Read Operation - 3.2 English

In SCK ratio = 2 scenarios, a successful read operation occurs when the SPI data, launched on the falling-edge of SCK, is captured on the second rising-edge of ext_spi_clk. This means that the data should be available and stable at the time the capture happens on the second rising edge.

The worst case scenario occurs when:

•   SCK has max delay on the line (that is, Max delay of STARTUP)

•   SPI drives the data with max T_co 

F_max4 = fn {STARTUP delay max, T_co-max, board routing}

Thus the actual F_max is the one that is most restrictive amongst F_max2, F_max3 and F_max4.