IBM 4381 User manual

Systems
GC20-2021-2
File No. 4300
A Guide to the IBM 4381
Processor
This guide presents hardware, 1/0 device, programming
systems, and other pertinent information describing the
significant new features and advantages
of the IBM 4381
Processor. Knowledge of System/370 or 4300 hardware
and 1/0 devices is assumed. The content of the guide is
intended to acquaint the reader with the 4381 Processor
and
to be of benefit in planning for its installation.
--...- -
----
--- -.-
___
- -. ---
--- ---
--- --
_ _..._,_

Third Edition (April 1986)
This edition is a major revision obsoleting GC20-2021-l. It discusses 4381 Processor
Model Groups 11, 12, 13, and 14. New and changed information
is indicated by a vertical
rule in the left margin.
This guide
is intended for planning purposes only. It will be updated from time to time;
however, the readers should remember that the authoritative sources of system
information are the system library publications for the 4381 Processor, its associated
components and its programming support. These publications will first reflect any
changes.
References in this publication to IBM products, programs, or services do not imply that
IBM intends to make these available in all countries in which IBM operates.
Publications are
not stocked at the address given below. Requests for copies of IBM
publications should be made to your IBM representative or to the IBM branch office
servicing your locality.
A form for readers' comments has been provided at the back of this publication.
If the
form has been removed, address comments to: IBM Corporation, Department 824, 1133
Westchester Avenue, White Plains, New York 10604. IBM may use or distribute
whatever information you supply in any way it believes appropriate without incurring any
obligation to you.
© Copyright International Business Machines Corporation 1984, 1985, 1986

Preface
This publication is designed for readers who are knowledgeable about System/370
architecture (as implemented in a System/370 or 4300 processor), and
4300/System/370 channels, 1/0 devices, and programming systems. Features of
4381 Processor model groups that are like the same features in 4341 Processors are
identified, and only those hardware and programming systems features of 4381
Processors that are different from those of 4341 Processors are described in detail.
Compatibility among the architectures implemented in 4381, other 4300, and
System/370 processors and their programming systems support
is also discussed.
Information about the currently available 4381 model groups (11, 12, 13, and 14)
and the withdrawn model groups (
1, 2, and 3) is given in this guide.
Preface iii

iv A Guide to the IBM 4381 Processor

Contents
Section 01 : Highlights 1
Section 10: Technology and Architecture 14
10:05 Technology 14
Introduction 14
Logic Chip, Module, and Board Design
15
Logic Cooling 19
Storage Technology
21
10:10 Architecture 21
System/370 Architecture 21
System/370 Extended Architecture 23
Section 20: 4381 Processor Uniprocessor Model Groups 27
20:05 Instruction Processing Function
28
General Description 28
Instruction Set 30
Multiply and Add Facility 32
Elementary Math Library Facility 32
Square Root Facility and Mathematical Function Facility 32
ECPS:MVS 33
ECPS:VM/370 34
Preferred Machine Assist 34
20: 10 Storage 34
Processor Storage 35
Auxiliary Storage 37
Storage Control Function 39
20:
15 Support Processor Subsystem 42
Components and Functions 42
System Diskette Drives 44
System Initialization 45
Natively Attached Devices 46
Support Bus Adapter 46
20:20 Channels 47
General Description 47
Device Addresses and Unit Control Words
For System/370 Mode 48
Subchannels
For System/370-XA Mode 50
General Operation of the Channels 52
Byte Multiplexer Channels 54
Block Multiplexer Channels 55
SIOF Instruction
For System/370 Mode 57
20:25 Standard and Optional Features 58
Standard Features 58
Optional Features 60
Contents V

Section 30: 4381 Processor Multiprocessor Model Groups 61
30:05 Configuration Description 61
30:10 Instruction Processing Function 63
General Description 63
Instruction Set 65
Other Features 66
30:15 Storage 66
Processor Storage 66
Auxiliary Storage
68
Storage Control Function 70
30:20 Support Processor Subsystem 74
Components and Functions 74
30:25 Channels 74
General Description 74
Device Addresses and Unit Control Words For System/370 Mode 76
Subchannels For System/370-XA Mode
78
General Operation of the Channels 78
Byte Multiplexer Channels 79
Block Multiplexer Channels 79
SIOF Instruction For System/370 Mode 80
30:30 Standard and Optional Features
81
Standard Features 81
Optional Features 83
Section 40: Operator Console 84
40:05 General Description 84
Operator/Operating System Communication Modes
85
Operator Control Panel 86
Keyboard 88
System Configuration Displays 89
40:10 Operator Displays 90
General Selection Display 90
40:15 Remote Operator Console Facility (ROCF)
91
40:20 Maintenance 93
Section ~O: Virtual Storage and Address Translation 94
Virtual Storage Organization 94
Address Translation
95
Section 60: Reliability, Availability, and Serviceability (RAS) 97
60:05 Introduction 97
60:10 Recovery Features 98
Automatic Instruction Retry 98
ECC Validity Checking On Processor Storage 99
1/0Operation Retry 101
Machine Check Facilities 101
Machine Check Analysis and Logging 108
Functional Diskette 1 Logouts 109
Power System 110
60:
15 Diagnostic and Remote Support Facilities 113
Problem Analysis 113
Support Processor Subsystem Diagnostics 115
Power Controller Adapter Diagnostics 116
vi A Guide to the IBM 4381 Processor

