I want to confirm about the meaning of the word "Pull up" in Table 30-1 at following document.
In the Table 30-1, there is a column that named "Pull up".
What is this mean ?
Does the user should be pull up for each signals ?
However, in the schematics of SABRE Platform for Tablets Reference Design based on i.MX53, the SD1_DATA0, SD1_DATA1 and SD1_DATA2 signals are not pull-uped.
Because of those difference, I'm confusing.
So please let me know the meaning of the column.