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82091AA Datasheet, PDF (16/204 Pages) Intel Corporation – ADVANCED INTEGRATED PERIPHERAL (AIP)
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82091AA
2 2 Floppy Disk Controller Interface (Continued)
Signal
Name
Type
Description
FDME1
O FLOPPY DRIVE MOTOR ENABLE 1 IDLE OR DRIVE SELECT ENABLE This
DSEN (1)
signal pin has two functions(1) FDME1 is the motor enable for drive 1 FDME1
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
MDS1(1)
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
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
MEEN (1)
pin has two functions(1) FDME0 is the motor enable for drive 0 FDME0 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 Motor Enable Enable (MEEN ) function is only used in a four floppy drive
system (see Appendix A FDC Four Drive Support)
FDS0
MDS0(1)
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
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
(FDDQTYe0)
4 Drive System
(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
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