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| XC3000 | XC4000E | XC4000X | XC5200 | XC9000 | Spartan | SpartanXL | Spartan2 | Virtex |
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| N/A | Primitive | Primitive | N/A | N/A | Primitive | Primitive | Primitive | Primitive |
ROM16X1 is a 16-word by 1-bit read-only memory. The data output (O) reflects the word selected by the 4-bit address (A3 - A0). The ROM is initialized to a known value during configuration with the INIT=value parameter. The value consists of four hexadecimal digits that are written into the ROM from the most-significant digit A=FH to the least-significant digit A=0H. For example, the INIT=10A7 parameter produces the data stream
0001 0000 1010 0111
An error occurs if the INIT=value is not specified. Refer to the appropriate CAE tool interface user guide for details.