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LC5768MV-52Q208C Datenblatt(PDF) 8 Page - Lattice Semiconductor |
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LC5768MV-52Q208C Datenblatt(HTML) 8 Page - Lattice Semiconductor |
8 / 92 page Lattice Semiconductor ispXPLD 5000MX Family Data Sheet 8 Macrocell The 32 registered macrocells in the MFB are driven by the 32 outputs from the PTSA or the PTSA bypass. Each macrocell contains a programmable XOR gate, a programmable register/latch flip-flop and the necessary clocks and control logic to allow combinatorial or registered operation. All macrocells have an output that feeds the GRP. Selected macrocells have an additional output that feeds the OSA and hence I/Os. This dual or concurrent output capability from the macrocell gives efficient use of the hardware resources. One output can be a registered function for example, while the other output can be an unrelated combinatorial function. A direct register input from the I/O cell facilitates efficient use of the macrocell to construct high-speed input registers. Macrocell registers can be clocked from one of several global or product term clocks available on the device. A global and product term clock enable is also provided, eliminating the need to gate the clock to the macrocell registers directly. Reset and preset for the macrocell register is provided from both global and product term signals. The macrocell register can be pro- grammed to operate as a D-type register or a D-type latch. Figure 8 is a graphical representation of the macrocell. Figure 8. Macrocell Memory Modes The ispXPLD 5000MX architecture allows the MFB to be configured as a variety of memory blocks as detailed in Table 4. The remainder of this section details operation of each of the memory modes. Additional information regarding the memory modes can also be found in technical note number TN1030, Using Memory in ispXPLD 5000MX Devices. PTSA Bypass From I/O Cell Output to I/O Block GRP PT Clock From PTSA PT Preset PT Reset Shared PT Reset Shared PT CE CLK0 CLK1 Shared PT Clock CLK2 CLK3 Global Reset Clk En Clk R/L D PR Q |
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Ähnliche Beschreibung - LC5768MV-52Q208C |
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