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82091AA Datasheet(PDF) 16 Page - Intel Corporation |
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82091AA Datasheet(HTML) 16 Page - Intel Corporation |
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16 / 204 page  82091AA 22 Floppy Disk Controller Interface (Continued) Signal Type Description Name FDME1 O FLOPPY DRIVE MOTOR ENABLE 1 IDLE OR DRIVE SELECT ENABLE This signal pin has two functions(1) FDME1 is the motor enable for drive 1 FDME1 DSEN (1) is directly controlled via the Digital Output Register (DOR) and is a function of the mapping based on the BOOTSEL bits in the Tape Drive Register (TDR) The Drive Select Enable (DSEN ) function is only used in a four floppy drive system (see Appendix A FDC Four Drive Support) FDS1 O FLOPPY DRIVE SELECT1 POWERDOWN OR MOTOR DRIVE SELECT 1 This signal pin has two functions(1) FDS1 is the floppy drive select for drive 1 FDS1 MDS1(1) is controlled by the select bits in the DOR and is a function of the mapping based on the BOOTSEL bits in the TDR The Motor Drive Select 1 (MDS1) function is only used in a four floppy drive system (see Appendix A FDC Four Drive Support) FDME0 O FLOPPY DRIVE MOTOR ENABLE 0 OR MOTOR ENABLE ENABLE This signal pin has two functions(1) FDME0 is the motor enable for drive 0 FDME0 is MEEN (1) directly controlled via the Digital Output Register (DOR) and is a function of the mapping based on the BOOTSEL bits in the Tape Drive Register (TDR) The Motor Enable Enable (MEEN ) function is only used in a four floppy drive system (see Appendix A FDC Four Drive Support) FDS0 O FLOPPY DRIVE SELECT 0 OR MOTOR DRIVE SELECT 0 This signal pin has two functions(1) FDS0 is the floppy drive select for drive 0 This output is controlled MDS0(1) by the drive select bits in the DOR and is a function of the mapping based on BOOTSEL bits in the TDR The Motor Drive Select 0 (MDS0) function is only used in a four floppy drive system (see Appendix A FDC Four Drive Support) NOTE 1 The function selected for these pins is based on the FDDQTY bit in the FCFG1 Register as shown in the following table Signal Pin 2 Drive System 4 Drive System (FDDQTYe0) (FDDQTYe1) FDME1 DSEN FDME1 DSEN FDS1 MDS1 FDS1 MDS1 FDME0 MEEN FDME0 MEEN FDS0 MDS0 FDS0 MDS0 When FDDQTYe1 these signal pins are used to control an external decoder for a four floppy disk drive system as described in Appendix A FDC Four Drive Support 16 |
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