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ISPMACH4ACPLDFAMILY Datasheet(PDF) 9 Page - Lattice Semiconductor |
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ISPMACH4ACPLDFAMILY Datasheet(HTML) 9 Page - Lattice Semiconductor |
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9 / 62 page  ispMACH 4A Family 9 Note that the configuration of the logic allocator has absolutely no impact on the speed of the signal. All configurations have the same delay. This means that designers do not have to decide between optimizing resources or speed; both can be optimized. If not used in the cluster, the extra product term can act in conjunction with the basic cluster to provide XOR logic for such functions as data comparison, or it can work with the D-,T-type flip- flop to provide for J-K, and S-R register operation. In addition, if the basic cluster is routed to another macrocell, the extra product term is still available for logic. In this case, the first XOR input will be a logic 0. This circuit has the flexibility to route product terms elsewhere without giving up the use of the macrocell. Product term clusters do not “wrap” around a PAL block. This means that the macrocells at the ends of the block have fewer product terms available. 0 17466G-007 Figure 3. Logic Allocator Configurations: Synchronous Mode a. Basic cluster with XOR b. Extended cluster, active high c. Extended cluster, active low d. Basic cluster routed away; single-product-term, active high e. Extended cluster routed away 0 17466G-008 Figure 4. Logic Allocator Configurations: Asynchronous Mode b. Extended cluster, active high c. Extended cluster, active low e. Extended cluster routed away d. Basic cluster routed away; single-product-term, active high a. Basic cluster with XOR |
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