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LC5256MB-52Q672I データシート(PDF) 7 Page - Lattice Semiconductor |
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LC5256MB-52Q672I データシート(HTML) 7 Page - Lattice Semiconductor |
7 / 92 page Lattice Semiconductor ispXPLD 5000MX Family Data Sheet 7 Figure 6. Dual-OR PT Sharing Array Product Term Sharing Array The Product Term Sharing Array (PTSA) consists of 32 inputs from the Dual-OR Array (Expandable PTSA OR) and 32 outputs directly to the macrocells. Each output is the OR term of any combination of the seven Expandable PTSA OR terms connected to that output. Every Nth macrocell is connected to N-3, N-2, N-1, N, N+1, N+2 and N+3 PTSA OR terms via a programmable connection. This wraps around the logic, for example, Macrocell 0 gets its logic from 29, 30, 31, 0, 1, 2, 3. The Expandable PTSA OR used in conjunction with the PTSA allows wide func- tions to be implemented easily and efficiently. Without using the Expandable PTSA OR capability, the greatest number of product terms that can be included in a single function with one pass of delay is 35. Up to 160 product terms can be included in a single function through the use of the expandable PTSA OR capability. Figure 7 shows the graphical representation of the PTSA. Figure 7. Product Term Sharing Array (PTSA) From n-7 Carry In Carry Out To n+7 From PT0 From PT1 From PT2 From PT3 From PT4 PTSA Bypass To Macrocell To I/O Block To Macrocell To Macrocell To Macrocell To PTSA PT OE PT Clock PT Preset PT Reset N PTSA OR 0 PTSA OR 1 PTSA OR 2 PTSA OR 3 PTSA OR 29 PTSA OR 30 PTSA OR 31 Macrocell 0 Macrocell 1 Macrocell 2 Macrocell 29 Macrocell 30 Macrocell 31 |
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