??AXI接口雖然經常使用，很多同學可能并不清楚Vivado里面也集成了AXI的Verification IP，可以當做AXI的master、pass through和slave，本次內容我們看下AXI VIP當作master時如何使用。

??新建Vivado工程，并新建block design，命名為：axi_demo

新建axi vip，參數設置如下，第一個參數設置為Master，其他都保持默認，當然如果可以根據自己的實際需求作改動，比如id位寬，數據位寬等等。

image-20230726185112648

再添加AXI BRAM Controller和Block Memory Generator：

地址分配如下：0xc000_0000

生成ip的各種文件：

新建仿真的tb_top文件，需要注意，文件類型是system verilog。

image-20230726185756796

仿真代碼放到文章末尾，代碼中中導入的axi_demo_axi_vip_0_0_pkg，就是下面axi vip的component_name再加上后綴_pkg，后面的mst_agent也是component_name加上后綴 _mst_t

importaxi_demo_axi_vip_0_0_pkg::*;
axi_demo_axi_vip_0_0_mst_tmst_agent;

運行仿真：

image-20230726190219346

將axi vip的M-AXI添加到波形窗口中：

image-20230726190445127

可以看到，我們一開始向地址0xc0001000寫入0x12345678，又發起一次讀操作，可以將該數據讀出。

image-20230726190702883

有同學可能習慣用vcs來仿真，下篇文章我們再用vcs+verdi來仿真vivado的axi vip。

`timescale1ns/1ps

importaxi_vip_pkg::*;
importaxi_demo_axi_vip_0_0_pkg::*;

moduletb_top();

bitclk;
bitaresetn;

//usedinAPIandparitalrandomizationfortransactiongenerationanddatareadbackfromdriver
axi_transactionwr_transaction;//Writetransaction
axi_transactionrd_transaction;//Readtransaction

xil_axi_uintmtestWID;//WriteID
xil_axi_ulongmtestWADDR;//WriteADDR
xil_axi_len_tmtestWBurstLength;//WriteBurstLength
xil_axi_size_tmtestWDataSize;//WriteSIZE
xil_axi_burst_tmtestWBurstType;//WriteBurstType
xil_axi_uintmtestRID;//ReadID
xil_axi_ulongmtestRADDR;//ReadADDR
xil_axi_len_tmtestRBurstLength;//ReadBurstLength
xil_axi_size_tmtestRDataSize;//ReadSIZE
xil_axi_burst_tmtestRBurstType;//ReadBurstType
xil_axi_lock_tmtestLOCK;//LOCKvalueforWRITE/READ_BURSTtransaction
xil_axi_cache_tmtestCacheType=3;//CacheTypevalueforWRITE/READ_BURSTtransaction
xil_axi_prot_tmtestProtectionType=3'b000;//ProtectionTypevalueforWRITE/READ_BURSTtransaction
xil_axi_region_tmtestRegion=4'b000;//RegionvalueforWRITE/READ_BURSTtransaction
xil_axi_qos_tmtestQOS=4'b000;//QOSvalueforWRITE/READ_BURSTtransaction
xil_axi_data_beatdbeat;//DatabeatvalueforWRITE/READ_BURSTtransaction
xil_axi_user_beatusrbeat;//UserbeatvalueforWRITE/READ_BURSTtransaction
xil_axi_data_beat[255:0]mtestWUSER;//WuservalueforWRITE/READ_BURSTtransaction
xil_axi_data_beatmtestAWUSER='h0;//AwuservalueforWRITE/READ_BURSTtransaction
xil_axi_data_beatmtestARUSER=0;//AruservalueforWRITE/READ_BURSTtransaction
xil_axi_data_beat[255:0]mtestRUSER;//RuservalueforWRITE/READ_BURSTtransaction
xil_axi_uintmtestBUSER=0;//BuservalueforWRITE/READ_BURSTtransaction
xil_axi_resp_tmtestBresp;//BrespvalueforWRITE/READ_BURSTtransaction
xil_axi_resp_t[255:0]mtestRresp;//RrespvalueforWRITE/READ_BURSTtransaction

bit[63:0]mtestWData;//WriteData
bit[8*4096-1:0]Wdatablock;//Writedatablock
xil_axi_data_beatWdatabeat[];//Writedatabeats

bit[63:0]mtestRData;//ReadData
bit[8*4096-1:0]Rdatablock;//Readdatablock
xil_axi_data_beatRdatabeat[];//Readdatabeats


initialbegin
aresetn=1'b0;
clk=1'b0;
#100ns;
aresetn=1'b1;
end

always#10clk<=?~clk;

axi_demo?u_dut(
????.aclk_0???????(clk?????),
????.aresetn_0????(aresetn?)
);

axi_demo_axi_vip_0_0_mst_t??????????????mst_agent;

