On a positive clock edge, ff0 will capture its input and ff1 will capture the current value of ff0. The input to ff1 is the output of ff0, which is also the current value of ff0. ![]() The input to ff0 is the input to the shift register. Consider the flip flops labeled 0 and 1 in Figure 1 (ff0 and ff1). ![]() Let’s say we are using positive edge-triggered flip flops. The storage elements are controlled by a common clock signal: In its simplest form, a shift register consists of a number of storage elements (e.g., flip flops) connected in series, so that the output of one storage element feeds into the input of the next. Verilog Shift Register Basic Concepts/Characteristics The register described can be synthesized and downloaded to an FPGA for test in actual hardware. ![]() This article will discuss how to implement a shift register in Verilog.
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