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An asynchronous (ripple) counter is a "chain" of toggle (T) flip-flops in which the least-significant flip-flop (bit 0) is clocked by an external signal (the counter input clock), and all other flip-flops are clocked by the output of the nearest, less significant flip-flop (e.g., bit 0 clocks the bit 1 flip-flop, bit 1 clocks the bit 2 flip ...
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.
While 4-bit computing is mostly obsolete, 4-bit values are still used in the same decimal-centric roles they were developed for, and modern implementations are generally much wider and process multiple 4-bit values in parallel. An example of such a system is the HP Saturn design of the 1980s. By the 1990s, most such uses had been replaced by ...
A 4-bit program counter that keeps track of the current processor instruction, corresponding to a 4-bit addressable RAM. An output register that displays its content on four 7-segment displays, capable of displaying both unsigned and 2's complement signed integers.
synchronous presettable 4-bit decade counter, asynchronous clear 16 SN74LS160A: 74x161 1 synchronous presettable 4-bit binary counter, asynchronous clear 16 SN74LS161A: 74x162 1 synchronous presettable 4-bit decade counter, synchronous clear 16 SN74LS162A: 74x163 1 synchronous presettable 4-bit binary counter, synchronous clear 16 SN74LS163A ...
In computing, a linear-feedback shift register (LFSR) is a shift register whose input bit is a linear function of its previous state. The most commonly used linear function of single bits is exclusive-or (XOR). Thus, an LFSR is most often a shift register whose input bit is driven by the XOR of some bits of the overall shift register value.
The very fastest shifters are implemented as full crossbars, in a manner similar to the 4-bit shifter depicted above, only larger. These incur the least delay, with the output always a single gate delay behind the input to be shifted (after allowing the small time needed for the shift count decoder to settle; this penalty, however, is only incurred when the shift count changes).
Pages in category "4-bit computers" The following 2 pages are in this category, out of 2 total. This list may not reflect recent changes. I. Intellec; M. Micro 440