Command delivery for a computing system

Details Command delivery for a computing system Command delivery for a computing system

G - Physics

06

F

G06F 13/14 (2006.01)

Patent

CA 2161460

A Command interface includes ports for transferring information between a host processor and at least one intelligent subsystem which may have attached devices. A Command interface port receives either a direct command or an indirect command from the host processor, which commands are indicative of a type of operation to be performed by the one subsystem or an attached device. An Attention port receives a code from the host processor which is indicative of which one of the direct command or the indirect command is received at the Command Interface port, and which is also indicative of which of the one intelligent subsystem or a device is to execute the command. A command busy/status port receives a code from the one intelligent subsystem which is indicative of whether or not the Command Interface port and the Attention port are busy, and whether or not the one intelligent subsystem is accepting or rejecting commands. The host processor can read this port without altering or updating the code.

Une interface de bloc de commande comprend des ports pour le transfert d'informations entre un processeur central et au moins un sous-système intelligent qui peut être muni de dispositifs auxiliaires. Un port d'interface de bloc de commande reçoit une commande directe ou une commande indirecte du processeur central, dont les commandes sont une indication d'un type de fonctionnement devant être effectué par le sous-système ou un dispositif auxiliaire. Un bloc de signalisation reçoit un code du processeur central, qui indique si c'est la commande directe ou la commande indirecte qui est reçue au port d'interface de bloc de commande, et qui indique également si c'est le sous-système intelligent ou un dispositif qui doit exécuter la commande. Un port d'état d'occupation reçoit un code du sous-système intelligent qui indique si le port d'interface de bloc de commande et le port de bloc de signalisation sont occupés ou non, et si le sous-système intelligent accepte ou rejette les commandes ou non. Le processeur central peut lire l'indication du port sans modifier le code ni le mettre à jour.

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