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1

Introduction

The INMOS communication link is a high speed system interconnect which provides full duplex communi-

cation between members of the transputer family, according to the INMOS serial link protocol. The

IMS C011, a member of this family, provides for full duplex transputer link communication with standard

microprocessor and sub-system architectures, by converting bi-directional serial link data into parallel

data streams.

All transputer products which use communication links, regardless of device type, support a standard com-

munications frequency of 10 Mbits/sec; most products also support 20 Mbits/sec. Products of different

type or performance can, therefore, be interconnected directly and future systems will be able to communi-

cate directly with those of today. The IMS C011 link will run at either the standard speed of 10 Mbits/sec

or at the higher speed of 20 Mbits/sec. Data reception is asynchronous, allowing communication to be in-

dependent of clock phase.

The link adaptor can be operated in one of two modes. In Mode 1 the IMS C011 converts between a link

and two independent fully handshaken byte-wide interfaces, one input and one output. It can be used by

a peripheral device to communicate with a transputer, a peripheral processor or another link adaptor, or

it can provide programmable input and output pins for a transputer. Two IMS C011 devices in this mode

can be connected back to back via the parallel ports and used as a frequency changer between different

speed links.

In Mode 2 the IMS C011 provides an interface between an INMOS serial link and a microprocessor system

bus. Status and data registers for both input and output ports can be accessed across the byte-wide

bi-directional interface. Two interrupt outputs are provided, one to indicate input data available and one

for output buffer empty.

Input

Interface

Output

Interface

System

Services

Link

8

8

Q0–7

Qack

QValid

I0–7

IAck

IValid

VDD

GND

CapMinus

ClockIn

Reset

SeparateIQ

LinkOut

LinkIn

Figure 1.1

IMS C011 Mode 1 block diagram

Interrupt

Control

Data and

Status

Registers

System

Services

Link

8

D0–7

InputInt

OutputInt

VDD

GND

CapMinus

ClockIn

Reset

SeparateIQ

LinkOut

LinkIn

Register

Select

LinkSpeed

RS0

RS1

RnotW

notCS

Figure 1.2

IMS C011 Mode 2 block diagram