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VT8231 Datasheet(PDF) 24 Page - List of Unclassifed Manufacturers

Part # VT8231
Description  SOUTH BRIDGE PC99 COMPLIANT
PDF  132 Pages
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Manufacturer  ETC [List of Unclassifed Manufacturers]
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VT8231 Datasheet(HTML) 24 Page - List of Unclassifed Manufacturers

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VT8231
Preliminary Revision 0.8 October 29, 1999
-18-
Pinouts
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Floppy Disk Interface
Signal Name
Pin #
I/O
Signal Description
DRVDEN0
L17
OD
Drive Density Select 0.
DRVDEN1
K17
OD
Drive Density Select 1.
MTR0#
K18
OD
Motor Control 0. Select motor on drive 0.
MTR1#
J16
OD
Motor Control 1. Select motor on drive 1
DS0#
J17
OD
Drive Select 0. Select drive 0.
DS1#
K19
OD
Drive Select 1. Select drive 1
DIR#
K20
OD
Direction. Direction of head movement (0 = inward motion, 1 = outward motion)
STEP#
J18
OD
Step. Low pulse for each track-to-track movement of the head.
INDEX#
L20
I
Index. Sense to detect that the head is positioned over the beginning of a track
HDSEL#
H19
OD
Head Select. Selects the side for R/W operations (0 = side 1, 1 = side 0)
TRK00#
H16
I
Track 0. Sense to detect that the head is positioned over track 0.
RDATA#
H20
I
Read Data. Raw serial bit stream from the drive for read operatrions.
WDATA#
J19
OD
Write Data. Encoded data to the drive for write operations.
WGATE#
J20
OD
Write Gate. Signal to the drive to enable current flow in the write head.
DSKCHG#
H18
I
Disk Change.
Sense that the drive door is open or the diskette has been changed
since the last drive selection.
WRTPRT#
H17
I
Write Protect. Sense for detection that the diskette is write protected (causes write
commands to be ignored)
See also Parallel Port pin descriptions for optional Floppy Disk interface functionality



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