Table Of Contents - Seagate ST212 Product Manual

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
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