The total width of an entry is calculated as:
Entry Width = KEY_WIDTH + RESPONSE_WIDTH +
PRIORITY_WIDTH + 1
The valid bit adds one extra bit to the entry
width. In order to access the whole entry in parallel a number of block RAMs or URAMs
are used. Block RAMs are allocated in data width increments of 64 bits. URAMs are
allocated in data width increments of 128 bits (except for entry widths of 64 bits and
less). To avoid quantification losses it is beneficial if the entry size is close below
or on a data width 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 widths are listed in the following table.