Method of concurrent bus operation for bus controlled devices op

Details Method of concurrent bus operation for bus controlled devices op Method of concurrent bus operation for bus controlled devices op

1997-08-22

2000-03-28

Thai, Xuan M.

Electrical computers and digital data processing systems: input/

Input/output data processing

Concurrent input/output processing and data transfer

710 20, 710 58, 710117, 710124, 713502, G06F 1300

Patent

active

060444134

ABSTRACT:
A solution to the problem of undesired serialization of bus controlled instrument measurement delays for multiple instances of programmatically controlled measurement processes is to configure the bus operations and the control programs to allow the issuance of a command within the context of a first collection of such instruments, without having to wait for the corresponding data before issuing commands within the context of a second collection. This is done by instructing the equipment in the collection to signal that they have data instead of the more customary immediately issued "@ address talk", which is then followed by the delay needed by the equipment to make the measurement. Instead, the "have data" signals are associated with the devices that originated them and then the bus instructions that request the data are issued. In conjunction with this, the usual bus I/O commands in the controlling programs may be replaced with calls to a library that operates in just this fashion. The library also implements another solution suitable for those bus controlled instruments that do not possess the signaling capability. That solution is to simply wait a predefined time after the measurement command is issued before issuing the command to reply with the data. In the interim the bus interface card may be used for other transactions.

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