Semiconductor device and method for protecting bus

A semiconductor device comprising:

• a first set including
• a first bus master,
• a first master interface provided between the first bus master and a bus, and
• a first protocol conversion unit provided in the bus,
• wherein the first bus master outputs first data generated based on a first protocol,
• wherein the first master interface includes a first copy data generation unit for generating first copy data by copying the first data, and a first code generation unit for generating a first error detection code based on the first copy data, and a first identifier addition unit for adding a first protocol identifier representing the first protocol used in the first bus master to the first copy data,
• wherein the first protocol conversion unit generates a second data by converting the first data from the first protocol to a second protocol,
• a second set including
• a second bus master,
• a second master interface provided between the second bus master and the bus, and
• a second protocol conversion unit provided in the bus,
• wherein the second bus master outputs third data generated based on a third protocol,
• wherein the second master interface includes a second copy data generation unit for generating second copy data by copying the third data, and a second code generation unit for generating a second error detection code based on the second copy data, and a second identifier addition unit for adding a second protocol identifier representing the third protocol used in the second bus master to the second copy data, the third protocol being different from the first protocol,
• wherein the second protocol conversion unit generates fourth data by converting the third data from the third protocol to the second protocol,
• a bus slave,
• a slave interface provided between the bus slave and the bus,
• wherein the slave interface receives the second data, the first copy data, the first error detection code, and the first protocol identifier from the first protocol conversion unit, and the fourth data, the second copy data, the second error detection code, and the second protocol identifier from the second protocol conversion unit,
• wherein the slave interface includes
• an error detection unit for detecting an error of the first copy data based on the first error detection code and an error of the second copy data based on the second error detection code
• a first verification protocol conversion unit for the first protocol conversion unit, the first verification protocol conversion unit generating first verification data by converting one of the second data and the first copy data from one of the first protocol and the second protocol to another one the first protocol and the second protocol,
• a second verification protocol conversion unit for the second protocol conversion unit, the second verification protocol conversion unit generating second verification data by converting one of the fourth data and the second copy data from one of the third protocol and the second protocol to another one of the third protocol and the second protocol,
• a comparator for comparing the first verification data with third verification data that is another one of the second data and the first copy data, and comparing the second verification data with fourth verification data that is another one of the fourth data and the second copy data, and
• a selector for selecting one of the first and second verification protocol conversion units for the comparator based on the first and second protocol identifiers added to the first and second copy data by the first and second identifier addition units, respectively.