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OR2T10A-7M256I Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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9 / 192 page Lucent Technologies Inc. 9 Data Sheet June 1999 ORCA Series 2 FPGAs Programmable Logic Cells (continued) F5M and F5X Modes—Special Function Modes The PFU contains logic to implement two special func- tion modes which are variations on the F5 mode. As with the F5 mode, the LUT implements two indepen- dent five-input functions. Figure 6 and Figure 7 show the schematics for F5M and F5X modes, respectively. The F5X and F5M functions differ from the basic F5A/ F5B functions in that there are three logic gates which have inputs from the two 5-input LUT outputs. In some cases, this can be used for faster and/or wider logic functions. As can be seen, two of the three inputs into the NAND, XOR, and MUX gates, F0 and F3, are from the LUT. The third input is from the C0 input into PFU. Since the C0 input bypasses the LUTs, it has a much smaller delay through the PFU than for all other inputs into the special PFU gates. This allows multiple PFUs to be cascaded together while reducing the delay of the criti- cal path through the PFUs. The output of the first spe- cial function (either XOR or MUX) is F1. Since the XOR and MUX share the F1 output, the F5X and F5M modes are mutually exclusive. The output of the NAND PFU gate is F2 and is always available in either mode. To use either the F5M or F5X functions, the LUT must be in the F5A/F5B mode; i.e., only 5-input LUTs allowed. In both the F5X and F5M functions, the out- puts of the five-input combinatorial functions, F0 and F3, are also usable simultaneously with the special PFU gate outputs. The output of the MUX is: F1 = (HLUTA & C0) + (HLUTB & C0) F1 = (F3 & C0) + (F0 & C0) The output of the exclusive OR is: F1 = HLUTA ⊕ HLUTB ⊕ C0 F1 = F3 ⊕ F0 ⊕ C0 The output of the NAND is: F2 = HLUTA & HLUTB & C0 F2 = F3 & F0 & C0 5-2754(F).r3 Figure 6. F5M Mode—Multiplexed Function of Two Independent Five-Input Variable Functions 5-2755(F).r2 Figure 7. F5X Mode—Exclusive OR Function of Two Independent Five-Input Variable Functions QLUT3 QLUT2 A4 A4 A3 A2 A1 A0 A3 A2 A1 A0 QLUT1 QLUT0 B4 B4 B3 B2 B1 B0 B3 B2 B1 B0 C0 F3 F0 F1 F0 F2 F3 A4 A4 A3 A2 A1 A0 A3 A2 A1 A0 B4 B4 B3 B2 B1 B0 B3 B2 B1 B0 C0 F3 F0 F1 F0 F2 F3 HLUTA HLUTB |
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