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TMC2074-NU

Dual Mode CircLink™ Controller

SMSC -> Microchip 

Dual Mode CircLink™ Controller

Datasheet

1.2 About TMC2074

The TMC2074 network controller is CircLink technology’s flagship product. The TMC2074’s flexibility and

rich feature set enable a high-reliability and high-performance, real-time and control-oriented network

without the cumbersome middle layer protocol stacks and complex packet prioritization schemes typically

required.

TMC2074 operates at network data transfer rates up to 5 Mbps. Its embedded 1 kByte RAM can be

configured into a maximum of 32 pages to implement a 31-node network where each node in the network

has the same local memory.

The TMC2074 has two operational modes: “Peripheral Mode” and “Standalone Mode”. It can operate with

or without the existence of a system CPU on a network node. In Peripheral Mode, the TMC2074 has two

selectable communication modes, “Free Format Mode” and “Remote Buffer Mode”. Free Format mode,

retained from ARCNET, is “packet oriented” communication. Remote Buffer mode communication is a

CircLink-specific feature, and is a token oriented communication, which includes automatic data

transmission when the token arrives.

The TMC2074 has a flexible 8-bit or 16-bit databus to interface various CPU types including X86, 68XX,

and SHX with multiplexed or non-multiplexed address/data. When operating in Peripheral mode, the

TMC2074 has 8-bit programmable I/O available. When operating in Standalone mode, the TMC2074’s I/O

configuration is16-bit. The TMC2074 also integrates a 3-port hub (two ports for external connection) to

accommodate various network topologies (Bus, Star, etc.) and combinations.

SMSC TMC2074

Page 7

DATASHEET

Revision 0.1 (03-29-06)

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