AXI Protocol Skill
Overview
Expert skill for AMBA AXI protocol implementation and verification, enabling high-performance interconnect design for FPGA systems.
Capabilities
- Implement AXI4, AXI4-Lite, and AXI4-Stream interfaces
- Design AXI masters, slaves, and interconnects
- Handle burst transactions (INCR, WRAP, FIXED)
- Implement proper valid/ready handshaking
- Design AXI address decoding and routing
- Create AXI VIP-based verification
- Optimize AXI performance and throughput
- Generate AXI protocol checkers
Target Processes
- axi-interface-design.js
- ip-core-integration.js
- memory-interface-design.js
- hls-development.js
Usage Guidelines
AXI4 Full Features
- Write address channel (AW), Write data channel (W), Write response (B)
- Read address channel (AR), Read data channel (R)
- Burst types: FIXED, INCR, WRAP
- Burst lengths up to 256 beats
- Out-of-order transaction completion
AXI4-Lite Subset
- Single-beat transactions only
- No burst support
- Simplified for control/status registers
- 32-bit or 64-bit data width
AXI4-Stream
- Continuous data streaming
- TVALID/TREADY handshake
- TLAST for packet boundaries
- TKEEP/TSTRB for byte enables
Handshake Rules
- Source must not wait for READY before asserting VALID
- Once VALID asserted, must remain until READY
- Transfer occurs on clock edge when both VALID and READY high
- Deadlock prevention through proper protocol compliance
Performance Optimization
- Pipeline channels for frequency
- Use write interleaving when supported
- Implement outstanding transaction support
- Size data width for bandwidth requirements
Dependencies
- ARM AMBA AXI specification knowledge
- Protocol checker integration
- VIP awareness for verification