Text preview for : SY31-0458-3_Section_13_62PC_Disk.pdf part of IBM SY31-0458-3 Section 13 62PC Disk IBM system34 fe SY31-0458-3_System_34_5340_System_Unit_Theory_Diagrams_Manual_Jul79 SY31-0458-3_Section_13_62PC_Disk.pdf



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Contents
62PC DISK DRIVE AND ATTACHMENT . . 13-1 Diagnostic Operations. . . . . . . 13-19 Control Storage Initial Program Load. . 13-56
INTRODUCTION 13-1 Load Seek Required Address Direct 13-19 Common Adapter Initiation Program
62PC Disk Drive . 13-1 Load Seek Control Direct 13-19 Load Operation 13-56
Grounding . . 13-1 Sense File Direct . . . . . . . . 13-19 Command Bus In . . . . . . . 13-58
Subframe 13-1 Sense File Diagnostic Sense Bytes COMMANDS . . . . . . . . . 13-60
Disk Enclosure and Spindle Brake . 13-1 1, 2, and 3 . . . . . . . . . . 13-19 I/O Load Command-I/O Control
Actuator Lock 13-1 Sense File Diagnostic Sense Bytes Load Command 13-60
Drive Motor Assembly 13-1 1, 2, and 3 256 Sample Test 13-19 I/O Sense Command-I/O Control
Attachment . . . 13-1 Sense File Diagnostic Wrap 13-19 Sense Command . . . . . . . 13-62
Circuit Locations . 13-2 Disk Speed Timing Diagnostic 13-19 Sense Interrupt Level Status Byte
DISK FORMAT 13-3 Timed Seek Diagnostic 13-19 Command . . . . . . . . . . 13-63
Cylinders . . . 13-3 Read Data with Data Repeat . 13-19 Jump on I/O Condition Command. 13-64
Tracks . . . . 13-3 Read Common Adapter Buffer Storage 13-19 Common Adapter Commands . . . 13-65
Servo Track 13-3 Common Adapter File Control Block . . . 13-20 Common Adapter Command Descriptions 13-69
Data Track . 13-3 Loading and Sensing the Common Adapter ERROR CONDITIONS . . . . 13-70
Guard Band 13-3 File Control Block. . . . . . . . . 13-24 Channel Adapter Sensed Errors . 13-71
Landing Zone. 13-3 Loading the Common Adapter File Disk Drive Sensed Errors . . . . 13-72
Sectors . . . . . 13-4 Control Block . . . . . . . . . 13-24 Common Adapter Sensed Errors 13-73
Data Recording . 13-6 Sensing the Common Adapter File INPUT/OUTPUT LINES 13-78
Reading and Writing Data 13-6 Control Block . . . 13-24 Lines Between the Channel and the Channel
DATA PROTECTION . . 13-7 Interrupts . . . . . . . . . . . . . 13-28 Adapter . . . . . . . . . . . . . . . . 13-79
Data Unsafe Conditions 13-7 Burst Mode Cycle Steal . . . . . . 13-30 Lines Between the Channel Adapter and the
Not Ready . . . . . . 13-7 Servo Tracks and Servo Track Follow 13-34 Common Adapter. . . . . . . . . . 13-80
Power On and Power Off. 13-7 Access Locating 13-34 CA Data Bus (18 Lines, Bidirectional) . . 13-80
DATA FLOW . . . . . . 13-8 Dedicated Servo 13-34 Tag Bus (9 Lines) . . . . . . . . . . . 13-80
System I/O Channel Interface . 13-10 Track Follow Waveshapes 13-38 Lines Between the Common Adapter and the
Common Adapter Interface 13-10 Sample Servo . . . . . 13-39 62PC Disk Drive . 13-80
State Counter. 13-10 Sample Servo Waveshapes 13-40 Dedicated Cable 13-80
Controller 13-10 Access Operations. . . . . 13-42 Bus Cable . . . 13-81
Buffer Storage 13-10 Starting the Operation . . 13-42
Oscillator and Clocks 13-10 Performing the Operation 13-44
Disk Drive Interface 13-11 Seek Calibration Sequence 13-44
Write Data Flow . 13-11 Seek Waveshapes 13-46
Read Data Flow . . 13-11 Reading and Writing Data 13-47
OPERATIONS . . . 13-12 Head Selection 13-47
Operation Sequence 13-12 Writing Data . . . 13-48
Read Id . . . . 13-14 Reading Data . . . 13-49
Read Data . . . 13-15 Write Waveshapes 13-50
Read Diagnostic 13-15 Read Waveshapes 13-52
Read Verify 13-15 Power On and Power Off Operations 13-54
Write ID . . . . 13-16 Power Sequence . . 13-54
Write Data . . . 13-17 Emergency Power Off . . . . . . 13-55
Scan Equal, Scan High or Equal, Scan
Low or Equal . . . . . . . . . . 13-18




Contents for 62PC Disk Drive and Attachment



II
62PC Disk Drive and Attachment

INTRODUCTION


62PC Disk Drive Subframe Disk Enclosure and Spindle Brake