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6

Here's a good clue: - And, if you look at the value for \$t_4\$ it is quoted here: - So, a new data bit is available between 0 and 40 ns of the falling edge of SCLK. This means you can't rely on the falling edge of SCLK to read valid data. Of course, if you look at \$t_7\$ it tells you that current data is valid for maybe 7 ns should you attempt to read it ...


3

The safest time to capture data is ... immediately before the SCLK falling edge. If you are rolling your own SDI interface, you can arrange this any way you like. It is tempting to capture data on the positive SCLK edge ... but... with the maximum SCLK frequency of 20MHz, an SCLK period of 50 ns assures the SCLK rising edge is 25 ns after the falling edge. ...


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