Text preview for : SY31-0458-3_Section_11_Work_Station_Attachment.pdf part of IBM SY31-0458-3 Section 11 Work Station Attachment IBM system34 fe SY31-0458-3_System_34_5340_System_Unit_Theory_Diagrams_Manual_Jul79 SY31-0458-3_Section_11_Work_Station_Attachment.pdf



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Contents
WORK STATION ATTACHMENT . 11-1
INTRODUCTION 11-1
DATA FLOW . . . . 11-2
FUNCTIONAL UNITS 11-3
Channel Interface . 11-3
Controller Interface 11-4
Serial Interface . . 11-5
SERIAL INTERFACE TO WORK STATIONS. 11-6
Data Transmissions . . . . . . . 11-6
Phase Encoded Data . . . . . 11-6
Predistorted and Distorted Data . 11-7
Differential Data 11-7
Bit Synchronization . . 11-8
Frame Synchronization . 11-8
Line Turnaround 11-8
Typical Transmission Sequences . 11-8
Examples of Transmission Sequences 11-9
Commands . . 11-11
Frame Formats . . 11-11
OPERATIONS . . . . 11-12
Displaying a Message 11-13
Transmit and Receive Operations 11-14
Transmit Operation 11-14
Receive Operation . 11-15
COMMANDS . . . . 11-16
I/O Load Command . 11-16
I/O Control Load Command 11-18
I/O Sense Command 11-20
Jump on I/O Command . . 11-22
Sense Interrupt Level Status Byte Command 11-23
ERROR CONDITIONS . . . . . . 11-24
Controller Storage Parity Check , 11-25
Controller DBO/DBI Parity Check 11-27
Long Time-out Check . . . . . 1"-27
Serial Parity Check . . . . . . 11-28
Work Station Controller Check (Any Check) 11-28
Channel DBO Parity Check. 11-28
BASE CYCLE STEAL. . 11-29
INPUT /OUTPUT LINES 11-30




Contents for ,Work Station Attachment
Work Station Attachment

INTRODUCTION


In System/34, the work station attachment
controls from one to a maximum of eight work
stations. One of the work stations, a 5251
Display Station or a 5252 Dual Display Station,
is the system console and must be attached to
System/34 on port O. Then, at the customer's
option, up to seven additional work stations can
be attached to ports 1 through 3. These
additional work stations can be either 5251 or
on Attachment
5252 Display Stations, 5256 Printers, or a
combination of them.

All work stations communicate with the Work Station
attachment through a 16-bit serial data stream Controller Card Storage Cards
via twinaxial cables. For a description of the
data stream, see Serial Interface to Work
Stations later in this section.
CPU Control Field, Data, Status Commands
The work station attachment circuits are located
Work Station and
on the A-gate, A2 board, and include the
following:
Control
Storage
Controls Adapter Card I ./ Data