📄 avalon_tft_lcd.htm
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style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如图</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">2</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示，</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">LCD Controller</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">主要由</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">Avalon </FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">总线接口、寄存器组、控制模块、</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">DMA</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">FIFO</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以及时序生成模块组成。每个寄存器独立编址，处理器可以通过总线读写存储器的方式来访问。处理器通过</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">Avalon</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">总线接读写寄存器，从而完成对</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">LCD</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">控制器工作状态的设定与控制。</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 150%; mso-char-indent-count: 2.0"><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">控制器启动后，</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">DMA Master</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">通过</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">avalon</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">总线读取</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">SDRAM</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中的数据，然后存入</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">FIFO</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中，时序生成模块按照</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">TFT</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时序要求从</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">FIFO</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中读取数据，然后送出去显示。整个数据读取过程不需要处理器干涉，实际上是一个</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">DMA</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">过程。</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><o:p></o:p></SPAN></P>
<P class=MsoNormal
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style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">考虑到</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">DMA</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">读取的速度与</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">TFT</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时序发生器输出的速度不一致（前者大于后者），所以在</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">DMA</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">TFT</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时序发生器之间加入了</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">FIFO</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">用来缓冲数据。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">DMA</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有控制模块控制其工作。控制模块不断检测</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">FIFO</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">状态，当</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">FIFO</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">快满时，暂停</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">DMA</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，当</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">FIFO</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">快空时，重新启动</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">DMA</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，如此循环，可保证</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">FIFO</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不溢出，保证显示画面连续稳定。</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">三、设计细节</SPAN><SPAN
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">1</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">Avalon Bus Slaver</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">从总线接口</SPAN><SPAN
lang=EN-US
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<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 150%; mso-char-indent-count: 2.0"><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">Avalon</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">从总线接口负责处理器与</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">LCD</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">控制器的接口控制，</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">LCD</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">控制器在整个系统中作为从设备，通过该接口，接受</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><FONT
face="Times New Roman">CPU</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的控制。根据设计需要，该接口所需要的各信号为：</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><o:p></o:p></SPAN></P>
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face="Times New Roman">input:<o:p></o:p></FONT></SPAN></P></TD></TR>
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</SPAN>chipselect<o:p></o:p></FONT></SPAN></P></TD>
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style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">片选，高电平有效</SPAN><SPAN
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style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><o:p></o:p></SPAN></P></TD></TR>
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