The INIT (single-port) or INIT_A and INIT_B (dual-port) attributes define the output latches or output register values after configuration. The width of the INIT (INIT_A and INIT_B) attribute is the port width, as shown in Table 1. These attributes are hex-encoded bit vectors, and the default value is 0. In cascade mode, both the upper and lower block RAM should be initialized to the same value.