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EPLD Datasheet(PDF) 34 Page - Altera Corporation |
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EPLD Datasheet(HTML) 34 Page - Altera Corporation |
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34 / 42 page ![]() 778 Altera Corporation Classic EPLD Family Data Sheet General Description Altera EP1810 devices offer LSI density, TTL-equivalent speed, and low- power consumption. EP1810 devices have 48 macrocells, 16 dedicated input pins, and 48 I/O pins (see Figure 16). EP1810 devices are divided into four quadrants, each containing 12 macrocells. Of the 12 macrocells in each quadrant, 8 have quadrant feedback and are “local” macrocells (see “Feedback Select” on page 749 of this data sheet for more information). The remaining 4 macrocells in the quadrant are “global” macrocells. Both local and global macrocells can access signals from the global bus, which consists of the true and complement forms of the dedicated inputs and the true and complement forms of the feedbacks from the global macrocells. EP1810 devices also have four dedicated inputs (one in each quadrant) that can be used as quadrant clock inputs. If the dedicated input is used as a clock pin, the input feeds the clock input of all registers in that particular quadrant. |
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