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最新版本的PCMCIA标准(现在叫做PC卡标准)定义为一种PC卡的高性能32位总线主控接口,即CardBus.尽管CardBus保持同以往PCMCIA接口一定程度的后向兼容性,但是,CardBus将潜在的吞吐量从20MBps提高到理论上最高的132MBps.此外,总线主控能力还降低了主CPU同外设接口所需的开销.PC卡标准一开始只支持存储器接口.下一个版本增加了对I/O接口的支持.一种使用这两种接口之一的PC卡叫做16位PC卡,即用于主CPU和PC卡之间的通信的16位数据通道.当16位PC卡插入PC卡插座时,最初的接口是仅存储器接口.如果PC卡需要I/O和存储器接口,客户机软件就配置卡和插座.
The latest version of the PCMCIA standard (now called the PC Card standard) is defined as a high-performance 32-bit bus master interface for a PC Card called the CardBus. Although CardBus maintains a degree of backward compatibility with previous PCMCIA interfaces, CardBus Potential throughput increases from 20MBps to theoretically the highest 132MBps. In addition, bus mastering also reduces the main CPU with the peripheral interface overhead required .PC card standard initially supports only the memory interface. The next version adds I / O Interface Support. A PC card that uses one of these two interfaces is called a 16-bit PC card, a 16-bit data channel used for communication between the host CPU and a PC card. When a 16-bit PC card is inserted into the PC Card socket, the initial interface is the memory only interface, and if the PC card requires I / O and memory interfaces, the client software configures the card and socket.