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  • Reset and register initial value. Chicken and egg? : r FPGA
    Xilinx absolutely supports using initial values in HDL to set the post-configuration initial values of the flip-flops They have been pretty clear for decades on the suggestion to use initial values instead of using asynchronous resets Lattice and Microchip do not You must code an explicit reset if you want your flip-flops to have an initial
  • difference between using reset logic vs initial values on signals
    Some FPGA technologies, for example Altera partial reconfiguration, does not support initial values for the modules used in partial reconfiguration Reuse of modules is therefore easier if only reset is used Simulation of different start restart conditions is easier when it is possible to apply reset, and continue the same simulation sequence
  • S R Flip-Flop with Set Reset - SIMPLIS
    Editing the S R Flip-Flop with Set Reset To configure the S R Flip-Flop with Set Reset, follow these steps: Double click the symbol on the schematic to open the editing dialog to the Parameters tab Make the appropriate changes to the fields described in the table below the image
  • AN 917: Reset Design Techniques for Intel® Hyperflex . . .
    The flip-flop then goes to an unknown state that can cause unexpected results upon entering normal operation You can insert a synchronously de-asserted reset circuit to prevent this condition Synchronization of the reset signal on a specific clock domain requires a minimum of two flops Figure 1 on page 5 shows the first flip-flop (FF1) with
  • Resets and Reset Domain Crossings in ASIC and FPGA designs
    The disadvantages of synchronous resets include: Synchronous resets add extra logic to the datapath between flip-flops This may impact timing and could be undesirable in high-speed designs For multiple-clock designs, synchronous resets have to be re-synchronized for each clock domain
  • How to add reset functionality to a master-slave D-type flip . . .
    I'm trying to implement a shift register and therefore need values to be stored on the downwards edge of the clock signal (otherwise the whole register just sets to the input), so I am using a master-slave D-type flip-flop to store each bit
  • Assign a synthesizable initial value to a reg in Verilog
    When a chip gets power all of it's registers contain random values It's not possible to have an an initial value It will always be random This is why we have reset signals, to reset registers to a known value The reset is controlled by something off chip, and we write our code to use it


















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