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MAX3000A Datasheet(PDF) 9 Page - Altera Corporation |
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MAX3000A Datasheet(HTML) 9 Page - Altera Corporation |
9 / 42 page Altera Corporation 9 MAX 3000A Programmable Logic Device Family Data Sheet The Altera development system compiler can automatically allocate up to three sets of up to five parallel expanders to the macrocells that require additional product terms. Each set of five parallel expanders incurs a small, incremental timing delay (tPEXP). For example, if a macrocell requires 14 product terms, the compiler uses the five dedicated product terms within the macrocell and allocates two sets of parallel expanders; the first set includes five product terms, and the second set includes four product terms, increasing the total delay by 2 × t PEXP. Two groups of eight macrocells within each LAB (e.g., macrocells 1 through 8 and 9 through 16) form two chains to lend or borrow parallel expanders. A macrocell borrows parallel expanders from lower– numbered macrocells. For example, macrocell 8 can borrow parallel expanders from macrocell 7, from macrocells 7 and 6, or from macrocells 7, 6, and 5. Within each group of eight, the lowest–numbered macrocell can only lend parallel expanders and the highest–numbered macrocell can only borrow them. Figure 4 shows how parallel expanders can be borrowed from a neighboring macrocell. Figure 4. MAX 3000A Parallel Expanders Unused product terms in a macrocell can be allocated to a neighboring macrocell. Preset Clock Clear Product- er Select Matrix Preset Clock Clear Product- Ter T T m Select Matrix Macrocell Product- Term Logic From Previous Macrocell To Next Macrocell Macrocell Product- Term Logic 36 Signals from PIA 16 Shared Expanders |
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