axi_xbar integration issue
#1
I am encountering an issue while using an AXI crossbar in my project, which has 2 slave ports and 1 master port. In the project, I have two DMAs accessing a single memory for read operations. I am using the PULP AXI_XBAR, and although it simulates, I am experiencing an error where the crossbar directs all request response data to one DMA. It correctly decodes read addresses from both DMAs but sends the response data to only one DMA. Can anyone guide me on this issue? Here is the crossbar configuration:
// AXI Configuration
localparam axi_pkg::xbar_cfg_t XbarCfg = '{
    NoSlvPorts: 2,
    NoMstPorts: 1,
    MaxMstTrans: 20,
    MaxSlvTrans: 10,
    FallThrough: 1'b0,
    LatencyMode: axi_pkg::CUT_ALL_AX,
    PipelineStages: 2,
    AxiIdWidthSlvPorts: 2,
    AxiIdUsedSlvPorts: 2,
    UniqueIds: 1'b0,
    AxiAddrWidth: AddrWidth,
    AxiDataWidth: DataWidth,
    NoAddrRules: 1
};
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#2
(07-12-2024, 05:46 PM)malik775 Wrote: I am encountering an issue while using an AXI crossbar in my project, which has 2 slave ports and 1 master port. In the project, I have two DMAs accessing a single memory for read operations. I am using the PULP AXI_XBAR, and although it simulates, I am experiencing an error where the crossbar directs all request response data to one DMA. It correctly decodes read addresses from both DMAs but sends the response data to only one DMA. Can anyone guide me on this issue? Here is the crossbar configuration:
// AXI Configuration
localparam axi_pkg::xbar_cfg_t XbarCfg = '{
    NoSlvPorts: 2,
    NoMstPorts: 1,
    MaxMstTrans: 20,
    MaxSlvTrans: 10,
    FallThrough: 1'b0,
    LatencyMode: axi_pkg::CUT_ALL_AX,
    PipelineStages: 2,
    AxiIdWidthSlvPorts: 2,
    AxiIdUsedSlvPorts: 2,
    UniqueIds: 1'b0,
    AxiAddrWidth: AddrWidth,
    AxiDataWidth: DataWidth,
    NoAddrRules: 1
};

Wrongly routed responses are usually caused by id mismatches on the subordinate side (request and response IDs do not match). Does the crossbar print any warnings or errors during the simulation? I cannot provide you with more assistance at this point without more information from your side. If you think this behavior is a bug in the code of the crossbar, we would highly appreciate it if you could open an issue on the corresponding GitHub page.
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