| 摘要 |
To avoid circular system reset lock out in data processing apparatus of the kind having a system reset capability which includes a system reset function followed after a timed interval by an initial program load procedure for each functional path within the apparatus associated with the reset, which apparatus includes two channels (12, 13) interfacing separately with the control unit (14) of a data storage arrangement (16) in such a way that if one channel is exercising the control unit via its interface (17, 18), the other channel is inhibited from access to the control unit via its interface by a control unit busy signal, detection logic is incorporated in the control unit to detect, for eych interface, that a system reset function is in process via that interface and, for the duration of such detected circumstances to inhibit the effect of system reset caused control unit busy indications in relation to the channels. |
