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P1AFS600-PQ256ES Datasheet(PDF) 28 Page - Microsemi Corporation |
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P1AFS600-PQ256ES Datasheet(HTML) 28 Page - Microsemi Corporation |
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28 / 334 page  Device Architecture 2-12 Revision 4 Global Resources (VersaNets) Fusion devices offer powerful and flexible control of circuit timing through the use of analog circuitry. Each chip has six CCCs. The west CCC also contains a PLL core. In the two larger devices (AFS600 and AFS1500), the west and the east CCCs each contain a PLL. The PLLs include delay lines, a phase shifter (0°, 90°, 180°, 270°), and clock multipliers/dividers. Each CCC has all the circuitry needed for the selection and interconnection of inputs to the VersaNet global network. The east and west CCCs each have access to three VersaNet global lines on each side of the chip (six lines total). The CCCs at the four corners each have access to three quadrant global lines on each quadrant of the chip. Advantages of the VersaNet Approach One of the architectural benefits of Fusion is the set of powerful and low-delay VersaNet global networks. Fusion offers six chip (main) global networks that are distributed from the center of the FPGA array (Figure 2-11). In addition, Fusion devices have three regional globals (quadrant globals) in each of the four chip quadrants. Each core VersaTile has access to nine global network resources: three quadrant and six chip (main) global networks. There are a total of 18 global networks on the device. Each of these networks contains spines and ribs that reach all VersaTiles in all quadrants (Figure 2-12 on page 2-13). This flexible VersaNet global network architecture allows users to map up to 180 different internal/external clocks in a Fusion device. Details on the VersaNet networks are given in Table 2-4 on page 2-13. The flexibility of the Fusion VersaNet global network allows the designer to address several design requirements. User applications that are clock-resource-intensive can easily route external or gated internal clocks using VersaNet global routing networks. Designers can also drastically reduce delay penalties and minimize resource usage by mapping critical, high-fanout nets to the VersaNet global network. Figure 2-11 • Overview of Fusion VersaNet Global Network Main (chip) Global Network Top Spine Bottom Spine Pad Ring Chip (main) Global Pads Global Pads High-Performance VersaNet Global Network Global Spine Global Ribs Spine-Selection Tree MUX Quadrant Global Pads |
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