Arrangement for expanding the device capacity of a bus

G - Physics – 06 – F

Patent

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Details

G06F 13/12 (2006.01) G06F 12/06 (2006.01) G06F 13/14 (2006.01) G06F 13/38 (2006.01) G06F 15/16 (2006.01)

Patent

CA 2119228

An arrangement that allows banks of up to eight duplicated active devices to be connected to a SCSI bus and to share SCSI device IDs, and also allows multiple hosts to share the SCSI bus and the connected active devices. Tri-statebuffers act as gates to interface host adapters of a plurality of hosts, and active devices of a plurality of device banks, to the SCSI bus. The gate of only one host adapter and the gates of only one bank of devices are enabled at any one time. Only the devices of the enabled bank can receive and respond to addresses from the SCSI bus, while the devices of the other banks are prevented from receiving and responding to addresses from the SCSI bus. Each host has a tri-state buffer acting as bank selector for selecting one of the device banks, by enabling the gates of the devices of the selected bank through a bank select bus. Only one host's bank selector is enabled at any one time.

L'invention est un système qui permet de connecter des batteries comportant jusqu'à huit dispositifs actifs identiques à un bus SCSI et de mettre en commun les identificateurs de ces dispositifs, et qui permet à plusieurs hôtes d'utiliser en commun le bus SCSI et les dispositifs actifs connectés. Des tampons à trois états servent de portes pour interfacer au bus SCSI des adaptateurs hôtes faisant partie d'une pluralité et des dispositifs actifs faisant partie d'une pluralité de batteries de dispositifs. € chaque instant ne sont validées que la porte d'un adaptateur hôte et les portes d'une batterie de dispositifs. Les dispositifs de la batterie validée peuvent recevoir des adresses sur le bus SCSI et transmettre des réponses, mais non les dispositifs des autres batteries. Chaque hôte dispose d'un tampon à trois états qui sert de sélecteur de batterie de dispositifs en validant les portes des dispositifs de la batterie sélectionnée par l'intermédiaire d'un bus de sélection de batterie. € un instant quelconque, un seul sélecteur de batterie de l'hôte est validé.

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