VT82C686B

Manufacturer Part NumberVT82C686B
ManufacturerETC-unknow
VT82C686B datasheet
 


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Page 21/128:

Floppy Disk Interface

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Signal Name
Pin #
DRVDEN0
D9
D6
DRVDEN1
E9
MTR0#
MTR1#
C8
DS0#
B8
DS1#
A8
DIR#
D8
STEP#
E8
D7
INDEX#
C7
HDSEL#
TRK00#
E7
RDATA#
B6
A7
WDATA#
B7
WGATE#
DSKCHG#
C6
WRTPRT#
A6
FDCIRQ / DACK2#
G5
/ USBOC0# / GPO25
FDCDRQ / DRQ2
H3
/ USBOC1# / GPO24
/ SERIRQ
Revision 1.71 June 9, 2000

Floppy Disk Interface

I/O
Signal Description
O
Drive Density Select 0.
O
Drive Density Select 1.
O
Motor Control 0. Select motor on drive 0.
O
Motor Control 1. Select motor on drive 1
O
Drive Select 0. Select drive 0.
O
Drive Select 1. Select drive 1
O
Direction. Direction of head movement (0 = inward motion, 1 = outward motion)
O
Step. Low pulse for each track-to-track movement of the head.
I
Index. Sense to detect that the head is positioned over the beginning of a track
O
Head Select. Selects the side for R/W operations (0 = side 1, 1 = side 0)
I
Track 0. Sense to detect that the head is positioned over track 0.
I
Read Data. Raw serial bit stream from the drive for read operatrions.
O
Write Data. Encoded data to the drive for write operations.
O
Write Gate. Signal to the drive to enable current flow in the write head.
I
Disk Change.
Sense that the drive door is open or the diskette has been changed
since the last drive selection.
I
Write Protect. Sense for detection that the diskette is write protected (causes write
commands to be ignored)
I
FDC Interrupt Request. Rx75[2] = 0.
I
FDC DMA Request. Rx75[3] = 1.
-15-
VT82C686B
Pinouts