Data-processing system
View Patent ↗A data-processing system comprises a microprocessor, a communication device communicating with an electronic module intended to apply a convention signal to the microprocessor, and a hardware circuit allowing inversion or no inversion of the order of bits of a word as a function of the value of the convention signal during transfer of the word between the electronic module and the microprocessor. Such a system allows a time gain during the operation of converting the bits of a word as a function of the convention used, which is beneficial for the real-time constraint. The system concerned may be used, for example, in a terminal using one or more cards of the SIM type, such as a mobile phone.
1. A data-processing system, comprising:
a microprocessor [PRC];
a communication device [COM] communicating with an electronic module [MOD] intended to send a convention signal to said microprocessor; and
a hardware circuit [HARD] allowing an inversion of an order of bits of a word as a function of a value of the convention signal during a transfer of the word between said electronic module [MOD] and said microprocessor [PRC].
2. The data-processing system as claimed in claim 1 , wherein said electronic module [MOD] is a Subscriber Identity Module card.
3. The data-processing system as claimed in claim 1 , wherein said hardware circuit [HARD] allows inversion of the value of the bits of the word as a function of the value of the convention signal.
4. The data-processing system as claimed in claim 1 , wherein said hardware circuit [HARD] includes
a switch [SWHMP, SWHPM];
a right shift register [RXMP, RYPM] electrically connected to said switch; and
a left shift register [RYMP, RXPM] electrically connected to said switch.
5. A terminal, comprising;
a microprocessor [PRC];
a communication device [COM] communicating with an electronic module [MOD] intended to send a convention signal to said microprocessor; and
a hardware circuit [HARD] allowing an inversion of an order of bits of a word as a function of a value of the convention signal during a transfer of the word between said electronic module [MOD] and said microprocessor [PRC].
6. The terminal as claimed in claim 5 , wherein said electronic module [MOD] is a Subscriber Identity Module card.
7. The terminal as claimed in claim 5 , wherein said hardware circuit [HARD] allows inversion of the value of the bits of the word as a function of the value of the convention signal.
8. The terminals as claimed in claim 5 , wherein said hardware circuit [HARD] includes:
a switch [SWHMP, SWHPM];
a right shift register [RXMP, RYPM] electrically connected to said switch; and
a left shift register [RYMP, RXPM] electrically connected to said switch.
9. A data-processing system, comprising:
a hardware circuit [HARD];
a communication device [COM] for communicating a convention signal and a word to said hardware circuit [HARD] from one of a microprocessor [PRC] and an electronic module [MOD]; and
wherein said hardware circuit includes means for implementing one of a direct convention and an indirect convention of an order of bits of the word as a function of a value of the convention signal.