Diagram
Soft core CPU Module
Lime_top Module
LMS7002 Top Module
RX Path Top Module
TX Path Top Module
FT601 PHY Module
I2C Module
Lms_spi Module
Flash Module
LimeSDR Mini V2
Main Block Diagram
Soft core CPU Module
Lime_top Module
LMS7002 Top Module
RX Path Top Module
TX Path Top Module
FT601 PHY Module
I2C Module
Lms_spi Module
Flash Module
HiperSDR 44xx
Main Block Diagram
Soft core CPU Module
AFE79xx
LimeTop Module
RX Path Top Module
TX Path Top Module
PCIe PHY Module
I2C Modules
SPI Modules
Flash Module
HiperSDR_44xx RF controls
Gateware Register Reference
Documentation for hipersdr-44xx
Modules
Interrupt Controller
Register Groups
UART
PCIE_PHY
PCIE_MSI
AFE
PCIE_DMA0
CTRL
FPGACFG
GPIO_CONTROL
I2C3
IDENTIFIER_MEM
LEDS
LIME_TOP
FLASH
I2C0
I2C1
I2C2
SPIMASTER
SPIMASTER1
PCIE_ENDPOINT
PERIPHCFG
PWR_CONTROL
CNTRL
SPIMASTER_ADF
TIMER0
Indices and tables
Additional features
Compatibility table
UTC timestamping
Primary Code References
System Overview
PPS and UART Plumbing
UTC Extraction and Validity
RX Timestamps and Header Insertion
Software CSR Reference
Quick Setup Checklist
Edge Cases and Notes
Appendix: Header Decode Example
PCIe and USB Interfacing
Overview of Interface Options
USB Interface (FT601)
PCIe Interface (LitePCIe)
Testing and Debugging Interfaces
Toolchains
FPGA Synthesis Toolchains
RISC-V Firmware Toolchains
Gateware Update Mechanism
Overview
Update Process
Multiboot Across FPGAs
Testing and Recovery
Building the Project
Requirements
Cloning the Repository
Build/Load/Flash Instructions
LimeSDR XTRX
Available build options
User/Golden Bitstreams
Programming cables
Flashing Instructions
LimeSDR Mini V1
Available build options
User/Golden Bitstreams
Programming cables
Flashing Instructions
LimeSDR Mini V2
Available build options
User/Golden Bitstreams
Programming cables
Flashing Instructions
HiperSDR 44xx
Available build options
User/Golden Bitstreams
Programming cables
JTAG programming (openFPGALoader)
Used software and hardware
FT2232H Mini Module JTAG adapter
Flashing Instructions
LiteX Basics
Introduction to LiteX in LimeSDR_GW
Overview of LiteX usage in LimeSDR_GW
Benefits of Using LiteX (in the Context of LimeSDR_GW)
Understanding Core LiteX Concepts: Boards, Platforms, Targets
Platform = Board + Constraints
LMS7002M I/O Block on LimeSDR Mini V2
Timing Constraints Generation
Multiple Toolchain Support
Target = SoC Top-Level + Flow Control
How It All Fits Together
Creating LiteX/Migen Wrappers
Example: Wrapping the GPIO Module
General Pattern
Modifying the Project
Gateware
FFT module example
Instantiating FFT Example module
Connecting FFT Example module
Checking FFT results
Firmware
Firmware Loading via UART
Debug Tools
Adding a New Board
Tutorial: Developing New LimeDFB Blocks
Tutorial: Adding a Custom Board
Best Practices and Guidelines
Introduction
File, Module, and Signal Naming Conventions
Module and File Structure
Class Naming
Signal Naming
AXIStream Interfaces
CSRs and Registers
Platform Naming and IO Mapping
Recommendations
Developing for Portability Across Devices and Vendors
Unified Platform and IO Abstraction
Cross-Vendor IO Support: Abstracted Primitives
Cross-Vendor PLL and Clocking
Memory Abstraction and Flexibility
Simplified Toolchain Integration
Avoiding Fragmentation of CPU and Firmware
Soft CPU Core Options
Supported CPUs in LiteX
Tested Cores in LimeSDR_GW
Typical Firmware Workloads
Unified Firmware and Tooling
LimeSDR FPGA Gateware
Gateware Description
LimeSDR XTRX
Documentation for limesdr-xtrx
IDENTIFIER_MEM
Edit on GitHub
IDENTIFIER_MEM
Register Listing for IDENTIFIER_MEM
Register
Address
IDENTIFIER_MEM
0xf0004000
IDENTIFIER_MEM
Address: 0xf0004000 + 0x0 = 0xf0004000
8 x 47-bit memory