DESCRIPTION
The PM5348 Dual SATURN User Network Interface (S/UNI-DUAL) is a monolithic integrated circuit that implements SONET/SDH processing and ATM mapping functions for two 155 Mbit/s or 51Mbit/s ATM User Network Interfaces. It is compliant with SONET and SDH requirements and ATM Forum User Network Interface specifications. The S/UNI-DUAL is software configurable, allowing feature selection without changes to external wiring.

FEATURES
• Single chip dual ATM User-Network Interface operating at 155.52 and 51.84 Mbit/s. Also capable of operating at ATM Forum mid-range PHY subrates of 25.92 and 12.96 Mbit/s.
• Provides essential hardware and software compatibility with industry-standard PM5346 S/UNI-LITE device.
• Implements the ATM Forum User Network Interface Specification and the ATM physical layer for Broadband ISDN according to CCITT Recommendation I.432.
• Processes two duplex 155.52 Mbit/s STS-3c/STM-1 or 51.84 Mbit/s STS-1 data streams with on-chip clock and data recovery and clock synthesis.
• Provides Saturn Compliant Interface - PHYsical layer (SCI-PHY™) FIFO buffers in both transmit and receive paths with parity support. Compatible with ATM Forum Utopia Level 2 specification. The FIFOs may be independently bypassed.
• Inserts and extracts the generic flow control (GFC) bits via a simple serial interface and provides a transmit XOFF function to allow for local flow control.
• Supports 8-bit and 16-bit multi-PHY modes and a direct dual 8-bit mode.
• Provides a generic 8-bit microprocessor bus interface for configuration, control, and status monitoring.
• Provides a 4-bit output port for external alarms and control.
• Provides a standard 5 signal IEEE 1149.1 JTAG test port for boundary scan test purposes.
• Low power, +5 Volt, CMOS technology.
• 160 pin high performance plastic quad flat pack (MQFP) 28 mm x 28 mm package.

APPLICATIONS
• Workstations and Personal Computers
• Switches and Hubs
• Routers
• SONET or SDH ATM Interfaces