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The I
2
C bus provides a simple two-wire means of communication. This protocol is used in many applications.
SDRAM modules implement a serial EEPROM that supports the I
2
C protocol. This is used so that a microprocessor
can read the EEPROM for configuration purposes.
This reference design documents an I
2
C Controller designed to interface with serial EEPROM devices. It is
intended to be a simple controller providing random reads cycles only. Typically, serial EEPROMs are programmed
at board assembly time and store configuration information, which is read by a microprocessor during power-up.
This design was implemented in Verilog, synthesized and fitted using Lattice¡¯s ispDesignEXPERT? software into a
ispMACH? 4A device. The design requires 46 macrocells and 24 I/O pins. Using an M4A-64/32-55 yields greater
than 153MHz performance. Results may vary according to the synthesis tool.
This design assumes the user has experience with I
2
C controllers. Information available in documents listed in the
Applicable Documents section, below, is not repeated in this document

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