| 摘要 |
PURPOSE:To shorten the access time and to reduce the power consumption in case plural disk drivers are selectively driven by controlling a disk driving motor via a motor control circuit which operates in response to a busy signal and a drive control signal. CONSTITUTION:A high level busy signal LU passed through NOT circuits 13a, 13b... is applied to data terminals D of D type FFs 15a, 15b... of motor control circuits 11a, 11b... of disk drivers 1, 2. Then high level drive control signals L1, L2... passed through NOT circuits 14a, 14b... are applied to clock terminals C of the FFs 15a, 15b... of drivers 1 and 2 selected under the above-mentioned state. As a result, the Q' outputs of the FFs 15a, 15b... are inverted to low levels, and driving motors M1 and M2 are revolved via NOR circuits 12a, 12b.... These Q' outputs are kept at high levels even after the signals L1, L2... are erased and then reset to low levels in response to erasion of the signal LU. As a result, the drive control corresponding to selection is carried out in a short time. Thus plural disk drivers are selectively driven in a short access time and with low power consumption.
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