CardBus, the 32-bit high performance bus mastering architecture for PC Cards, was standardized by the PCMCIA in May 1996. It was conceived as a means to add high bandwidth capabilities to the PC Card technology and to match the system performance achieved by today's PCI bus-based mobile computers.
This paper describes the role that CardBus fills as an add-in mechanism for mobile computing platforms. It outlines the benefits of CardBus and relates CardBus to other bus technologies including the following:
Universal Serial Bus (USB)
IEEE 1394 high-speed serial bus (herein referred to simply as "1394").
Hot Pluggable PCI
Small Form Factor PCI
Zoomed Video
16-bit PC Card technology
CardBus has a secure position as today's preferred high-speed mobile interconnect bus. CardBus can and does peacefully co-exist in the mobile computing environment and has several distinct benefits in portable computing design. These advantages include the following:
100% PC Card socket penetration on notebook computers
Hot pluggability support
Power Management support
Well defined and architected firmware and software solution
Targeted to mobile environment
Several current trends in mobile-platform architecture are taking place which may affect the role of CardBus in future portable computing systems. The PCMCIA is dedicated to the advancement of PC Card architecture to keep up with the demands of mobile computer users for higher performance, longer battery life, and ease of use.
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