Description and usage of Axi interconnect IP core

AXI interconnect Introduce

        AXI interconnect It can be done to AXI Bus for management , Support multiple hosts to adopt AXI Bus access slave , Or one host accesses multiple slaves . Bus communication is really realized ,N Master Module and M Slave Module communication , Reduce the complexity of communication between each other , Internal clock domain conversion , There is no need for excessive external intervention , Internally realizable FIFO etc. , It eliminates the need for FIFO,Register, Bit width conversion , The need for protocol conversion .

         The IP Nuclear power can support at most 16 A master device 、16 Slave devices , If you need more interfaces , You can add a few more IP nucleus , Usually it's time to IP Nuclear in Block Design There are a lot of them , Here's a brief introduction Block Design In the middle of the day . stay Block Design Is usually simplified IP Usage of nucleus , But it can be wired automatically . about AXI This kind of signal has more signals , stay Block Design It is also more convenient .

1、 A single host accesses multiple slaves

         The principle that a single host accesses multiple slaves is adopted as slaves AXI The bus assigns different addresses , In this way, the host accesses different slaves by accessing different address partitions .

         As shown below ： use AXI interconnect Connect two BRAM controller , For connection BRAM Controller AXI Bus allocation address space , Two were assigned 4K Address space of , Connect to the host AXI The bus can access different address spaces to access different BRAM Read and write data .

         Simulate it , The two one. BRAM The occupied address space is continuously written , Read continuously after writing . You can see that one master controls two slaves .

2、 Multiple hosts access multiple slaves

Multiple hosts read and write one slave through the host ID The number is different , Each host has different ID Number , When reading and writing internally, the address will add this host number , On behalf of which host , The returned data is transmitted to the corresponding host .

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         As shown below ： The two hosts use AXI interconnect Connect two BRAM controller , Two slaves have different address spaces , The two hosts have different ID Number , In this way, different hosts can access different slaves .

When the master accesses the slave at the same time , You can also set the priority of the host to determine which host has input access ,

  If relative to this IP Nuclear for a deeper understanding , You can refer to XILNX It's official product Guide.AXI interconnect official product Guidehttps://docs.xilinx.com/r/en-US/pg059-axi-interconnect/AXI-Interconnect-v2.1-LogiCORE-IP-Product-Guide