Download B-52 Stratofortress: In Detail and Scale by Alwyn T. Lloyd PDF

By Alwyn T. Lloyd

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Extra resources for B-52 Stratofortress: In Detail and Scale

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This feature allows a designer to create a system in which the FPGA's program may change during operation. Readback Another powerful feature of the FPGA is readback, the ability to read out of the chip the program and also the contents of internal flip-flops, latches and memories. A working part can be stopped and its state recovered. In systems, readback is used for design verification and debugging. During manufacturing test, configuration and readback allow direct test access to observe and control internal nodes, greatly simplifying test program generation.

Experience with the XC2000 repowering buffers showed them to be difficult to use effectively. Signals should be buffered after they pass through several switchboxes, but the XC2000 architecture re-drives signals whenever they cross the grid boundary, regardless of the distance they have travelled. A signal to be connected to an adjacent CLB is buffered if it happens to fall at the edge of the grid pattern, whereas a signal that travels a long distance wholly within one of the squares of the grid will not be buffered at all.

Two of the horizontal long lines are driven by three-state buffers, distributed along the long line, one set per CLB. These buffers give users the ability to build on-chip busses. The busses allow implementation of datapaths without the wiring congestion of the wide multiplexers that would be required if three-state busses were not available. Each horizontal long line includes an optional pullup resistor to pull the long line high if none of the buffers is driving it. Configuring the three-state buffers open-drain, connecting the same signal to the input and control of the three-state buffer, and activating the pull up resistor creates a distributed wired-AND.

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