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EP2C8AQ324I7ES Datasheet(PDF) 23 Page - Altera Corporation |
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EP2C8AQ324I7ES Datasheet(HTML) 23 Page - Altera Corporation |
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23 / 168 page  Altera Corporation 2–11 February 2007 Cyclone II Device Handbook, Volume 1 Cyclone II Architecture The direct link interconnect allows an LAB, M4K memory block, or embedded multiplier block to drive into the local interconnect of its left and right neighbors. Only one side of a PLL block interfaces with direct link and row interconnects. The direct link interconnect provides fast communication between adjacent LABs and/or blocks without using row interconnect resources. The R4 interconnects span four LABs, three LABs and one M4K memory block, or three LABs and one embedded multiplier to the right or left of a source LAB. These resources are used for fast row connections in a four- LAB region. Every LAB has its own set of R4 interconnects to drive either left or right. Figure 2–8 shows R4 interconnect connections from an LAB. R4 interconnects can drive and be driven by LABs, M4K memory blocks, embedded multipliers, PLLs, and row IOEs. For LAB interfacing, a primary LAB or LAB neighbor (see Figure 2–8) can drive a given R4 interconnect. For R4 interconnects that drive to the right, the primary LAB and right neighbor can drive on to the interconnect. For R4 interconnects that drive to the left, the primary LAB and its left neighbor can drive on to the interconnect. R4 interconnects can drive other R4 interconnects to extend the range of LABs they can drive. Additionally, R4 interconnects can drive R24 interconnects, C4, and C16 interconnects for connections from one row to another. Figure 2–8. R4 Interconnect Connections Notes to Figure 2–8: (1) C4 interconnects can drive R4 interconnects. (2) This pattern is repeated for every LAB in the LAB row. Primary LAB (2) R4 Interconnect Driving Left Adjacent LAB can Drive onto Another LAB's R4 Interconnect C4 Column Interconnects (1) R4 Interconnect Driving Right LAB Neighbor LAB Neighbor |
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