AR# 34230 11.4 EDK, XPS_SPI - What is the clock relationship between SPI and PLB clocks in SPI slave mode?

What is the required clock relationship between SPI and PLB clocks in SPI slave mode?

The incoming SPI clock is synchronized with the PLB clock, and so must be frequency-aligned to the PLB clock.

A design with SCK_RATIO = 4 only has 2 PLB clock cycles to sample the SPI clock, and so the SPI clock must also be phase-aligned to the PLB clock.

SCK_RATIO values greater than 4 are not required to be phase-aligned.

AR# 34230
Date Created	01/28/2010
Last Updated	01/28/2010
Status	Active
Type
Tools	EDK - 11.1 EDK - 11.2 EDK - 11.3 EDK - 11.4
IP	XPS Serial Peripheral Interface

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