10.4.5.2.1 Parameter Rules for FIFO with Static Trigger Level

LEVEL ≤ DEPTH

If DEPTH > 256 not all values for Level are available (automatic value correction).

This holds true only for dynamically triggered FIFOs. For a static trigger, all depth values are possible. For dynamic triggers, only values that are divisible by the number of 256X9 FIFO blocks cascaded to achieve the required depth are possible.

For example, for a depth of 512, which uses two 256 blocks in cascade, only multiples of 2 are possible. For depth of 768, which uses three blocks, multiples of 3 are the only values possible for the LEVEL threshold.