1.3.2. AND/OR Mode
Simplistically, this can be compared to bits being ANDed with a MASK, and ORed with new values, allowing multiple PR regions to vertically overlap a single column. In the first pass, all the bits in the CRAM frame for a column passing through a PR region are ANDed with '0's while those outside the PR region are ANDed with '1's. After the first pass, all the CRAM bits corresponding to the PR region are reset without modifying the static region. In the second pass for each CRAM frame, new data is ORed with the current value of 0 inside the PR region, and in the static region, the bits are ORed with '0's so they remain unchanged. The programming file size of a PR region using the AND/OR mode could be twice the programming file size of the same PR region using SCRUB mode.
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