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EPM9560 数据表(PDF) 10 Page - Altera Corporation |
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EPM9560 数据表(HTML) 10 Page - Altera Corporation |
10 / 46 page 10 Altera Corporation MAX 9000 Programmable Logic Device Family Data Sheet Expander Product Terms Although most logic functions can be implemented with the five product terms available in each macrocell, some logic functions are more complex and require additional product terms. Although another macrocell can supply the required logic resources, the MAX 9000 architecture also offers both shareable and parallel expander product terms that provide additional product terms directly to any macrocell in the same LAB. These expanders help ensure that logic is synthesized with the fewest possible logic resources to obtain the fastest possible speed. Shareable Expanders Each LAB has 16 shareable expanders that can be viewed as a pool of uncommitted single product terms (one from each macrocell) with inverted outputs that feed back into the LAB local array. Each shareable expander can be used and shared by any or all macrocells in the LAB to build complex logic functions. A small delay (tLOCAL + tSEXP) is incurred when shareable expanders are used. Figure 4 shows how shareable expanders can feed multiple macrocells. Figure 4. MAX 9000 Shareable Expanders Macrocell Product-Term Logic Product-Term Select Matrix Macrocell Product-Term Logic LAB Local Array 16 Local Feedbacks 16 Shared Expanders 33 Row FastTrack Interconnect Signals Shareable expanders can be shared by any or all macrocells in the LAB. |
类似零件编号 - EPM9560 |
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类似说明 - EPM9560 |
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