ABB示教器电缆线 3HAC031683-001
报价单位:厦门航拓电气有限公司
联系人:戴先生
手机:18006003561(微信同号)
座机:0592-5072089
***:565167042
PCI总线标准所定义的信号线通常分成!需的和可选的两大类。其信号线总数为120条(包括电源、地、保留引脚等)。其中,!需信号线:主控设备49条,目标设备47条。可选信号线:51条(主要用于64位扩展、中断请求、高速缓存支持等)。主设备是指取得了总线控制权的设备,而被主设备选中以进行数据交换的设备称为从设备或目标设备。作为主设备需要49条信号线,若作为目标设备,则需要47条信号线,可选的信号线有51条。利用这些信号线便可以传输数据、地址,实现接口控制、仲裁及系统的功能。PCI局部总线信号如下所示。下面按功能分组进行说明:
1)系统信号CLK IN:系统时钟信号,为所有PCI传输提供时序,对于所有的PCI设备都是输入信号。其频率!高可达33MHz/66MHz,这一频率也称为PCI的工作频率。 RST# IN:复位信号。用来迫使所有PCI专用的寄存器、定序器和信号转为初始状态。
2).地址和数据信号 AD[31::00]T/S:地址、数据复用的信号。PCI总线上地址和数据的传输,!需在FRAME#有效期间进行。当FRAME#有效时的第1个时钟,AD[31::00]上的信号为地址信号,称地址期;当IRDY#和TRDY#同时有效时,AD[31::00]上的信号为数据信号,称数据期。一个PCI总线传输周期包含一个地址期和接着的一个或多个数据期。 C/BE[3::0]# T/S:总线命令和字节允许复用信号。在地址期,这4条线上传输的时总线命令;在数据期,它们传输的时字节允许信号,用来..在数据期,AD[31::00]线上4个数据字节中哪些字节为有效数据,以进行传输。 PAR T/S:奇偶校验信号。它通过AD[31::00]和C/BE[3::0]进行奇偶校验。主设备为地址周期和写数据周期驱动PAR,从设备为读数据周期驱动PAR。
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