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M4A3-384/160-10YI Datasheet(PDF) 7 Page - Lattice Semiconductor |
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M4A3-384/160-10YI Datasheet(HTML) 7 Page - Lattice Semiconductor |
7 / 62 page ispMACH 4A Family 7 Product-Term Array The product-term array consists of a number of product terms that form the basis of the logic being implemented. The inputs to the AND gates come from the central switch matrix (Table 5), and are provided in both true and complement forms for efficient logic implementation. Logic Allocator Within the logic allocator, product terms are allocated to macrocells in “product term clusters.” The availability and distribution of product term clusters are automatically considered by the software as it fits functions within a PAL block. The size of a product term cluster has been optimized to provide high utilization of product terms, making complex functions using many product terms possible. Yet when few product terms are used, there will be a minimal number of unused—or wasted—product terms left over. The product term clusters available to each macrocell within a PAL block are shown in Tables 6 and 7. Each product term cluster is associated with a macrocell. The size of a cluster depends on the configuration of the associated macrocell. When the macrocell is used in synchronous mode (Figure 2a), the basic cluster has 4 product terms. When the associated macrocell is used in asynchronous mode (Figure 2b), the cluster has 2 product terms. Note that if the product term cluster is routed to a different macrocell, the allocator configuration is not determined by the mode of the macrocell actually being driven. The configuration is always set by the mode of the macrocell that the cluster will drive if not routed away, regardless of the actual routing. In addition, there is an extra product term that can either join the basic cluster to give an extended cluster, or drive the second input of an exclusive-OR gate in the signal path. If included with the basic cluster, this provides for up to 20 product terms on a synchronous function that uses four extended 5-product-term clusters. A similar asynchronous function can have up to 18 product terms. When the extra product term is used to extend the cluster, the value of the second XOR input can be programmed as a 0 or a 1, giving polarity control. The possible configurations of the logic allocator are shown in Figures 3 and 4. Table 5. PAL Block Inputs Device Number of Inputs to PAL Block M4A3-32/32 and M4A5-32/32 M4A3-64/32 and M4A5-64/32 M4A3-64/64 M4A3-96/48 and M4A5-96/48 M4A3-128/64 and M4A5-128/64 33 33 33 33 33 M4A3-192/96 and M4A5-192/96 M4A3-256/128 and M4A5-256/128 34 34 M4A3-256/160 and M4A3-256/192 M4A3-384 M4A3-512 36 36 36 |
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