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EP2C35A15F324C6N Datasheet(PDF) 22 Page - Altera Corporation |
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EP2C35A15F324C6N Datasheet(HTML) 22 Page - Altera Corporation |
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22 / 168 page  2–10 Altera Corporation Cyclone II Device Handbook, Volume 1 February 2007 MultiTrack Interconnect A LAB-wide asynchronous load signal to control the logic for the register’s preset signal is not available. The register preset is achieved by using a NOT gate push-back technique. Cyclone II devices can only support either a preset or asynchronous clear signal. In addition to the clear port, Cyclone II devices provide a chip-wide reset pin (DEV_CLRn) that resets all registers in the device. An option set before compilation in the Quartus II software controls this pin. This chip-wide reset overrides all other control signals. MultiTrack Interconnect In the Cyclone II architecture, connections between LEs, M4K memory blocks, embedded multipliers, and device I/O pins are provided by the MultiTrack interconnect structure with DirectDrive™ technology. The MultiTrack interconnect consists of continuous, performance-optimized routing lines of different speeds used for inter- and intra-design block connectivity. The Quartus II Compiler automatically places critical paths on faster interconnects to improve design performance. DirectDrive technology is a deterministic routing technology that ensures identical routing resource usage for any function regardless of placement within the device. The MultiTrack interconnect and DirectDrive technology simplify the integration stage of block-based designing by eliminating the re-optimization cycles that typically follow design changes and additions. The MultiTrack interconnect consists of row (direct link, R4, and R24) and column (register chain, C4, and C16) interconnects that span fixed distances. A routing structure with fixed-length resources for all devices allows predictable and repeatable performance when migrating through different device densities. Row Interconnects Dedicated row interconnects route signals to and from LABs, PLLs, M4K memory blocks, and embedded multipliers within the same row. These row resources include: ■ Direct link interconnects between LABs and adjacent blocks ■ R4 interconnects traversing four blocks to the right or left ■ R24 interconnects for high-speed access across the length of the device |
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