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公开(公告)号:CA2161460C
公开(公告)日:1999-05-11
申请号:CA2161460
申请日:1990-03-16
Applicant: IBM
Inventor: BENEVENTO FRANCIS MICHAEL , CHILSHOLM DOUGLAS RODERICK , MANDESE ERNEST NELSON , MCNEILL ANDREW BOYCE , MENDELSON RICHARD NEIL , DODDS SAMMY DAVIS , DESAI DHRUVKUMAR M
IPC: G06F13/14
Abstract: 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.
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公开(公告)号:CA2161460A1
公开(公告)日:1990-12-10
申请号:CA2161460
申请日:1990-03-16
Applicant: IBM
Inventor: BENEVENTO FRANCIS MICHAEL , CHILSHOLM DOUGLAS RODERICK , DODDS SAMMY DAVIS , DESAI DHRUVKUMAR M , MANDESE ERNEST NELSON , MCNEILL ANDREW BOYCE , MENDELSON RICHARD NEIL
IPC: G06F13/14
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