The HOTLink II(TM) family of physical layer (PHY) devices is a point-to-point or point-to-multipoint communications building block that provide serialization, deserialization, selectable 8B/10B encoding/decoding and framing functions. The family of devices are used in both SD (Standard Definition) and HD (High Definition) SDI (Serial Digital Interface) applications, i.e. SMPTE 259M-CD (270 and 360 Mbps), and SMPTE 292M (1.485 and 1.485/1.001 Gbps). This application note discusses the various clocking options that can be used in these applications when using the HOTLink II device. The application note focuses on HD-SDI applications at the 1.485 Gbps data rate, but can equally be applied in SD- and HD-SDI 1.485/1.001 Gbps environments by simply substituting the appropriate frequency for REFCLKx, via a clock oscillator or VCXO.
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