Interface between modem and subscriber interface module (sim)

Details Interface between modem and subscriber interface module (sim) Interface between modem and subscriber interface module (sim)

H - Electricity

04

W

H04W 92/08 (2009.01)

Patent

CA 2409816

A circuit for interfacing a modem in a wireless communication device to a Subscriber Interface Module (SIM) (122) includes a modem controller (302), a Universal Asynchronous Receiver/Transmitter (UART) (312) connected to the modem controller, a programmable clock circuit (314, 316) adapted to generate a SIM clock and a UART clock independently of one another based on a common clock (350) and a control signal (352) provided to the programmable clock circuit, a reset circuit (320) to generate a SIM reset signal, and a power control circuit (308) to control powering on and off the SIM, all on an integrated circuit chip (301). The circuit also includes a Bus Interface circuit (214) to interface the modem to the SIM using a common data line (212).

L'invention concerne un circuit servant d'interface entre un modem de dispositif de communication sans fil et un module d'interface d'abonné (SIM) (122), qui comprend : un organe de commande (302) de modem ; un émetteur-récepteur asynchrone universel (UART) (312) connecté à l'organe de commande du modem ; un circuit d'horloge (314, 316) programmable capable de produire des impulsions de synchronisation SIM et des impulsions de synchronisation UART indépendantes les unes des autres, sur la base d'une horloge commune (350) et d'un signal (352) de commande fourni au circuit d'horloge programmable ; un circuit (320) de remise à zéro pour produire un signal de remise à zéro SIM ; et un circuit (308) de réglage d'alimentation pour commander la mise sous tension et hors tension du SIM ; tous ces éléments sont placés sur un microcircuit intégré (301). Le circuit comprend également un circuit (214) d'interface de bus qui sert d'interface entre le modem et le SIM au moyen d'une ligne (212) de données commune.

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