CONTROLINK86 SMSC, CONTROLINK86 Datasheet - Page 6

• Manufacturer Part Number: CONTROLINK86
• Description: Development Software Embedded Networking Software
• Manufacturer: SMSC

Specifications of CONTROLINK86

• Tool Function: Compiler
• Tool Type: Compiler
• Processor Series: 80x86
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ControLink86 Realtime Networking Software
2.INTRODUCTION AND BASIC ARCHITECTURE
ControLink is designed to fit into a layered network architecture. The most commonly-used network
architecture is based on the OSI (Open System Interface) stack. The OSI layered architecture defines
only the interfaces and functionality between the seven layers of the OSI stack but does not describe a
particular protocol or implementation. The advantage of using such an architecture is that it can be easily
transported across many types of applications and provides for an easy to maintain and understandable
architecture. The full OSI implementation is a seven layer stack that calls for many functions that are not
pertinent to real-time or industrial applications. Many industrial networks such as ISA’s proposed SP50
project, the Interoperable Systems Project (ISP), AHSRAE’s BACNET, Siemens’ PROFIBUS, and the
French FIP all use a streamlined version of the OSI stack that implements only three of the seven layers.
In the streamlined or collapsed OSI stack only layer 7 (the Application layer), layer 2 (Data link), and layer
1 (Physical layer) are used (see Figure 1). ControLink is combined with SMSC’s COM200xx family of
ARCNET Controllers for layers 1 and 2. The Application layer (layer 7) is inherently specific, as the name
suggests, to the application at hand. ControLink is intended to be a general purpose Data Link level driver
that can support a wide range of applications.
ControLink is based around the IEEE 802.2 Data Link level specification. Conforming to the 802.2
specification presents a well-known and accepted data standard to many upper layer protocols such as
ASHRAE’s BACNET and Novell’s Netware. Also, ISA’s SP50 and the ISP use many of same concepts
and procedures followed in the 802.2 specification. In addition to the basic 802.2 functionality, ControLink
contains many utilities that are commonly used including network mapping, initialization functions,
transferring the data between the physical network and logical addresses, compilation of network
statistics, and full error reporting.
Applications
Necessary
Realtime
Not
for
Full OSI Stack
FIGURE 1 - NETWORK LAYERS CONCEPTS
Presentation
Application
Transport
Data Link
Physical
Network
Session
6
Collapsed Stack
Application
Data Link
Physical
USER
COM20020
+
TRANSCEIVER
CONTROLINK