Each function generator in both SLICEMs and SLICELs can implement a 64 x 1-bit ROM. Three configurations are available: ROM64X1, ROM128X1, and ROM256X1. ROM contents are loaded at each device configuration. The following table shows the number of LUTs occupied by each ROM configuration size.
| ROM | Number of LUTs |
|---|---|
| 64 x 1 | 1 |
| 128 x 1 | 2 |
| 256 x 1 | 4 |