Data transfer operations between two asynchronous buses

Details Data transfer operations between two asynchronous buses Data transfer operations between two asynchronous buses

G - Physics

06

F

354/232

G06F 13/14 (2006.01) G06F 13/16 (2006.01) G06F 13/20 (2006.01) G06F 13/36 (2006.01) G06F 13/40 (2006.01)

Patent

CA 2007737

A technique for permitting data transfers between a high speed bus and a low speed bus which operate independently and asynchronously wherein when the low speed bus requires access to the high speed bus, the busy status of the latter bus is determined and transfers are made to the high speed bus at high speed when such bus is not busy. When the high speed bus requires access to the low speed bus, if the low speed bus is busy the requesting master on the high speed bus is temporarily placed in a pending status and is removed from its tenure on the high speed bus, so that the high speed bus is free to handle other requests. When the low speed bus is free, the highest priority pending requestor is provided access to the low speed bus on a priority basis over all then current requestors.

Technique permettant de réaliser des transferts de données entre un bus rapide et un bus lent fonctionnant indépendamment l'un de l'autre et de manière asynchrone. D'après cette technique, lorsque le bus lent demande à avoir accès au bus rapide, on détermine d'abord si ce dernier est ou non occupé, et l'on effectue les transferts vers le bus rapide à grande vitesse lorsqu'il ne l'est plus. Lorsque le bus rapide demande à avoir accès au bus lent et que ce dernier est occupé, on place temporairement l'unité maîtresse du bus rapide faisant la demande en état d'attente, tout en le libérant de l'exécution de sa tâche sur le bus rapide, pour permettre au bus rapide de traiter d'autres demandes. Lorsque le bus lent se libère, le demandeur en attente ayant la priorité la plus élevée obtient l'accès du bus lent si, effectivement, il a priorité sur tous les autres demandeurs en attente.

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