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The interface further comprises second electronics 30 adapted to interface parallel data from said parallel data bus 32 into serial data adapted to interface with a second remote bus, said second electronics 30in the absence of a threshold detect signal from the second remote bus, converting said parallel data to said serial data without requiring any signal from said second remote bus. The interface 20 comprises electronics shared by AST CardBus first electronics 26 and the second electronics 30 to interface to the parallel data bus The PCI bus is pervasive in the industry, but as a parallel data bus is not easily bridged AST CardBus other PCI based devices.

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However, separating the laptop computer from the docking station a significant distance has not been possible. Moreover, the processing AST CardBus of computer systems has been resident within the traditional computer used by the user because the microprocessor had to be directly connected to and resident on the PCI motherboard. PCI The PCI bus is primarily a wide multiplexed address and data bus that provides support for everything from a single data word for every address to very long bursts of data words for a single address, with the implication being that burst data is intended for sequential addresses.

Clearly the highest performance of the PCI bus comes from the bursts of data, however most PCI devices require reasonable performance for even the smallest single data word operations. Many PCI devices utilize only the single data mode for their transfers.

In addition, starting with the implementation of the PCI 2. The fundamental reason behind AST CardBus operation of the PCI bus is to enable such things as real time audio and video data streams to be mixed with other operations on the bus without introducing major conflicts or interruption of AST CardBus output.


Imagine spoken words being broken into small unconnected pieces and you get the picture. Prior to PCI 2. Before modification of the spec for version 2. Purists may argue that PCI AST CardBus still theoretically not an isochronous bus, but as in most things in PC engineering, it is close enough.

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Traditional High Speed Serial Typical high speed serial bus operation on the other hand allows the possibility of all sizes of data transfers across the bus like PCI, but it certainly favors the very long bursts of data unlike PCI. The typical operation of a serial bus includes an extensive header of information for every data transaction on the bus much like Ethernet, which requires on the order of 68 bytes of header of information for every data transaction regardless of length. As it turns out Ethernet also requires some guaranteed dead time between operations to"mostly" prevent collisions AST CardBus other Ethernet devices on the widely disperse bus, and that dead time further reduces the average performance. The typical protocol for a serial bus is much the same as Ethernet with often much longer header information. Virtually all existing serial bus protocol implementations are very general and every block of data comes with everything needed to completely identify it.

FiberChannel FC has such a robust protocol that virtually all other serial protocols can be transmitted across FC completely embedded within the FC protocol, sort of like including the complete family history along with object size, physical location within the room, room measurements, room number, street address, city, zip code, country, planet, galaxy, universe, Small transfers across all of these protocols, while possible, are extremely expensive from a bandwidth point of view.


Of course the possibility of isochronous operation on the more general serial bus is not very reasonable. Recreating High Speed Serial for PCI In creating the proprietarySplit-Bridge AST CardBus, Mobility electronics of Phoenix Arizona, the present applicant, actually had to go back to the drawing board and design a far simpler serial protocol to allow a marriage to the PCI bus, because none of the existing implementations could coexist without substantial loss of performance. Split-Bridge technologyfundamentals are a natural for extending anything that exists within a computer.

It basically uses a single-byte of overhead for 32 bits of data and address-actually less when you consider that byte enables, which are not really "overhead", are included as well. Armed with the far simpler protocol, all of the attributes of the PCI bus are preserved and made transparent across a high speed serial link at much higher effective bandwidth than any existing serial protocol. The net result is the liberation of a widely used general purpose bus, and the new found ability to separate what were previously considered fundamental inseparable parts of a computer into separate locations. When the most technical reviewers grasp the magnitude of the invention, then the wheels start to turn and the discussions that follow open up a new wealth of opportunities. It now becomes reasonable to explore some of the old fundamentals, like peer-to-peer communication between computers that has been part of the basic PCI specification from the AST CardBus, but never really feasible because of the physical limits of the bus prior toSplit-Bridge technology.

The simplified single-byte overhead also enables very efficient high speed communication between two computers and could easily be extended beyond PCI. AST CardBus proprietary Split-BridgeTm technology is clearly not "just another high speed link" and distinguishing features that make it different represent novel approaches to solving some long troublesome system architecture issues. First of all is the splitting of a PCI bridge into two separate AST CardBus distinct pieces.

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Conceptually, a PCI bridge was never intended to be resident in two AST CardBus modules or chips and no mechanism existed to allow the sharing of setup information across two separate and distinct devices. A PCI bridge requires a number of programmable registers that supply information to both ports of a typical device. AST Portable "Other" Files cbpdexe, AST CardBus Patch for Ascentia P70/P80,PCMCIA Windows 95 CardBus Patch, Manufacturer: AST. Devices this driver Cirrus Logic PD CardBus Controller Cirrus Logic PD Texas Instruments PCI CardBus Controller.

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