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OR2C15A Datasheet(PDF) 8 Page - Lattice Semiconductor |
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OR2C15A Datasheet(HTML) 8 Page - Lattice Semiconductor |
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8 / 192 page  8 Lattice Semiconductor Data Sheet ORCA Series 2 FPGAs January 2002 Programmable Logic Cells (continued) The LUT ripple mode operation offers standard arith- metic functions, such as 4-bit adders, subtractors, adder/subtractors, and counters. In the ORCA Series 2, there are two new ripple modes available. The first new mode is a 4 x 1 multiplier, and the second is a 4-bit comparator. These new modes offer the advan- tages of faster speeds as well as denser logic capabili- ties. When the LUT is configured to operate in the memory mode, a 16 x 2 asynchronous memory fits into an HLUT. Both the MA and MB modes were available in previous ORCA architectures, and each mode can be configured in an HLUT separately. In the Series 2, there are two new memory modes available. The first is a 16 x 4 synchronous single-port memory (SSPM), and the second is a 16 x 2 synchronous dual-port memory (SDPM). These new modes offer easier implementa- tion, faster speeds, denser RAMs, and a dual-port capability that wasn’t previously offered as an option in the ATT2Cxx/ATT2Txx families. If the LUT is configured to operate in the ripple mode, it cannot be used for basic combinatorial logic or memory functions. In modes other than the ripple, SSPM, and SDPM modes, combinations of operating modes are possible. For example, the LUT can be configured as a 16 x 2 RAM in one HLUT and a five-input combinatorial logic function in the second HLUT. This can be done by configuring HLUTA in the MA mode and HLUTB in the F5B mode (or vice versa). F4A/F4B Mode—Two Four-Input Functions Each HLUT can be used to implement two four-input combinatorial functions, but the total number of inputs into each HLUT cannot exceed five. The two QLUTs within each HLUT share three inputs. In HLUTA, the A1, A2, and A3 inputs are shared by QLUT2 and QLUT3. Similarly, in HLUTB, the B1, B2, and B3 inputs are shared by QLUT0 and QLUT1. The four outputs are F0, F1, F2, and F3. The results can be routed to the D0, D1, D2, and D3 latch/FF inputs or as an output of the PFU. The use of the LUT for four functions of up to four inputs each is given in Figure 4. F5A/F5B Mode—One Five-Input Variable Function Each HLUT can be used to implement any five-input combinatorial function. The input ports are A[4:0] and B[4:0], and the output ports are F0 and F3. One five or less input function is input into A[4:0], and the second five or less input function is input into B[4:0]. The results are routed to the latch/FF D0 and latch/FF D3 inputs, or as a PFU output. The use of the LUT for two independent functions of up to five inputs is shown in Figure 5. In this case, the LUT is configured in the F5A and F5B modes. As a variation, the LUT can do one function of up to five input variables and two four-input functions using F5A and F4B modes or F4A and F5B modes. 5-2753(F).r2 Figure 4. F4 Mode—Four Functions of Four- Input Variables 5-2845(F).r2 Figure 5. F5 Mode—Two Functions of Five-Input Variables QLUT2 A3 A3 A2 A1 A0 A2 A1 A0 F2 QLUT3 A4 A4 A3 A2 A1 A3 A2 A1 F3 HLUTA QLUT0 B3 B3 B2 B1 B0 B2 B1 B0 F0 QLUT1 B4 B4 B3 B2 B1 B3 B2 B1 F1 HLUTB QLUT3 QLUT2 F3 QLUT1 QLUT0 B4 B3 B2 B1 B0 F0 WEA A3 A2 A1 A0 B4 B3 B2 B1 B0 A4 A3 A2 A1 A0 HLUTA HLUTB c0 WPE WD3 WD2 WD3 WD2 F2 |
Similar Part No. - OR2C15A |
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Similar Description - OR2C15A |
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