Pin No. Signal name I/O Signal Description
1 GND
Power Ground
2 +5V
Power Supply
3 GND
Power Ground
4 GND
Power Ground
5 N.C
6 DR0 O Drive Select 0. Select drive 0.
7 MTR0 O Motor Control 0
8 DIR O Direction. Direction of head movement (0 =
inward motion, 1 = outward motion)
9 WDATA O Write Data. Encoded data to the drive for write
operations.
10 GND
Power Ground
11 DRVDEN0 O Drive density select 0
12 RDATA I Read Data. Raw serial bit stream from the
drive for read operations.
13 N.C
14 N.C
15 N.C
16 N.C
17 INDEX I Index. Sense to detect that the head is
positioned over the beginning of a track
18 N.C
19 N.C
20 GND
Power Ground
21 STEP O Step. Low pulse for each track-to-track
movement of the head.
22 WGATE O Write Gate. Signal to the drive to enable
current flow in the write head.
23 TRK0 I Track 0. Sense to detect that the head is
positioned over track 0.
24 WRTPROT I Write Protect. Sense for detection that the
SurePOS 500 Model XX3 Technical Reference, v 1.3 Page 53 of
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