The total width of an entry is calculated as:
Entry Width = KEY_WIDTH + RESPONSE_WIDTH +
PRIORITY_WIDTH + CTRL
The control bits add up to nine extra bits 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.