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LFECP33E-3FN256I Datasheet(PDF) 9 Page - Lattice Semiconductor |
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LFECP33E-3FN256I Datasheet(HTML) 9 Page - Lattice Semiconductor |
9 / 163 page 2-6 Architecture Lattice Semiconductor LatticeECP/EC Family Data Sheet Figure 2-5. Distributed Memory Primitives ROM Mode: The ROM mode uses the same principal as the RAM modes, but without the Write port. Pre-loading is accomplished through the programming interface during configuration. PFU Modes of Operation Slices can be combined within a PFU to form larger functions. Table 2-4 tabulates these modes and documents the functionality possible at the PFU level. Table 2-4. PFU Modes of Operation Logic Ripple RAM 1 ROM LUT 4x8 or MUX 2x1 x 8 2-bit Add x 4 SPR16x2 x 4 DPR16x2 x 2 ROM16x1 x 8 LUT 5x4 or MUX 4x1 x 4 2-bit Sub x 4 SPR16x4 x 2 DPR16x4 x 1 ROM16x2 x 4 LUT 6x 2 or MUX 8x1 x 2 2-bit Counter x 4 SPR16x8 x 1 ROM16x4 x 2 LUT 7x1 or MUX 16x1 x 1 2-bit Comp x 4 ROM16x8 x 1 1. These modes are not available in PFF blocks DO1 DO0 DI0 DI1 AD0 AD1 AD2 AD3 WRE CK DO0 AD0 AD1 AD2 AD3 DPR16x2 SPR16x2 ROM16x1 RDO1 RDO0 DI0 DI1 WCK WRE WDO1 WDO0 WAD0 WAD1 WAD2 WAD3 RAD0 RAD1 RAD2 RAD3 |
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