Polling of I/O device status comparison performed in the polled

Details Polling of I/O device status comparison performed in the polled Polling of I/O device status comparison performed in the polled

1992-10-16

1994-06-07

Shaw, Dale M.

Boots, shoes, and leggings

364DIG1, 3642411, 364259, 3642592, 3642597, 364264, 3642641, 3642646, 3642715, 364940, 3649401, G06F 1130

Patent

active

053197852

ABSTRACT:
A method and apparatus for polling a status register selectively delays the returning of status data in the status register. Prior to polling, a match register is loaded via a system bus with a desired status. Status data is presented to the system bus when the status data is the same as the desired status. The features of the invention also permit the masking of selective bits of the status register during the comparison of the status data with the desired status. A mode register selectively inhibits the delayed presentation, and a timer ensures that status data is presented to the system bus within a predetermined interval even if the status data is not the same as the desired status.

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