Output logic

Consider a logic gate with 3-iiiput and 3-output lines. Edward Fredkin, motivated by a deep conviction in a fundamental connection between a discrete, finite physics and reversible computation [wrightSS], discovered a simple universal 3-input/ 3-output logic function that now bears his name [fredkin82]. 

AND gate 4 differs from 3 in several aspects of performance and design. Experimentally, 4 produces a virtually perfect truth table The output logic 1 state has a fluorescence quantum yield (< >f) of 0.22 and the three logic 0 states do not rise above a cj>f value of 0.009. A fluorescence enhancement (FE) factor exceeding an order of magnitude such as this is a joy to work with since the switching phenomena are so clearly visible. 

Fig 2 shows the sequence of events of an electronic programmer system for a projectile. The projectile was equipped with a telemetry unit that transmitted the frequency of both oscillators and the outputs from both channels. The outputs occurred at T-70, T-60, T-40 and T-00 secs. The purpose of the test was primarily to determine if the decade dividers, output logic, and firing circuit would operate... 

In a Moore finite state machine, the output of the circuit is dependent only on the state of the machine and not on its inputs. This is described i pictorially in Figure 3-5. Since the outputs are dependent only on the j state, a good way to describe a Moore machine is to use an always state- j ment with a case statement. The case statement is used to switch between j the various states and the output logic for each state is described in the appropriate branch. The always statement can have the clock event in its] event list to indicate that it is a clocked always statement. This models the] condition of a finite state machine going from state to state synchronously j on every clock edge. The machine state itself is modeled using a reg vari-] able (a variable of reg data type). 

Figure 4.13 Pulse responses with the pulse height selector in the integral discriminator mode (a) Pulses from the delay-line amplifier output, (b) The output logic pulses from the pulse height selector. (Reprinted by courtesy of EG G ORTEC.)...

A second discriminator level Vu has been added to the lower-level discriminator Vl normally used in the integral mode. In the window mode the pulse height selector produces a standard output logic pulse only if the amplifier pulse amplitude... 

Fanout (1) The maximum number of similar inputs that a logic device output can drive while still meeting output logic voltage specifications. (2) The actual number of inputs connected to a particular output. Latchup A faulty operating condition of CMOS circuits in which its parasitic SCRs produce a low resistance path between power supply rails. 

The next state logic and the output logic are purely combinational while the present state consists of sequential memoiy elements (flip-flops). Each active clock transition causes a change of state from the present state to the next state. 

Subsystem A system consists of a set of subsystems. A subsystem is composite hardware and software design element, which can be composed of further subsystems or components or modules. Examples for subsystems are power supply, input, output, logic unit, software,... 

In fact, training any of the standard 2 input - 1 output logic gates (AND, OR, NAND, XOR, NOR) is very straightforward with the voltage in -current out model. Not all of them were specifically mentioned in the previous section simply because many of them are similar. NAND, NOR and XOR are very similar and AND and OR are very easy to train (they do not even require NDR). 

RC ADDER(ABUS, BBUS, SUB, RCOUT, OVERFLOW) OUTPUT LOGIC for K in IS downto 0generate... 

The number of l C channels, their functions and input-output logic, as well as information on indicators, alarms and control characteristics, including margins of safety, production and stability. 

---