Describes the implementation of the SFI-4 interface on altera devices
This chapter focuses on implementing the SFI-4 interface, which connects the SERDES and framer in OC-192 SONET systems. The Optical Internetworking Forum (OIF) standard SFI-4 is a 16-bit LVDS interface used to link the framer and the serializer/deserializer (SERDES). Stratix and Stratix GX devices support the required data rates of up to 622.08 Mbps along with the one-to-one relationship required between clock frequency and data rate.
The document describes the system topology, including the use of 16 channels of source-synchronous LVDS. It details the interface implementation using embedded SERDES circuitry and fast phase-locked loops (PLL) to support high clock frequencies. The text covers both the transmitter and receiver blocks, explaining how parallel data is converted to serial data and vice versa, and how clocks are generated and managed within the Stratix and Stratix GX devices.
| Data Rate | 622.08 Mbps |
|---|---|
| Clock Frequency | 622.08 MHz or 311.04 MHz |
| Interface Type | 16-bit LVDS |
| Supported Devices | Stratix & Stratix GX |
SFI-4 is a 16-bit LVDS interface used in an OC-192 SONET system to link the framer and the serializer/deserializer (SERDES).
The device uses embedded SERDES circuitry and a fast PLL to support the high clock frequencies and one-to-one relationship between clock and data rate.