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A gated SR latch circuit diagram constructed from AND gates (on left) and NOR gates (on right) A gated SR latch can be made by adding a second level of NAND gates to an inverted SR latch. The extra NAND gates further invert the inputs so a SR latch becomes a gated SR latch (a SR latch would transform into a gated SR latch with inverted enable).
A simple example of metastability can be found in an SR NOR latch, when both Set and Reset inputs are true (R=1 and S=1) and then both transition to false (R=0 and S=0) at about the same time. Both outputs Q and Q are initially held at 0 by the simultaneous Set and Reset inputs.
Gate-level Diagram of a NAND-gate SR Flip-flop: Date: 17 June 2006: Source: Own Drawing in Inkscape 0.43: Author: jjbeard: Permission (Reusing this file) PD: Other versions: Unified series of flip-flop symbols
In order to complete the excitation table of a flip-flop, one needs to draw the Q(t) and Q(t + 1) for all possible cases (e.g., 00, 01, 10, and 11), and then make the value of flip-flop such that on giving this value, one shall receive the input as Q(t + 1) as desired.
English: Gate-level Diagram of a Inverted SR Flip-flop. Date: Modified:Sep. 23, 2009 Original:17/06/06: Source: ... Inverted SR Asynchronous latch. SR latch with enable.
Gate-level Diagram of a Clocked NAND-gate SR Flip-flop: Date: 17 June 2006: Source: Own Drawing in Inkscape 0.43: Author: Inductiveload: ... Latch; Usage on ja ...
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"A synchronous SR latch (sometimes clocked SR flip-flop) can be made by adding a second level of NAND gates to the inverted SR latch (or a second level of NOR gates to the direct SR latch)." The description does not match the circuit shown below. There are no NAND gates anywhere. A gated SR latch circuit diagram constructed from NOR gates.