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LC51024MC-5FN208I Datasheet(PDF) 4 Page - Lattice Semiconductor |
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LC51024MC-5FN208I Datasheet(HTML) 4 Page - Lattice Semiconductor |
4 / 92 page Lattice Semiconductor ispXPLD 5000MX Family Data Sheet 4 Cascading For Wide Operation In several modes it is possible to cascade adjacent MFBs to support wider operation. Table 2 details the different cascading options. There are chains of MFBs in each device which determine those MFBs that are adjacent for the purposes of cascading. Table 3 indicates these chains. The ispXPLD 5000MX design tools automatically cascade blocks if required by a particular design. Table 2. Cascading Modes For Wide Support Table 3. MFB Cascade Chain SuperWIDE Logic Mode In logic mode, each MFB contains 32 macrocells and a fully populated, programmable AND-array with 160 logic product terms and four control product terms. The MFB has 68 inputs from the Global Routing Pool, which are available in both true and complement form for every product term. It is also possible to cascade adjacent MFBs to create a block with 136 inputs. The four control product terms are used for shared reset, clock, clock enable, and output enable functions. Figure 3 shows the overall structure of the MFB in logic mode while Figure 4 provides a more detailed view from the perspective of a macrocell slice. Mode Cascading Function Logic Input Width. Allows two MFBs to act as a 136-input block. Arithmetic. Allow the carry chain to pass between two MFBs. FIFO Memory Width Expansion. Allows MFBs to be cascaded for greater width support. CAM Memory Width Expansion. Allows up to four MFBs to be cascaded for greater width support. Device MFBs in Cascade Chain ispXPLD 5256MX A → B → C → D H -> G -> F -> E ispXPLD 5512MX A → B → C → D → E → F → G → H P → Ο → N → M → L → K → J → I ispXPLD 5768MX D → C → B → A → X → W → V → U → T → S → R → Q E → F → G → H → I → J → K → L → M → N → O → P ispXPLD 51024MX H → G → F → E → D → C → B → A → AF → AE → AD → AC → AB → AA → Z → Y I → J → K → L → M → N → O → P → Q → R → S → T → U → V → W → X |
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