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EPM7256AE 数据表(PDF) 8 Page - Altera Corporation |
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EPM7256AE 数据表(HTML) 8 Page - Altera Corporation |
8 / 64 page 8 Altera Corporation MAX 7000A Programmable Logic Device Data Sheet Macrocells MAX 7000A macrocells can be individually configured for either sequential or combinatorial logic operation. The macrocells consist of three functional blocks: the logic array, the product-term select matrix, and the programmable register. Figure 2 shows a MAX 7000A macrocell. Figure 2. MAX 7000A Macrocell Combinatorial logic is implemented in the logic array, which provides five product terms per macrocell. The product-term select matrix allocates these product terms for use as either primary logic inputs (to the OR and XOR gates) to implement combinatorial functions, or as secondary inputs to the macrocell’s register preset, clock, and clock enable control functions. Two kinds of expander product terms (“expanders”) are available to supplement macrocell logic resources: ■ Shareable expanders, which are inverted product terms that are fed back into the logic array ■ Parallel expanders, which are product terms borrowed from adjacent macrocells The Altera development system automatically optimizes product-term allocation according to the logic requirements of the design. Product- Term Select Matrix 36 Signals from PIA 16 Expander Product Terms LAB Local Array Parallel Logic Expanders (from other macrocells) Shared Logic Expanders Clear Select Global Clear Global Clocks Clock/ Enable Select 2 PRN CLRN D/T Q ENA Register Bypass To I/O Control Block From I/O pin To PIA Programmable Register Fast Input Select VCC |
类似零件编号 - EPM7256AE |
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类似说明 - EPM7256AE |
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