FEATURES

? Low-cost, monolithic SATURN? SONET/SDH ATM User Network Interface (UNI).

? Implements the ATM transmission convergence (TC) sublayer according to ATM Forum specifications using the SONET/SDH 155.52 Mbit/s STS- 3c/ STM-1, and 51.84 Mbit/s STS-1 formats.

? Supports ATM-Forum mid-range PHY and PMC-Sierra UNI-PHY? subrates at 25.92 and 12.96 Mbit/s.

? Supports UTP-5 or STP twisted pair wiring interface devices and optical driver and receiver modules for fiber optic cable interfaces.

? Includes on-chip, Bellcore-compliant clock recovery and clock synthesis.

? Operates in timing master or timing slave (loop timed) modes.

? Frames to SONET/SDH framing bytes (A1 and A2), processes the section and line Bit Interleaved Parity (B1 and B2) and the Far-End Block Error (Z2) bytes.

? Interprets the H1, H2, and H3 payload pointer bytes.

? Processes the SONET path overhead BIP-8 (B3), signal label (C2), and path status (G1) bytes.

? Inserts and extracts ATM payloads using ATM cell delineation.

? Provides on-chip FIFO buffers in both transmit and receive paths.

? Provides on-chip support for Generic Flow Control (GFC) and XOFF flow control.

? Provides a synchronous, 8-bit, plus parity SATURN-Compliant Interface for PHYsical layer devices (SCI-PHY?) bus operating at 33 MHz.

? Compatible with ATM Forum UTOPIA interface format, with support for multi PHY applications.

? Provides a generic 8-bit microprocessor bus interface for configuration, control, and monitoring.

? Provides TTL-compatible inputs and outputs and differential PECL inputs.

? Low power, +5 V CMOS technology.

? Packaged in a 128-pin 14 mm by 20 mm Plastic Quad Flat Pack (PQFP) with 0.5 mm lead pitch.

APPLICATIONS

? 155.52, 51.84, 25.92 and 12.96 Mbit/s Twisted Pair or Optical ATM LANs

? Workstations and Personal Computer NIC Cards

? Switches, Hubs, and Router Port Cards

? SONET- or SDH-Compliant ATM UNIs