【SD】What I Learn

1. Write down every detail of the test environment in case to rebuild it later.

2. Write down every unusual phenomenon no matter how negligible it looks.

3. Be humble! Research on the Spec carefully!

      e.g.

      (1) Neglect of a short time pause in SPI timing diagram described in the Spec caused unstable change of data line during next operation.

      (2) The definition of "sector" and "block" are not the same in the physical layer SD Spec as we learned before in other documents. See Erase Operation below.

4. Devils are in all details!

      (1) Consider default situations.

      (2) User friendly.

      (3) Legible spec.