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2.1 IC754CGL12CTD硬件規劃
FPGA選用的是Xilinx公司的100萬門FPGA芯片XC3S1000,其配備芯片為Xilinx公司的4 MB容量PROM芯片XCF04S,以主動串行辦法對FPGA進行上電配備。AD、DA分別為ADI公司12位105 MS/s高速模/數改換芯片AD9432與14位105 MS/s高速數/模改換芯片AD9764。SRAM選用Cypress公司的256k×16 bit SRA。
M芯片CY7C1041用於對數據進行大容量緩存,以滿足USB的傳輸需求。USB控制器選用Cypress公司的 EZ-USB FX2係列USB2.0芯片CY7C68013,封裝為PQFP128。它支撐USB2.0高速傳送,高速率可達480 Mb/s。係統框圖如圖2所示。
2.2 IC754CGL12CTD程序規劃
FPGA程序包括雷達信號倣照模塊、雷達信號搜集與傳輸控制模塊和SDK中Microblaze的控制與參數傳遞模塊。雷達信號倣照模塊完成對雷達中頻/視頻和雜波信號的倣照,為雷達的接納係統和信號搜集模塊供應自檢測驗信號。雷達信號搜集與傳輸控制模塊完成對雷達中頻/視頻信號的搜集與傳輸控制,該模塊為係統真實回波的倣照供應了實測數據。參數的傳遞由兩部分組成:上位機的信號參數輸入或信號倣照係統自帶的鍵盤掃描輸入與 Microblaze核之間的參數傳遞;Microblaze將對應的輸入參數通過間斷調用的方式傳遞給信號或雜波發作模塊。在ISE 9.1環境下通過VHDL硬件言語發作脈衝、LFM等信號,運用EDK 9.1的附件將在ISE 9.1中發作的信號模塊轉化為對應的IP核 [8]。在EDK開發中,可以將在ISE中發作的信號倣照的IP核直接添加到工程中,IP核和Microblaze處理器之間通過OPB總線完成信號參數和間斷信號的傳遞,使整個開發進程模塊化。基於FPGA的嵌入式係統規劃的EDK開發中有硬件模塊規劃和軟件控制2個部分,使整個係統兼容了FPGA並行處理的高速率和軟件編程的簡練。
2.3 IC754CGL12CTD驅動程序規劃與運用
FX2的設備驅動程序有2種:一種用來在設備接入時從主機下載固件到RAM中,稱為固件下載驅動程序(wdgtldr.sys);另一種是在設備從頭羅列後加載的通用設備驅動程序(ezusb.sys),應用軟件通過該設備驅動程序與FX2通訊[9]。
固件下載驅動程序(wdgtldr.sys)是運用Cypress公司供應的固件下載驅動程序源代碼和用戶編譯成功的固件代碼,在Win2000 DDK中創建的。在將固件代碼下載到RAM中後,係統根除內存中的固件下載驅動程序,並進行從頭羅列,讓8051固件控制FX2。此刻,係統取得由 8051固件供應的新的ID號,認為有新的USB設備接入,並據此加載相應的通用設備驅動程序。通用設備驅動程序一般不需求從頭編寫,可以直接運用 Cypress公司現已編好的驅動程序ezusb.sys。
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