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A54SX32A-PQ208A Datasheet(PDF) 6 Page - Actel Corporation |
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A54SX32A-PQ208A Datasheet(HTML) 6 Page - Actel Corporation |
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6 / 68 page  1- 2 v2.2 The C-cell implements a range of combinatorial functions of up to five inputs (Figure 1-3 on page 1-3). Inclusion of the DB input and its associated inverter function allows more than 4,000 combinatorial functions to be implemented in a single module in the SX-A architecture. The inverter function improves flexibility in the architecture; for instance a 3-input exclusive-OR function can be integrated into a single C-cell. At the same time, the C-cell structure is extremely synthesis friendly, simplifying the overall design and reducing synthesis time. Two C cells can be combined together to create a flip- flop to imitate an R-cell via the user of the CC macro. This is particularly useful when implementing paths which are not timing-critical or if the designer needs more R-cells. More information about CC macro can be found in Actel's Maximizing Logic Utilization in eX, SX and SX-A FPGA Devices Using CC Macros Application Note. Chip Architecture The SX-A family’s chip architecture provides a unique approach to module organization and chip routing that delivers the best register/logic mix for a wide variety of new and emerging applications. Module Organization The C-cell and R-cell logic modules are arranged into horizontal groups called Clusters. There are two types of Clusters: Type 1 contains two C-cells and one R-cell, while Type 2 contains one C-cell and two R-cells. Clusters are further organized into SuperClusters for even better design efficiency and device performance (Figure 1-4 on page 1-4). SuperCluster 1 is a two-wide grouping of Type 1 Clusters. SuperCluster 2 is a two-wide group containing one Type 1 Cluster and one Type 2 Cluster. SX-A devices feature more SuperCluster 1 modules than SuperCluster 2 modules because designers typically require significantly more combinatorial logic than flip-flops. Note: A54SX72A has four layers of metal with the antifuse between Metal 3 and Metal 4. A54SX08A, A54SX16A, and A54SX32A have three layers of metal with antifuse between Metal 2 and Metal 3. Figure 1-1 • SX-A Family Interconnect Elements Metal 4 Metal 3 Metal 2 Metal 1 Amorphous Silicon/ Dielectric Antifuse Tungsten Plug Via Tungsten Plug Via Tungsten Plug Contact Routing Tracks Silicon Substrate |
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