I would like to constrain two RAMB18 symbols to the same RAMB18X2 block RAM component without locking them to a particular site. I understand that BEL constraints can be used to do this, but what values should I use?
RAMB18 symbols can be constrained with BEL values of "LOWER" and "UPPER." The following is an example of the UCF syntax needed:
INST "v5_emac_ll/client_side_FIFO_emac0/tx_fifo_i/ramgen_l" BEL = LOWER ;
INST "v5_emac_ll/client_side_FIFO_emac0/tx_fifo_i/ramgen_u" BEL = UPPER ;