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Altera_Forum
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12 years ago

cyclone ii fpga rgmii support

hi, iam using cyclone ii fpga (ep2c50),does it support rgmii interfacing and iam using micrel ksz9021 phy. what are the supported rj45 for this phy.can u please tell me. thanks and re...
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Altera_Forum
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12 years ago

RGMII relies on Double Data Rate (DDR) transfers. Cyclone II supports this.

The dc characteristics and timing specifications (http://www.altera.com/literature/hb/cyc2/cyc2_cii51005.pdf) for Cyclone II discusses the 'Maximum Input and Output Clock Rate'. For RGMII you need a clock rate of 125MHz - which Cyclone II will do.

Finally, Altera's triple-speed ethernet (http://www.altera.co.uk/literature/ug/ug_ethernet.pdf) is supported by the Cyclone II family.

So, yes - Cyclone II is capable of supporting a Micrel KSZ9021 Phy (as used on a number of Terasic dev boards) via RGMII.

Regards,

Alex