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Overview
The VSC8574 evaluation board provides the user a way to evaluate the VSC8574 device in multiple configurations. Four RJ-45 connectors are provided for copper media interfaces. The four SFP cages allow for evaluation of the fiber media interconnects. The MAC interface is provided via SMA connectors or alternatively through SFP ports.
For access to all of the features of the device, an external microcontroller is used to configure the onboard clock chip via a two wire serial bus and the VSC8574 via the MDIO bus. The graphical user interface (GUI) enables the user to access the registers.
The evaluation board uses a Zarlink device to synthesize a 125MHz reference clock signal from a 20MHz crystal which serves as the REFCLK input.
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