![]() In the first case, the incoming signals is recorded by two registers that then feeds each of the respective output busses. Since at the RTL level the implementations are clearly different. ![]() And while Vivado (and most other FPGA synthesis tools) recognized that the two designs are the same we should not take this for granted. Wich for clocked designs is a good thing but for signals that needs an instantaneous transmission, this is a failing in tradeoff. What this design lacks in clock support it gains in resource saving and instantaneous interchange of the input signal to output signalsįor the two synchronous cases the incoming signal is buffered by a register set, therefore any signal on the bus will not be present on the output buses for at least one clock cycle. This, therefore, does not have any synchronicity to a clock and is the HDL equivalent of taping the wires of the incoming bus to create a copy of the signal. In the asynchronous case, it can be seen in the RTL that incoming Bus is passed through a buffer and then the Bus is then junctioned to two outputs. ![]() 7 Cyclic Shift Register Johnson Counter.3 Parallel-In Parallel-Out (PIPO) Shift Register.
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