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EP220LI-12 Datasheet(PDF) 4 Page - Altera Corporation |
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EP220LI-12 Datasheet(HTML) 4 Page - Altera Corporation |
4 / 16 page 4 Altera Corporation EP220 & EP224 Classic EPLDs Macrocells Each macrocell includes a product-term block with 8 AND product terms feeding an OR gate. One product term is dedicated to the Output Enable (OE) control of the tri-state buffer. The global logic array allows each product term to connect to the true or complement of each input—36 inputs for the EP220, 44 inputs for the EP224—and I/O feedback signal. See Figure 2. Figure 2. EP220 & EP224 Macrocell Macrocells can be individually configured for registered or combinatorial operation, providing a mixed-mode operation not available in fixed- architecture PAL devices. When registered output is selected, feedback from the register to the logic array bypasses the output buffer. When combinatorial output is selected, feedback comes from the I/O pin through the output buffer, and can be used for bidirectional I/O. Unlike PAL and GAL devices, all eight outputs on the EP220 and EP224 allow a combinatorial feedback signal from the I/O pin to feed the logic array. Data is clocked into the macrocell’s D register on the rising edge of the global Clock. Feedback Select DQ CLK Inversion Control Programmable Register Output Enable Feedback to Logic Array Pin, I/O, and Macrocell Feedback |
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Similar Description - EP220LI-12 |
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