Command delivery for a computing system

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

G - Physics

06

F

354/233

G06F 13/14 (2006.01) G06F 13/12 (2006.01)

Patent

CA 2012400

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.

L'invention est une interface de commande qui est dotée de ports servant à transmettre des informations entre un processeur hôte et au moins un sous-système intelligent auquel des dispositifs peuvent être connectés. Un port d'interface de commande reçoit une instruction directe ou une instruction indirecte du processeur hôte, ces instructions indiquant le type de l'opération à effectuer par le sous-système ou l'un des dispositifs qui lui est connecté. Un port de signalisation reçoit un code du processeur hôte, ce code indiquant si l'instruction reçue au port d'interface de commande est une instruction directe ou une instruction indirecte, et si cette instruction doit être exécutée par le sous-système intelligent ou l'un des dispositifs qui lui est connecté. Un port de situation reçoit un code du sous-système intelligent, ce code indiquant si le port d'interface de commande et le port de signalisation sont occupés, ainsi que si le système intelligent accepte ou non de recevoir des instructions. Le processeur hôte peut prendre connaissance de l'information fournie à ce port sans modifier le code ou le mettre à jour.

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