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