CMOS ST-BUS FAMILY MT8931B Subscriber Network Interface Circuit Preliminary Information Features • • • • • ISSUE 2 CCITT I.430 and ANSI T1.605 S/T interface Full-duplex 2B+D, 192 kbit/s transmission Link activation/deactivation D-channel access contention resolution Point-to-point, point-to-multipoint and star configurations Master (NT)/Slave (TE) modes of operation Exceeds loop length requirements August 1993 Ordering Information MT8931BC 28 Pin Ceramic DIP MT8931BE 28 Pin Plastic DIP MT8931BP 44 Pin PLCC -40°C to +85°C Description d e et e d • Complete loopback testing capabilities h n n s e g • On chip HDLC D-channel protocoller i ta m s a • 8 bit Motorola/Intel microprocessor interface m De 1C 1B d • Microprocessor-controlled operation o c ew 893 93 e • Mitel ST-BUS interface 8 D-channel protocoller is included and R N T An THDLC • Low power CMOS technology t M controlled r e M ullport. through a Motorola/Intel microprocessor o o • Single 5 volt power supply N f e rf S y fo The MT8931B is fabricated in Mitel’s CMOS process. Applications • • The MT8931B Subscriber Network Interface Circuit (SNIC) implements the CCITT I.430 and ANSI T1.605 Recommendations for the ISDN S and T reference points. Providing point-to-point and pointto-multipoint digital transmission, the SNIC may be used at either end of the subscriber line (NT or TE). r • • • • • cto a f t l u ISDN NT1 ISDN S or T interface ISDN Terminal Adaptor (TA) Digital sets (TE1) - 4 wire ISDN interface Digital PABXs, Digital Line Cards (NT2) s n Co DSTi D-channel Priority Mechanism ST-BUS Interface LTx S-Bus Link Interface DSTo VBias LRx F0od PLL C4b HDLC Transceiver Timing and Control F0b STAR/Rsto Link Activation Controller VDD XTAL1/NT XTAL2/NC VSS Microprocessor Interface Rsti HALF AD0-7 R/W/WR DS/RD AS/ALE CS IRQ/NDA Figure 1 - Functional Block Diagram 10-71 MT8931B Notes: 10-72 Preliminary Information http://www.zarlink.com World Headquarters - Canada Tel: +1 (613) 592 0200 Fax: +1 (613) 592 1010 North America - West Coast Tel: (858) 675-3400 Fax: (858) 675-3450 Asia/Pacific Tel: +65 333 6193 Fax: +65 333 6192 North America - East Coast Tel: (978) 322-4800 Fax: (978) 322-4888 Europe, Middle East, and Africa (EMEA) Tel: +44 (0) 1793 518528 Fax: +44 (0) 1793 518581 Information relating to products and services furnished herein by Zarlink Semiconductor Inc. trading as Zarlink Semiconductor or its subsidiaries (collectively “Zarlink”) is believed to be reliable. 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