TMC2074 Dual Mode CircLinkTM Controller PRODUCT FEATURES Data Brief Low Power CMOS, 3.3 Volt Power Supply with 5 Volt Tolerant I/O Supports 8/16-Bit Data Bus -- Both 86xx and 68hxx Platforms 1K On-chip Dual Port Buffer Memory -- Sequential I/O Mapped Access Maximum 31 Nodes per Network Token Retry Mechanism Maximum 256 Bytes per Packet Consecutive Node ID Assignment Memory Mirror Network Standard Time Flexible Topologies Low Cost Media can be Used Fiber Optics and Twisted Pair Cable Supported 128-Pin, VTQFP Lead-Free RoHS Compliant Package Temperature Range from 0 to 70 Degrees C -- Bus, Star and Tree -- RS485 Differential Driver -- Network Time Synchronization -- Automatic Time Stamping Coded Mark Inversion -- Intelligent 1-Bit Error Correction -- Magnetic Saturation Prevention 3 Port Hub Integrated -- 1 Internal and 2 External -- Shared Memory within Network -- Free Format Mode -- Remote Buffer Mode Enhanced Token Passing Protocol from ARCNET -- -- -- -- Supports 8 Bit Programmable General Purpose I/O at peripheral Mode Supports 16 Bit Input and 16 Bit Output at Standalone Mode Dual Communication Modes (with Peripheral Mode) Dual Operation Modes -- Peripheral (Host) Mode Operates with MCU -- Standalone (I/O) Mode Operates without MCU SMSC TMC2074 PRODUCT PREVIEW Revision 0.2 (10-23-08) Dual Mode CircLinkTM Controller ORDER NUMBER: TMC2074-NU FOR 128 PIN, VTQFP LEAD-FREE ROHS COMPLIANT PACKAGE 80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123 Copyright (c) 2007 SMSC or its subsidiaries. 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Revision 0.2 (10-23-08) 2 PRODUCT PREVIEW SMSC TMC2074 Dual Mode CircLinkTM Controller General Description About CircLink The CircLink networking controller was developed for small control-oriented local network data communication based on ARCNET's token-passing protocol that guarantees message integrity and calculatable maximum cycle time. In a CircLink network, when a node receives the token it becomes the temporary master of the network for a fixed, short period of time. No node can dominate the network since token control must be relinquished when transmission is complete. Once a transmission is completed the token is passed on to the next node (logical neighbor), allowing it to be come the master. Because of this token passing scheme, maximum waiting time for network access can be calculated and the time performance of the network is predictable or deterministic. Control networking applications require predictable performance to ensure that controlled events occur when required. However, reconfiguration of a regular ARCNET network becomes necessary when the token is missed due to electronic and magnetic noise. In these cases, the maximum wait time for sending datagrams cannot be guaranteed and the real-time characteristic is impaired. CircLink makes several modification to the original ARCNET protocol (such as maximum and consecutive node ID assignment) to avoid token missing as much as possible and reduce the network reconfiguration time. CircLink implements other enhancements to the ARCNET protocol including a smaller-sized network , shorter packet size, and remote buffer mode operation that enable more efficient and reliable small, control-oriented LANs. In addition, CircLink introduces several unique features for reducing overall system cost while increasing system reliability. CircLink can operate under a special mode called "Standalone" or "I/O" mode. In this mode, CircLink does not need an administrating CPU for each node. Only one CPU is needed to manage a CircLink network composed up to maximum 31 nodes, reducing cost and complexity. In a CircLink network, the data sent by the source node is received by all other nodes in the network and stored according to node source ID. For the target node the received data is executed per ARCNET flow control and the data is stored in its buffer RAM. The receiving node processes the data while the remaining nodes on the network discard the data when the receiving node has completed. This memory-mirroring function assures higher reliability and significantly reduces network traffic. Network Standard Time (NST) is also a unique CircLink feature. NST is realized by synchronizing the individual local time on each network node to the clock master in the designated node from which the packet is sent. CircLink also uses CMI code for transmitting signals, rather than the dipulse or bipolar signals that are the standard ARCNET signals. Since CMI encoding eliminates the DC element, a simple combination of a standard RS485 IC and a pulse transformer can be used to implement a transformer-coupled network. SMSC TMC2074 3 PRODUCT PREVIEW Revision 0.2 (10-23-08) Dual Mode CircLinkTM Controller 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. Revision 0.2 (10-23-08) 4 PRODUCT PREVIEW SMSC TMC2074 Dual Mode CircLinkTM Controller Block Diagram nMUX Micro-Controller bus nRWM W16 nSWAP Others Clock nNSTCOUT FLASHO Memory Access Mediation Circuit Register Access Control Circuit Mode Setting Address pointer Address Multiplexer EC Command Page Register Address Register Buffer Memory Receive Mode(#01-#31) Diag. Register Receive Flag(#01-#31) Data Register H Interrupt Status Interrupt Mask Clock Master SID 512B Address Pointer Improved ARCNET Protocol Micro Sequencer 512B Working Registers Data Register L Net. Standard Time Data Latch Alarm Setting Receive SID TENT-ID Register Search SID CONFIG Register MAX ID Setting (MAXID) SETUP Registers Data Latch Shift Register TX Signal Generator RECON Timer Node ID Setting (NID) RX Synchronous circuit 3Port HUB Circuit Page Size Setting (PS) Data Rate Setting PIN-INFO CMI Encode Reset Circuit ERR-INFO MAXID NID CMI Decode OSC CMI Synchro PS CKP nSTALONE nDIAG nHUBON nCMIBYP TXEN2 TXEN TXD RXIN2 RXIN Figure 1 TMC2074 Internal Block Diagram SMSC TMC2074 5 PRODUCT PREVIEW Revision 0.2 (10-23-08) Dual Mode CircLinkTM Controller Package Outline D E E1 Ze D1 N 1 www M ccc A1 A2 e A W Zd R1 R2 T H 0.25mm L L1 Figure 2 TMC2074 128-Pin VTQFP Package Diagram Table 1 TMC2074 128-Pin VTQFP Package Parameters SYMBOL ITEMS MIN A A1 A2 D D1 E E1 H L L1 e T W www R1 R2 ccc N Overall Package Height Standoff Body Thickness X Span X body Size Y Span Y body Size Lead Frame Thickness Lead Foot Length Lead Length Lead Pitch Lead Foot Angle Lead Width Lead position Tolerance Lead Shoulder Radius Lead Foot Radius Coplanarity Pin count 0.05 0.95 15.8 13.8 15.8 13.8 0.09 0.45 0o 0.13 -0.035 0.08 0.08 - TYP MAX 0.6 1.0 0.4 Basic 0.18 128 1.2 0.15 1.05 16.2 14.2 16.2 14.2 0.2 0.75 7o 0.23 0.035 0.2 0.08 Notes: 1. Controlling Unit: millimeter. 2. Package body dimensions D1 and E1 do not include the mold protrusion. Maximum mold protrusion is 0.25 mm. Revision 0.2 (10-23-08) 6 PRODUCT PREVIEW SMSC TMC2074 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Microchip: TMC2074-NU