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Altera_Forum
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17 years ago

RMII Mode Selection / Strapping CYCLONE III

Hi, I am working in ALTERA CYCLONE III . I have designed a module with the following NIOS II Processor + Custom Ethernet MAC working in RMII Mode + SSRAM. The Ethernet PHY used in this FPGA i...
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Altera_Forum
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17 years ago

The weak pull-up option on a Cyclone III is too weak for your Phy (it is 7k Min at 3.3V) so you must have an external pull-up.