Instruction Processing Function Diagnostics 116
Error Logout Analysis Program
11 7
System Test 117
Remote Support Facility 117
Section 70: Programming Systems Support 119
70:05
DOS/VSE 119
70: 10
OS/VSl 120
70:15
MVS/370 120
70:20
VM/370 120
70:25
MVS/XA 121
70:30 VM/Extended Architecture Migration Aid 122
70:35 Virtual Machine/System Product-Entry 123
70:40 Virtual Machine/Extended Architecture Systems Facility 124
70:45 Programming Systems Support Table 125
Section 80: Comparison Table of Hardware -4341 Model Group 12 and 4381
Processors 127
80:05 Hardware Features of the 4341 Model Group 12 Processor and 4381 Model
Group 11, 12, 13, and 14 Processors 128
Index 134
Contents vii

Figures
1. The 4381 Processor and console 12
2. Two 64-mm MCMs 16
3. A 64-mm MCM being hand held 17
4. The 4381 MCM board without any modules mounted
18
5. 64-mm MCMs mounted on the MCM board 18
MCM board mounted within the 4381 Processor
19
6.
7.
8.
9.
64-mm MCM with a portion of the heat sink cut away 20
An impingement cooling nozzle ·20
Logical components in a 4381 Processor Model Group 11, 12, 13,
1, or
2
27
10. General flow of data between the channels and processor storage 53
11. Logical components in a 4381 Processor Model Group 14 or 3 62
12. Data flow to and from processor storage via the high-speed buffers in a 4381
Model Group
14 or 3 71
13. The General Selection display 90
14. Dialup of a remote 4381 Processor via a 3275 display
91
15. Dialup of a remote 4381 Processor via a host processor emulating a 3275
display 92
16. 4381 Processor machine check code 103
17. 4381 Processor machine check interruptions
105
viii A Guide to the IBM 4381 Processor

. ..._....
Section 01: Highlights
The 4381 Processor, available in four model groups, is an intermediate-scale,
general purpose processor that
is compatible with System/370, other 4300, and
30XX processors.
It implements System/370 architecture (as in System/370,
4300, and 30XX processors) and System/370 extended architecture (as in 308X
and 3090 processors).
Model Groups 11, 12, 13, and 14 of the 4381 Processor, which offer a wide range
of performance, are provided. Model Group 11, 12, and
13 4381 Processor units
are uniprocessors containing one instruction execution function. The Model Group
14 4381 Processor unit
is a dual processor that contains two instruction execution
functions each of which has its own channels. The Model Group
14 processor unit
operates
as a tightly coupled multiprocessing configuration under the control of one
operating system in which processor storage
is shared.
Field upgrades of 4381 Processor model groups
is supported. A 4381 Model
Group
11 Processor can be field upgraded to a 4381 Model Group 12 Processor, a
4381 Model Group 12 can be field upgraded to a 4381 Model Group 13, and a
4381 Model Group
13 can be field upgraded to a 4381 Model Group 14. This
support provides significant performance growth. The 4381 Model Group 14 has
an internal throughput rate of up to 4.9 times that of a 4381 Model Group
11 for
commercial processing and of up to 5.4 times that of a 4381 Model Group
11 for
scientific processing.
Model Groups
11through14 of the 4381 Processor offer improved price
performance relative to Model Groups
1, 2, and 3 of the 4381 Processor, which are
withdrawn from marketing,
as are model upgrades within these withdrawn model
groups. However, optional features, including processor storage upgrades, can be
installed in 4381 Model Group
1, 2, and 3 Processors. In addition, these
withdrawn model groups can be field upgraded to the current 4381 model groups
as follows: 4381 Model Group
1toa4381 Model Group 12 or 13, 4381 Model
Group 2 to a 4381 Model Group
13 or 14, and 4381 Model Group 3 to a 4381
Model Group
14.
The 4381 Processors offer higher internal performance and improved price
performance for intermediate system users relative to 4341 Processors. This
improved performance
is made possible by the use of large-scale integrated
technology for logic and processor storage. The logic packaging and cooling
designs implemented in 4381 Processors provide increased logic density without the
need for water cooling.
The
43 81 Processors support the range of commercial and engineering/scientific
data processing capabilities offered by System/370, 4300, and 30XX processors,
as well as the advanced functions provided by System/370 and System/370
extended architectures.
Section 01 : Highlights 1