📄 ez-usb fx2单片机cy7c68013的特性介绍.htm
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<P>注意：只有数据内存空间保留，而程序内存（0xE000－0xFFFF）并不保留。</P>
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<P> 5、端点缓冲区</P>
<P>
FX2包含3个64字节端点缓冲区和4K可配置成不同方式的缓冲，其中3个64字节的缓冲区为EP0、EP1IN和EP1OUT。EP0作为控制端点用，它是一个双向端点，既可为IN也可为OUT。当需要控制传输数据时，FX2固件读写EP0缓冲区，但是8个SETUP字节数据不会出现在这64字节EP0端点缓冲区中。EP1IN和EP1OUT使用独立的64字节缓冲区，FX2固件可配置这些端点为BULK、INTERRUPT或ISOCHRONOUS传输方式，这两个端点和EP0一样只能被固件访问。这一点与大端点缓冲区EP2、EP4、EP6和EP8不同，这四个端点缓冲区主要用来和片上或片外进行高带宽数据传输而无需固件的参与。EP2、EP4、EP6和EP8是高带宽、大缓冲区。它们可被配置成不同的方式来适应带宽的需求。</P>
<P> 6、外部FIFO接口</P>
<P>
EP2、EP4、EP6和EP8大端点缓冲区主要用来进行高速（480Mbits/s）数据传输，可以通过FIFO数据接口与外部ASIC和DSP等处理器无缝连接来实现高速数据传输。它具有通用接口：Slave（从）FIFO（外部主）或GPIF（内部主）、同步或异步时钟、内部或外部时钟等。图3、图4分别为FX2
FIFO处在“Slave FIFO”模式和“GPIF Master”模式。</P>
<P> 7、中断资源</P>
<P>
FX2的中断结构是在一个标准8051单片机的基础上增强和扩展了部分中断资源，中断资源如表1所示：</P>
<P><BR> </P>
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FX2</SPAN><SPAN
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