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OR3T20 Datasheet(PDF) 31 Page - Agere Systems |
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OR3T20 Datasheet(HTML) 31 Page - Agere Systems |
31 / 210 page Lucent Technologies Inc. 31 Data Sheet June 1999 ORCA Series 3C and 3T FPGAs Programmable Logic Cells (continued) Inter-PLC Routing Resources The inter-PLC routing is used to route signals between PLCs. The routing segments occur in groups of ten, and differ in the numbers of PLCs spanned. The x1 routing segments span one PLC, the x5 routing seg- ments span five PLCs, the xH routing segments span one-half the width (height) of the PLC array, and the xL routing segments span the width (height) of the PLC array. All types of routing segments run in both horizon- tal and vertical directions. Table 8 shows the groups of inter-PLC routing seg- ments in each PLC. In the table, there are two rows/col- umns for x1 lines. They are differentiated by a T for top, B for bottom, L for left, and R for right. In the ORCA Foundry design editor representation, the horizontal x1 routing segments are located above and below the PFU. The two groups of vertical segments are located on the left side of the PFU. The xL and x5 routing seg- ments only run below and to the left of the PFU, while the xH segments only run above and to the right of the PFU. The indexes specify individual routing segments within a group. For example, the vx5[2] segment runs vertically to the left of the PFU, spans five PLCs, and is the third line in the 10-bit wide group. PLCs are arranged like tiles on the ORCA device. Breaks in routing occur at the middle of the tile (e.g., x1 lines break in the middle of each PLC) and run across tiles until the next break. Figure 20 provides a global view of inter-PLC routing resources across multiple PLCs. x1 Routing Segments. There are a total of 40 x1 rout- ing segments per PLC: 20 vertical and 20 horizontal. Each of these are subdivided into two, 10-bit wide buses: hx1T[9:0], hx1B[9:0], vx1L[9:0], and vx1R[9:0]. An x1 segment is one PLC long. If a signal net is longer than one PLC, an x1 segment can be lengthened to n times its length by turning on n – 1 CIPs. A signal is routed onto an x1 route segment via the switching rout- ing segments or BIDI routing segments which also allows the x1 route segment to be connected to other inter-PLC segments of different lengths. Corner turning between x1 segments is provided through direct con- nections, xSW segments, and xBID segments. x5 Routing Segments. There are two sets of ten x5 routing segments per PLC. One set (vx5[9:0]) runs ver- tically, and the other (hx5[9:0]) runs horizontally. Each x5 segment traverses five PLCs before it is broken by a CIP. Two x5 segments in each group break in each PLC. The two that break are in an equivalent pair; for example, x5[0] and x5[4]. The x5 segments that break shift by one at the next PLC. For example, if hx5[0] and hx5[4] are broken at the current PLC, hx5[1] and hx5[5] will be broken at the PLC to the right of the current PLC. There are direct connections to the BIDI routing segments in the PLC at which the x5 segments break, on both sides of the break. Signal corner turning is enabled by CIPs in each PLC that allow the broken x5 segments to directly connect to the broken x5 seg- ments that run in the orthogonal direction. x5 corner turning can also be accomplished via the xSW and xBID segments in a PLC. In addition, the x5 segments are connected to the FINS and PFU outputs on a bit- by-bit basis by the xSW segments. x5 segments can be connected for signal runs in multiples of five PLCs, or they can be combined with x1 and xH routing segments for runs of varying distances. Table 8. Inter-PLC Routing Resources Horizontal Routing Segments Vertical Routing Segments Distance Spanned hx1U[9:0] vx1R[9:0] One PLC hx1B[9:0] vx1L[9:0] One PLC hx5[9:0] vx5[9:0] Five PLCs hx5[9:0] vx5[9:0] Five PLCs hxL[9:0] vxL[9:0] PLC Array hxH[9:0] vxH[9:0] 1/2 PLC Array hCLK vCLK PLC Array |
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