Semiconductor integrated circuit device for use in a magnetic disk drive with reduced recovery time between operations
AssigneeRohm Co., Ltd.
InventorsMinehisa Yamamoto, Takuya Ishida
Life of this patent
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Abstract
A semiconductor integrated circuit device has a data reproduction circuit for reproducing data read by a head from a magnetic disk during a read operation, a data output circuit for outputting reproduced data obtained as an output of the data reproduction circuit to an external circuit, and an erase current control circuit for controlling an erase current supplied to the head during an erase operation. During an erase operation, the data reproduction circuit is kept deactivated. During transition from an erase operation to a read operation, the data reproduction circuit is activated after the erase current is turned off, and thereafter the data output circuit is activated.
Claims2
A semiconductor integrated circuit device that is used in a magnetic disk drive to write data to, read data from, and erase data from a magnetic disk used as a data storage medium by means of a head, comprising:
- data reproduction means for reproducing data from a signal read by the head from the magnetic disk;
- data output means for outputting reproduced data obtained as an output of the data reproduction means to an external circuit;
- write/erase means for controlling a current supplied to the head when data is written to or erased from the magnetic disk;
- and
- control means for controlling operation of the data reproduction means, the data output means, and the write/erase means,
- wherein, during an erase operation, the control means outputs a control signal which keeps the data reproduction means deactivated, and, during transition from an erase operation to a read operation, the control means first turns off an erase current, and then, a first predetermined length of time thereafter, outputs a control signal which activates the data reproduction means, and then, a second predetermined length of time thereafter, outputs a control signal which activates the data output means.
Dependencies are inferred from the claim text.