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LC4384B-75F256I1 Datasheet(PDF) 6 Page - Lattice Semiconductor |
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LC4384B-75F256I1 Datasheet(HTML) 6 Page - Lattice Semiconductor |
6 / 99 page Lattice Semiconductor ispMACH 4000V/B/C/Z Family Data Sheet 6 Product Term Allocator The product term allocator assigns product terms from a cluster to either logic or control applications as required by the design being implemented. Product terms that are used as logic are steered into a 5-input OR gate associ- ated with the cluster. Product terms that used for control are steered either to the macrocell or I/O cell associated with the cluster. Table 3 shows the available functions for each of the five product terms in the cluster. The OR gate output connects to the associated I/O cell, providing a fast path for narrow combinatorial functions, and to the logic allocator. Table 3. Individual PT Steering Cluster Allocator The cluster allocator allows clusters to be steered to neighboring macrocells, thus allowing the creation of functions with more product terms. Table 4 shows which clusters can be steered to which macrocells. Used in this manner, the cluster allocator can be used to form functions of up to 20 product terms. Additionally, the cluster allocator accepts inputs from the wide steering logic. Using these inputs, functions up to 80 product terms can be created. Table 4. Available Clusters for Each Macrocell Wide Steering Logic The wide steering logic allows the output of the cluster allocator n to be connected to the input of the cluster alloca- tor n+4. Thus, cluster chains can be formed with up to 80 product terms, supporting wide product term functions and allowing performance to be increased through a single GLB implementation. Table 5 shows the product term chains. Product Term Logic Control PT n Logic PT Single PT for XOR/OR PT n+1 Logic PT Individual Clock (PT Clock) PT n+2 Logic PT Individual Initialization or Individual Clock Enable (PT Initialization/CE) PT n+3 Logic PT Individual Initialization (PT Initialization) PT n+4 Logic PT Individual OE (PTOE) Macrocell Available Clusters M0 — C0C1C2 M1 C0 C1 C2 C3 M2 C1 C2 C3 C4 M3 C2 C3 C4 C5 M4 C3 C4 C5 C6 M5 C4 C5 C6 C7 M6 C5 C6 C7 C8 M7 C6 C7 C8 C9 M8 C7 C8 C9 C10 M9 C8 C9 C10 C11 M10 C9 C10 C11 C12 M11 C10 C11 C12 C13 M12 C11 C12 C13 C14 M13 C12 C13 C14 C15 M14 C13 C14 C15 — M15 C14 C15 — — |
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