initial?begin
????mst_agent?=?new("master?vip?agent",u_dut.axi_vip_0.inst.IF);
????mst_agent.start_master();???????????????//?mst_agent?start?to?run
????mtestWID?=?$urandom_range(0,(1<<(0)-1));?
????mtestWADDR?=?'hc000_1000;//$urandom_range(0,(1<<(32)-1));
????mtestWBurstLength?=?0;
????mtestWDataSize?=?xil_axi_size_t'(xil_clog2((32)/8));
????mtestWBurstType?=?XIL_AXI_BURST_TYPE_INCR;
????mtestWData?=?'h12345678;//$urandom();
????$display("mtestWDataSize?=?%d",?mtestWDataSize);
????//single?write?transaction?filled?in?user?inputs?through?API?
????single_write_transaction_api("single?write?with?api",
?????????????????????????????????.id(mtestWID),
?????????????????????????????????.addr(mtestWADDR),
?????????????????????????????????.len(mtestWBurstLength),?
?????????????????????????????????.size(mtestWDataSize),
?????????????????????????????????.burst(mtestWBurstType),
?????????????????????????????????.wuser(mtestWUSER),
?????????????????????????????????.awuser(mtestAWUSER),?
?????????????????????????????????.data(mtestWData)
?????????????????????????????????);
??????????????????????????????????
????mtestRID?=?$urandom_range(0,(1<<(0)-1));
????mtestRADDR?=?mtestWADDR;
????mtestRBurstLength?=?0;
????mtestRDataSize?=?xil_axi_size_t'(xil_clog2((32)/8));?
????mtestRBurstType?=?XIL_AXI_BURST_TYPE_INCR;
????
????$display("mtestRDataSize?=?%d",?mtestRDataSize);
????//single?read?transaction?filled?in?user?inputs?through?API?
????single_read_transaction_api("single?read?with?api",
?????????????????????????????????.id(mtestRID),
?????????????????????????????????.addr(mtestRADDR),
?????????????????????????????????.len(mtestRBurstLength),?
?????????????????????????????????.size(mtestRDataSize),
?????????????????????????????????.burst(mtestRBurstType)
?????????????????????????????????);
end

??task?automatic?single_write_transaction_api?(?
????????????????????????????????input?string?????????????????????name?="single_write",
????????????????????????????????input?xil_axi_uint???????????????id?=0,?
????????????????????????????????input?xil_axi_ulong??????????????addr?=0,
????????????????????????????????input?xil_axi_len_t??????????????len?=0,?
????????????????????????????????input?xil_axi_size_t?????????????size?=xil_axi_size_t'(xil_clog2((32)/8)),
????????????????????????????????input?xil_axi_burst_t????????????burst?=XIL_AXI_BURST_TYPE_INCR,
????????????????????????????????input?xil_axi_lock_t?????????????lock?=?XIL_AXI_ALOCK_NOLOCK,
????????????????????????????????input?xil_axi_cache_t????????????cache?=3,
????????????????????????????????input?xil_axi_prot_t?????????????prot?=0,
????????????????????????????????input?xil_axi_region_t???????????region?=0,
????????????????????????????????input?xil_axi_qos_t??????????????qos?=0,
????????????????????????????????input?xil_axi_data_beat?[255:0]??wuser?=0,?
????????????????????????????????input?xil_axi_data_beat??????????awuser?=0,
????????????????????????????????input?bit?[63:0]??????????????data?=0
????????????????????????????????????????????????);
????axi_transaction???????????????????????????????wr_trans;
????$display("single_write_transaction_api?size?=?%d",?size);
????wr_trans?=?mst_agent.wr_driver.create_transaction(name);
????wr_trans.set_write_cmd(addr,burst,id,len,size);
????wr_trans.set_prot(prot);
????wr_trans.set_lock(lock);
????wr_trans.set_cache(cache);
????wr_trans.set_region(region);
????wr_trans.set_qos(qos);
????wr_trans.set_data_block(data);
????mst_agent.wr_driver.send(wr_trans);???
??endtask??:?single_write_transaction_api?
?
??task?automatic?single_read_transaction_api?(?
????????????????????????????????????input?string?????????????????????name?="single_read",
????????????????????????????????????input?xil_axi_uint???????????????id?=0,?
????????????????????????????????????input?xil_axi_ulong??????????????addr?=0,
????????????????????????????????????input?xil_axi_len_t??????????????len?=0,?
????????????????????????????????????input?xil_axi_size_t?????????????size?=xil_axi_size_t'(xil_clog2((32)/8)),
????????????????????????????????????input?xil_axi_burst_t????????????burst?=XIL_AXI_BURST_TYPE_INCR,
????????????????????????????????????input?xil_axi_lock_t?????????????lock?=XIL_AXI_ALOCK_NOLOCK?,
????????????????????????????????????input?xil_axi_cache_t????????????cache?=3,
????????????????????????????????????input?xil_axi_prot_t?????????????prot?=0,
????????????????????????????????????input?xil_axi_region_t???????????region?=0,
????????????????????????????????????input?xil_axi_qos_t??????????????qos?=0,
????????????????????????????????????input?xil_axi_data_beat??????????aruser?=0
????????????????????????????????????????????????);
????axi_transaction???????????????????????????????rd_trans;
????$display("single_read_transaction_api?size?=?%d",?size);
????rd_trans?=?mst_agent.rd_driver.create_transaction(name);
????rd_trans.set_read_cmd(addr,burst,id,len,size);
????rd_trans.set_prot(prot);
????rd_trans.set_lock(lock);
????rd_trans.set_cache(cache);
????rd_trans.set_region(region);
????rd_trans.set_qos(qos);
????mst_agent.rd_driver.send(rd_trans);???
??endtask??:?single_read_transaction_api

endmodule

責任編輯：彭菁