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MACH231SP-12VC Datasheet(PDF) 8 Page - Lattice Semiconductor |
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MACH231SP-12VC Datasheet(HTML) 8 Page - Lattice Semiconductor |
8 / 48 page 8 MACH 1 & 2 Families The output macrocell (Figure 3) sends its output back to the switch matrix, via internal feedback, and to the I/O cell. The feedback is always available regardless of the configuration of the I/O cell. This allows for buried combinatorial or registered functions, freeing up the I/O pins for use as inputs if not needed as outputs. The basic output macrocell configurations are shown in Figure 4. The buried macrocell (Figure 5) does not send its output to an I/O cell. The output of a buried macrocell is provided only as an internal feedback signal which feeds the switch matrix. This allows the designer to generate additional logic without requiring additional pins. The buried macrocell can also be used to register or latch inputs. The input register is a D-type flip-flop; the input latch is a transparent-low D-type latch. Once configured as a registered or latched input, the buried macrocell cannot generate logic from the product-term array. The basic buried macrocell configurations are shown in Figure 6. Figure 3. Output Macrocell Note: 1. Latch option available on MACH 2 devices only. CLK0 CLKn 1 0 1 0 AR AP Q D/T/L1 To Switch Matrix Sum of Products from Logic Allocator PAL-Block Asynchronous Preset To I/O Cell PAL-Block Asynchronous Reset 14051K-004 |
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