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A binary counter can represent 2 N states, where N is the number of bits in the code, whereas a straight ring counter can represent only N states and a Johnson counter can represent only 2N states. This may be an important consideration in hardware implementations where registers are more expensive than combinational logic.
Decade counter – modulus ten counter (counts through ten states). Up/down counter – counts up and down, as directed by a control input, or by the use of separate "up" and "down" clocks. Ring counter – formed by a "circular" shift register. Johnson counter – a twisted ring counter. Gray-code counter – outputs a sequence of Gray codes.
VHDL source for a signed adder. VHDL (VHSIC Hardware Description Language) is a hardware description language that can model the behavior and structure of digital systems at multiple levels of abstraction, ranging from the system level down to that of logic gates, for design entry, documentation, and verification purposes.
5-stage ÷10 Johnson counter 16 CD74HC4017: 74x4020 1 14-stage binary counter 16 SN74HC4020: 74x4022 1 4-stage ÷8 Johnson counter 14 SN74HC4022: 74x4024 1 7-stage ripple carry binary counter 14 CD74HC4024: 74x4028 1 BCD to decimal decoder 16 TC74HC4028P: 74x4040 1
The last register's complemented output is fed back to the first register's input. The output signal is derived from one or more of the register outputs. For example, a divide-by-6 divider can be constructed with a 3-register Johnson counter. The six valid values of the counter are 000, 100, 110, 111, 011, and 001.
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VHDL-1987,-1993,-2002,-2008, V2001, SV2005, SV2009, SV2012, SV2017: The original Modeltech (VHDL) simulator was the first mixed-language simulator capable of simulating VHDL and Verilog design entities together. In 2003, ModelSim 5.8 was the first simulator to begin supporting features of the Accellera SystemVerilog 3.0 standard. [1]
English: 4-bit Johnson counter using four D-Type Flip Flops. Synchronous Clock and Reset line shown. Synchronous Clock and Reset line shown. Русский: 4-х битовый счётчик, работающий в коде Джонсона, реализованный на D-триггерах.