NOR

(redirected from NOR gate)
Also found in: Dictionary, Financial, Wikipedia.

NOR

[nȯr]
(mathematics)
A logic operator having the property that if P, Q, R, … are statements, then the NOR of P, Q, R, … is true if all statements are false, false if at least one statement is true. Derived from NOT-OR. Also known as Peirce stroke relationship.

NOR

Not OR.

The Boolean function which is true if none of its inputs are true and false otherwise, the logical complement of inclusive OR. The binary (two-input) NOR function can be defined (written as an infix operator):

A NOR B = NOT (A OR B) = (NOT A) AND (NOT B)

Its truth table is:

A | B | A NOR B --+---+--------- F | F | T F | T | F T | F | F T | T | F

NOR, like NAND, forms a complete set of Boolean functions on its own since it can be used to make NOT, AND, OR and any other Boolean function:

NOT A = A NOR A

A OR B = NOT (A NOR B)

A AND B = (NOT A) NOR (NOT B)

NOR

(Not OR) A Boolean logic operation that is true if all inputs are false, and false if any input is true. A NOR gate is constructed of an OR gate followed by a NOT gate.

An exclusive NOR (XNOR) is true if both inputs are the same. An XNOR is constructed of multiple NOR gates. See Boolean logic, flash memory and NAND flash.


References in periodicals archive ?
We see that the attacker designed the hardware Trojan so that the payload is triggered when the NOR gate's inputs are both zero (yellow portion of Figure 3).
For an illustration purpose, PTM for a standard NOR gate is shown in (4) where P represents the probability for incorrect output value.
This phenomenon happened because the NOR gate is a duality of the NAND gate, so their stationary behaviors, characterized by Figures 9 and 10, appear to be complementary and they share the same error bound.
Neither Manafort nor Gates have been charged in connection with their Trump campaign work.
It is not even Jobs nor Gates nor Mandela It's Nancy Slim, a 12-year-old girl who loves to read and write, believing that books bring change to people's lives and take them to places they've never seen before.
The logic synthesis can be performed using commercial tools, such as Cadence Encounter RTL or Synopsis Design Compiler, which generated mapped netlists of the modules, represented in terms of inverters, NAND gates, NOR gates and registers.
Neither Ballmer nor Gates has "veto power" over the selection of the company's next leader, this person said.
There are two categories of CMOS RS flip-flops in the simulation, CMOS RS flip-flop composed of two cross-coupled NOR gates and two cross-coupled NAND gates.
Neither Noyce nor Gates, nor any of their peers, ever resembled the classic owner-entrepreneur of a small competitive firm.
Neither John nor Gates seems ease with this flamboyant material: John's evocative analysis seems to suggest that marriage was one experience among many, while Gates claims (implausibly, I think) that Robins remained celibate thereafter, faithful to the husband she had scarcely seen.
There are lights that need to be changed but no gates at the west crossing and neither lights nor gates at the east crossing, she further added.