TABLE
Of
CONTENTS
1.0 SPECIFICATION
SUMMARY..................................
1
1.1
Performance
Specifications..........
. . . . . . . . . . . . . . . . . . . . . . . . . .
..
1
1.1.1
Access Time Definition and Timing 1
1.2
Functional Specifications. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . .
..
1
1.3
Physical Specifications 1
1.4
Reliability
Specifications.....................
. . . . . . . . . . . . . . . . .
..
1
1.4.1
Read Error Rates 1
1.4.1.1
Bit
Jitter............................
. . . . . . . . . . . . . . . . .
..
2
1.4.2
Media Defects 2
1.5
Environmental Specifications 2
1.5.1
Ambient Temperature 2
1.5.2 Temperature Gradient 2
1.5.3
Relative Humidity 2
1.5.4 Altitude Limits 2
1.5.5
Operating
Shock............................................
2
1.5.6 Nonoperating
Shock........................................
2
1.6
DC Power Requirements 3
1.6.1
Input Noise Ripple 3
1.6.2 Input Noise Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
3
1.7
Mounting Requirements 4
1.7.1
Handling and Static-Discharge Precautions. . . . . . . . . . . . . . . . . . .
..
5
2.0
ST212 HOST/DRIVE INTERFACE 6
2.1
Control/Status SignaIs: PCB Edge-Connector JI . . . . . . . . . . . . . . . . .
..
6
2.2
Data
Signals:PCB
Edge-Connector
J2..
. . . . . . . . . . . . . . . . . . . . . . .
..
8
2.3
DC Power: Connector J3
10
2.4 Frame Grounding: Lug
JI0
10
3.0 DRIVE CONFIGURATION
11
3.1
Drive Configuration: Shunt J9 (MLC-Ol)
11
3.2 Drive Select
Il
3.2.1
Daisy-chain
11
3.3
Radial
12
3.4 Write Fault
12
3.5
Life
Test
12
4.0 CONTROL
INPUT
SIGNAIS
13
4.1
Head Select
2°,
2
1
,
2
2
,
2
3
••••••••••••••••••••••••••••••••••••••••
13
4.2 Write Gate
13
4.3
Step
14
4.3.1
Buffered Seek
14
4.3.2 Slow-step (Single-track)
15
4.3.3 Auto-truncation
16
4.4 Direction In
16
4.5
Drive Select
16
S.O
CONTROL OUTPUT SIGNALS 18
5.1
Drive Selected
18
5.2 Index
18
5.3
Track 0
18
5.4 Ready
18
5.5
Seek Complete
19
5.6 Write Fault
19
5.6.1
Write Fault Signal Generation
19
5.6.1.1
Write Current Interruption , 20
5.7
Fault Detection:
PC
Board 20292-XXX 20
5.7.1
Voltage and Head Select Comparator 20
5.7.2 Write Fault Reset 20
5.8
Fault Detection:
PC
Board 20243-XXX
21
5.8.1
Voltage Comparator
~
..
21
5.8.2 Head Select Comparators
21
6.0 READ/WRITE OPERATIONS
.;
22
6.1
Write Operation: PC Board 20292-XXX 22
6.1.1
MFM Write
Data
' 22
Table
of
Contents
iii
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