Semiconductor integrated circuit
View Patent ↗The semiconductor integrated circuit includes: a plurality of macro cells; and a serial-parallel conversion circuit for converting a serial signal inputted from outside to generate parallel selection control signals during testing, or an A/D conversion circuit for converting an analog signal inputted from outside to generate digital selection control signals during testing. One or more among, the plurality of macro cells are selected based on the selection control signals and brought to a test operation state.
1. A semiconductor integrated circuit comprising:
a plurality of macro cells; and
a serial-parallel conversion circuit for parallel-converting a serial signal inputted from outside to generate parallel selection control signals having N bits,
wherein one or more among the plurality of macro cells are selected based on M bits out of the N bits of the selection control signals, and
wherein N>1 and M<N; and
the semiconductor integrated circuit further comprises a first decode circuit for decoding bits other than the M bits of the selection control signals, and a selector for selecting one of output signals from the plurality of macro cells based on the decoded result of the first decode circuit.
2. The semiconductor integrated circuit of claim 1 , further comprising a second decode circuit for decoding the M bits out of the N bits of the selection control signals,
wherein the selection of one or more among the plurality of macro cells is made based on the decoded result of the second decode circuit.
3. The semiconductor integrated circuit of claim 1 , wherein the selected macro cell output signal is outputted outside the semiconductor integrated circuit.
4. The semiconductor integrated circuit of claim 3 , wherein a same terminal is used as a terminal via which the serial signal and as a terminal via which the macro cell output signal is outputted outside the semiconductor integrated circuit.
5. The semiconductor integrated circuit of claim 1 , wherein the M bits out of the N bits of the selection control signals include timing control information indicating operation timing for selected macro cells, and
the timing for bringing the macro cells to the test operation state is controlled based on the timing control information.
6. The semiconductor integrated circuit of claim 1 , wherein the serial signal or the analog signal is captured when a predetermined reset signal is in a first level, and
macro cells corresponding to the M bits out of the N bits of the selection control signals are brought to the test operation state when the reset signal is in a second level.
7. The semiconductor integrated circuit of claim 1 , wherein at least one of the plurality of macro cells constitutes a memory.
8. A semiconductor integrated circuit comprising:
a plurality of macro cells; and
an A/D conversion circuit for A/D-convening an analog signal inputted from outside to generate digital selection control signals having N bits,
wherein one or more among the plurality of macro cells are selected based on M bits out of the N bits of the selection control signals, and
wherein N>1 and M<N; and
the semiconductor integrated circuit further comprises a first decode circuit for decoding bits other than the M bits out of the N bits of the selection control signals, and a selector for selecting one of output signal from the plurality of macro cells based on the decoded result of the first decode circuit.