6es7 972-0ca32-0xa0 隨著微電子技術的迅猛發展，各種芯片在體積不斷縮小的同時，功能卻越來越強大。FPGA芯片也從最初只有幾千門，發展到數百萬門的規模，I／O口由幾十個發展至上千個。在這種資源極其豐富的情況下，FPGA設計者不再滿足于僅僅用其來設計簡單的應用系統，而開始在一片FPGA上集成一個完整的電子系統，即SOPC(System On Progratomble Chip)。
它通常包括片內存儲器和片內微處理器。Altera公司針對其FPGA芯片推出的Nios系列處理器，就是專為SOPC設計而開發的，它是Altera Excalibur嵌入處理器計劃中第一個產品，它成為業界第一款可編程優化的可配置處理器。本文闡述在SOPC中利用Nios處理器實現GDM12864A顯示模塊控制的方法。
1 GDM12864A顯示控制器
GDM12864A是帶顯示存儲器的圖形液晶顯示控制器。它的特點是內置64×64 b的顯示存儲器，顯示屏上各像素點的顯示狀態與顯示存儲器的各位數據一一對應，顯示存儲器的數據直接作為圖形顯示的驅動信號。顯示數據為“1”，相應的像素點顯示；顯示數據為“0”，相應的像素點就不顯示。
同時GDM12864A配備了一套顯示存儲器的管理電路和與計算機接口電路，允許計算機直接訪問顯示存儲器。其具體參數如下：64×64 b(512 B)的顯示存儲器，其數據直接作為顯示驅動信號，8位并行數據接口，64路列驅動輸出，低功耗，在顯示期間功耗為2 mW，較寬的工作電壓，Vcc=2.7～5.5 V，Vee=0～-10 V。
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