Method to Provide Low Power Standby Mode for Online Devices
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
A method is described to reduce the standby power required by online devices, thus allowing a smaller power supply to be used. The power requirements of I/O devices (internal or external to the system unit) can be reduced by creating a standby mode of operation. This standby mode is entered and exited by issuing a predetermined control signal sequence (or the lack of control signal sequences) specific to the particular device. The standby mode can also be the default mode. An example of this is the typical 8", 5 1/4", and 3.5" floppy disk drives (FDDs). In the case of the FDD, and interface signal selects the drive to perform some type of operation. Another interface signal instructs the drive to start or stop the spindle motor. For the drive to perform any operation one or both signals must be active.