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VT82C686B
Revision 1.71 June 9, 2000
-15-
Pinouts
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Floppy Disk Interface
Signal Name
Pin #
I/O
Signal Description
DRVDEN0
D9
O
Drive Density Select 0.
DRVDEN1
D6
O
Drive Density Select 1.
MTR0#
E9
O
Motor Control 0. Select motor on drive 0.
MTR1#
C8
O
Motor Control 1. Select motor on drive 1
DS0#
B8
O
Drive Select 0. Select drive 0.
DS1#
A8
O
Drive Select 1. Select drive 1
DIR#
D8
O
Direction. Direction of head movement (0 = inward motion, 1 = outward motion)
STEP#
E8
O
Step. Low pulse for each track-to-track movement of the head.
INDEX#
D7
I
Index. Sense to detect that the head is positioned over the beginning of a track
HDSEL#
C7
O
Head Select. Selects the side for R/W operations (0 = side 1, 1 = side 0)
TRK00#
E7
I
Track 0. Sense to detect that the head is positioned over track 0.
RDATA#
B6
I
Read Data. Raw serial bit stream from the drive for read operatrions.
WDATA#
A7
O
Write Data. Encoded data to the drive for write operations.
WGATE#
B7
O
Write Gate. Signal to the drive to enable current flow in the write head.
DSKCHG#
C6
I
Disk Change.
Sense that the drive door is open or the diskette has been changed
since the last drive selection.
WRTPRT#
A6
I
Write Protect. Sense for detection that the diskette is write protected (causes write
commands to be ignored)
FDCIRQ / DACK2#
/ USBOC0# / GPO25
G5
I
FDC Interrupt Request. Rx75[2] = 0.
FDCDRQ / DRQ2
/ USBOC1# / GPO24
/ SERIRQ
H3
I
FDC DMA Request. Rx75[3] = 1.
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