Dual mode controller for ISO7816 and USB enabled smart cards

A dual mode smart card controller as claimed in claim 9, wherein if wherein if said C4 signal line is logic high for less than 2.5 micro-seconds then control of a smart card is passed to said ISO7816 control logic.

A dual mode smart card controller, comprising an ISO7816 smart card control logic, card detect logic and power control logic;

• a USB card identification logic coupled to said card detect logic and adapted to mask a USB smart card from said card detect logic, and a USB signal filter coupled to said smart card control logic and adapted to monitor a preselected smart card signal line and change the state of said signal line if a USB card is present;
• and an embedded USB hub circuit to provide input and output commands to a USB smart cards.

A dual mode smart card controller as claimed in claim 19, wherein if wherein if said C4 signal line is logic high for less than 2.5 micro-seconds then control of a smart card is passed to said ISO7816 control logic.

A dual mode smart card controller, comprising an ISO7816 smart card control logic, card detect logic and power control logic;

• a USB card identification logic coupled to said card detect logic and adapted to mask a USB smart card from said card detect logic, and further adapted to generate a USB enable signal if said USB card identification logic determines that a USB smart card is present;
• and an embedded USB hub circuit to provide input and output commands to a USB smart cards if enabled by said USB enable signal.