The total width of an entry is calculated as:
Entry Width = KEY_WIDTH + RESPONSE_WIDTH +
PRIORITY_WIDTH + CTRL
The control bits one bit for the fixed rate
STCAM and up to (11 + total range width) for the variable rate STCAM to the entry width.
To access the whole entry in parallel a number of block RAMs or URAMs are used. Block
RAM and URAM are allocated in data width increments of 64 bits. To avoid quantification
losses it is beneficial if the entry size is close below or on a 64-bit boundary. For
example, if the total block RAM entry size is 308 bits, the quantification loss is only
12 bits per entry: 5*64 - 308 =
12.
The maximum supported entry width is 2048 bits.