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OR2C04A Datasheet(PDF) 34 Page - Lattice Semiconductor |
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OR2C04A Datasheet(HTML) 34 Page - Lattice Semiconductor |
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34 / 192 page  Data Sheet ORCA Series 2 FPGAs January 2002 34 Lattice Semiconductor Interquad Routing (continued) Subquad Routing (OR2C40A/OR2T40A Only) In the ORCA OR2C40A/OR2T40A/OR2T40B, each quadrant of the device is split into smaller arrays of PLCs called subquads. Each of these subquads is made of a 4 x 4 array of PLCs (for a total of 16 per sub- quadrant), except at the outer edges of array, which have less than 16 PLCs per subquad. New routing resources, called subquad lines, have been added between each adjacent pair of subquads to enhance the routability of the device. A portion of the center of the OR2C40A and OR2T40A array is shown in Figure 30, including the subquad blocks containing a 4 x 4 array of PLCs, the interquad routing lines, and the sub- quad routing lines. All of the inter-PLC routing resources discussed previ- ously continue to be routed between a PLC and its adjacent PLC, even if the two adjacent PLCs are in dif- ferent subquad blocks. Since the PLC routing has not been modified for the OR2C40A/OR2T40A architec- tures, this means that all of the same routing connec- tions are possible for these devices as for any other ORCA 2C series device. In this way, both the OR2C40A and OR2T40A/OR2T40B are upwardly com- patible when compared with the ATT2Cxx series devices. As the inter-PLC routing runs between sub- quad blocks, it crosses the new subquad lines. When this happens, CIPs are used to connect the subquad lines to the X4 and/or the XH lines which lie along the other axis of the PLC array. 5-4200(F).r5 Figure 30. Subquad Blocks and Subquad Routing SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SUBQUAD (4 x 4 PLCs) SEE DETAIL IN FIGURES 25 AND 26 HORIZONTAL INTERQUAD ROUTING (hIQ) HORIZONTAL SUBQUAD ROUTING (HSUB) VERTICAL SUBQUAD ROUTING (VSUB) VERTICAL INTERQUAD ROUTING (vIQ) |
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Similar Description - OR2C04A |
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