Patent ID: 7941866

Claim:
A semiconductor apparatus, comprising: a first to a fourth external terminals; a decoding circuit; and a power supply circuit configured to selectively activate and deactivate portions of the decoding circuit based upon first and second encoded data input to the first external terminal, wherein the semiconductor apparatus in a first mode, inputs the first encoded data from the first external terminal; decodes the first encoded data by the decoding circuit to generate a first decoded data; and outputs the first decoded data from the fourth external terminal; and the semiconductor apparatus in a second mode, inputs the second encoded data from the first external terminal; outputs the second encoded data input from the first external terminal from the second external terminal; inputs the second encoded data output from the second external terminal from the third external terminal; decodes the second encoded data input from the third external terminal by the decoding circuit to generate a second decoded data; and outputs the second decoded data from the fourth external terminal.