The lookup table in each LUT unit can generate any logic expression OUT as a function of three inputs (IN[2:0]), as shown in Figure 1. One or more inputs can be masked. The truth table for the expression is defined by TRUTH bits in LUT Control x register (LUTCTRLx.TRUTH).

Figure 1. Truth Table Output Value
Selection

IN[2] | IN[1] | IN[0] | OUT |
---|---|---|---|

0 | 0 | 0 | TRUTH[0] |

0 | 0 | 1 | TRUTH[1] |

0 | 1 | 0 | TRUTH[2] |

0 | 1 | 1 | TRUTH[3] |

1 | 0 | 0 | TRUTH[4] |

1 | 0 | 1 | TRUTH[5] |

1 | 1 | 0 | TRUTH[6] |

1 | 1 | 1 | TRUTH[7] |