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