Counting circuit, semiconductor memory, and counting method

A counting circuit, comprising a first decoding circuit and a first counting circuit, wherein the first decoding circuit is connected with the first counting circuit;

• the first decoding circuit is configured to receive a first mode signal, and decode the first mode signal to generate a decoded signal;
• and
• the first counting circuit comprises at least one counting sub-circuit, and is configured to:
• determine, according to the decoded signal, a selected target counting circuit from the at least one counting sub-circuit, receive a counting signal, count the counting signal through the target counting circuit, and output a first counting pulse signal every time when a counting value corresponding to the counting signal reaches an integer multiple of a counting threshold;
• wherein the decoded signal comprises N-bits decoded sub-signals, wherein Nis an integer greater than 0;
• and
• the first decoding circuit is further configured to:
• during a generation of the decoded signal, in a case that a level value of an i-th-bit decoded sub-signal is a first value, determine that all level values of other-bits decoded sub-signals other than the i-th-bit decoded sub-signal are a second value, wherein the first value is different from the second value, different values of i correspond to different decoded signals, different decoded signals represent different counting thresholds, and i is an integer greater than 0 and less than or equal to N;
• wherein a number of the at least one counting sub-circuit is N, and the at least one counting sub-circuit is cascaded;
• there is a correspondence relationship between an i-th counting sub-circuit and the i-th-bit decoded sub-signal;
• and
• the first counting circuit is configured to:
• when the level value of the i-th-bit decoded sub-signal is the first value, determine that the i-th counting sub-circuit to an Nth counting sub-circuit are target counting circuits;
• and count the counting signal through the i-th counting sub-circuit to the Nth counting sub-circuit, and output the first counting pulse signal.