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EK-CI780-UG-001

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Document:	CI780 User's Guide
Order Number:	EK-CI780-UG
Revision:	001
Pages:	42
Original Filename:

OCR Text

EX-CI780-UG-001

C1780 USER'S GUIDE

Prepared by Educational Services
of

Digital Equipment Cormporation

The information in this document is subject 10 change without notice
and should not be construed as a commitment by Digital Equipment

Corporation. Digital Equipment Corporation assumes no responsibility
for any errors that may appear in this document.

Printed in USA.

The manuscript for this book was created on a DIGITAL Word
Processing System and, via a translation program, was sutomatically

typeset on DIGITAL's DECset Integrated Publishing System. Book
production was done by Educationsl Services Development and
Publishing in South Lawrence, MA.

The following are trademarks of Digital Equipment Corporation:

DECiape

Rainbow

DECwriter
DIBOL

RSX
UNIBUS

DECnet

MASSBUS

VAX

DECset

PDP

VMS

DECsystem-10
DECSYSTEM-20

P/OS
Professional

VT
Work Processor

DATATRIEVE

DECUS

DEC
DECmate

RSTS

TABLES
CI7B0 SPeCifiCAtIONS ......oceooiiiiieeeierecciireste
e es e et as e se e e ee e s tareseraans 1-4
Related Hardware and Software Document ..............cc.oooooiviiiiiiiiic
e 1-5

Node Address SWitch SEtngS .............cceeeireveeieeceviieenririienecsnsereesseeeeesevsnens 2-19
SBI Address ASSIBNMENT ..........oooeiieeeirccrctvre
v seeeere s eretes s Vereueseeisaneans B-1
SBI Configuration Register ........... eatesree
i
e ettt n e sae s re e cearenseareaan B-2
Port Maintenance Control and Status Register.............cccveveevevevveeneerineenns vevisernase B4
Maintenance AdAress REGISIET ..........c..ccrevieieceeiercceiecresesree
s e s sassevenns B-6
Port Status REISLET ........c.cooiiiiiiriiiccirrrees
e er e eae erererreeareaes e BT
Port Error Status Regster ............oviiiiiiiiiier et
saenas B-8

Port Parameter REGISIEr ...........uviiiiiiieiiececee
e eeee e v
cer e s e s B-10

CHAPTER 1
INTRODUCTION

1.1

THE COMPUTER INTERCONNECT

The Computer Interconnect (C1) is a high-speed, serial data bus used to link computer subsystems (nodes)
to form a CI cluster. Typically, the cluster is confined to a computer room environment. Nodes may consist
of CPUs, memory, and intelligent mass storage, communication, and data acquisition subsystems. Features
of the ClI include:
Dual signal paths capable of simultaneoiis operation

70 megabit/sec path bandwidth
Low error rates
Packet-oniented transmission
Immediately acknowledges successful packet receipt

Contention arbitration (light loading)
Round-robin arbitration (heavy loading)

Each node within a CI cluster connects to the CI via an interface that provides two separate signal paths

(Figure 1-1). Dual paths provide a high degree of data availability between nodes. One pair of nodes can
communicate over one path (path A), while another pair of nodes communicates over the second path (path
B).
A single CI path consists of a pair of bus cables {one for transmit, one for receive). These cables connect a
node and the signal distribution coupler for that path. For each path, a central Star Coupler (SC008)
receives the data transmitted by a node and distributes this data to the other nodes within the cluster.

VAX

e——]

STAR
COUPLER A

117780 | 180

VAX

[&]

—

VAX

780 | 11/780

STAR
COUPLER B

JT 1

1111

[o]

11/780 | 180

VAX

780 | 1177280

Figure 1-1

4-Node CI Cluster

1-1

8182

1.2

THE CI1780 INTERFACE

The C1780 interface connects the Synchronous Backplane Interface (SBI) of a host VAX-11/780 system
to the CI (Figure 1-2).

NOTE
References to VAX-11/780 imply the VAX-11/782
Primary Processor.
The CI780 is an intelligent interface that functions as a buffered communications port. It uses the queue
structures provided under the VAX/VMS operating system to transfer messages and blocks of data
between the host system's memory and other nodes within the CI cluster. By providing the necessary data
buffering, address translation, and serial encoding/decoding, the CI780 reduces the amount of overhead
software processing required to complete typical high-level intercomputer communications.
The C1780 may be inctalled in any 4 inch option slot in either the standard CPU cabinet or H9602-H SBI
expansion cabinet of the host system. It consists of the following major components:
Four extended hex “L” series module:
padhodi
s B

Link Interface Module (IL1) LO100
Packet Buffer Module (IPB) L0101
Data Path Module (IDP) L0102
SBI Interface Module (ISI) L0104

Pressed pin backplane (P/N 70 17654)

VAX

11/780

MEMORY

ADAPTER

UNIBUS
_

ADAPTER

MASSBUS
ADAPTER

1780

TX/RX A

TxRxe

][

COUPLER A

STAR

COUPLE

TEgidt

Figure 1-2

Typical C1780 Connection

1-2

H7100 power supply with H7101 -5 V regulator (P/N 70 14956)

e TX/RX cable sets (2) with attached bulkhead connectors (P/N 70 18527)
NOTE
C1 bus cables and SCO08 Star Couplers are separate
options. They are not a part of the C1780 Interface
option.

Figure 1-3 shows the module-level block diagram of the C1780.
For the CI780 to operate correctly, the host VAX-11/780 system must have:
1.
2.
3.

Hardware at revision leve! 4 or higher.
Two (2) MBytes or more of memory installed.
VAX/VMS software version 3.1 or higher installed.

sai

DATA

PACKET

LINK

MODULE

INTERFACE

PATH

L0104

Lo102

MODULE

BUFFER

LO10Y

—.

TXPATH A

INTERFACE j#—————RX PATH A

L0100

fms TX PATH B
g RX PATH B

R8I0

Figure 1-3

CI780 Block Diagram

1.3

CI1780 SPECIFICATIONS

The C1780 specifications are outlined in Table 1-1.
Table 1-1

CI780 Specifications

Specification

Description

Data Format

Manchester encoded serial packets

Data Transfer Rate

5 MB/Sec maximum

Data Throughput

3 MB/Sec sustained

Modes

Uninitialized

SBI Priority Level

TRI14

Uninitialized/Maintenance
Disabled
Disabled/Maintenance
Enabled
Enabled /Maintenance

BR4

Half-duplex - BNCIA-XX shiclded coaxial cables, 45 meters

CI Cluster Cabling

(148 feet) maximum radius from coupler

Power

+5 V at 48.3A nominal

-5.2 V at 10A nominal

10° C 10 40° C (50° F to 104° F) with a temperature gradient of

Operating Temperature

20° C/hour (36° F/hour)

Range

Operating Relative

10% to 90% with a wet bulb temperature of 28° C (82°F), and a

Humidity Range

minimum dew point of 2° C (36° F)

Operating Altitude

Sea level to 2400 meters (8000 ft)

Range

1.4

Derate the maximum allowable operating temperature by 1.8°
C/1000 meters (1° F/1000 feet) for operation above sca level