Dual mode controller for ISO7816 and USB enabled smart cards

1. A dual mode smart card controller, comprising an ISO 7816 smart card control logic, card detect logic and power control logic; and 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 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; said dual mode smart card controller further comprising a host bus protocol handler coupled to said ISO7816 smart card control logic, card detect logic and power control logic and adapted to generate PC host bus communication signals.

2. A dual mode smart card controller as claimed in claim 1 , further comprising a PC host bus I/O controller coupled to said host bus protocol handler for exchanging commands and data between said dual mode smart card controller and a PC host bus.

3. A dual mode smart card controller as claimed in claim 1 , further comprising an identification power sequencer adapted to provide power to a smart card for a predetermined time period, and if said smart card is a USB card to discontinue power to said USB smart card after said predetermined time period.

4. A dual mode smart card controller as claimed in claim 1 , further comprising a power switch to couple power to a smart card.

5. A dual mode smart card controller as claimed in claim 1 , wherein said USB card identification logic monitoring the signal states of preselected signal lines associated with a smart card to determine if the smart card is an ISO7816 or USB type smart card.

6. A dual mode smart card controller as claimed in claim 5 , wherein said preselected signal lines comprise the C 4 and C 8 signals defined by the USB specification, represented by a DATA+ and a DATA− signals of said USB specification.

7. A dual mode smart card controller as claimed in claim 1 , wherein said signal filter monitors a C 4 signal line to determine if said C 4 signal line is logic high for more than 2.5 micro-seconds, and wherein if said C 4 signal line is logic high for more than 2.5 micro-seconds then control of a smart card is passed to a PC host USB hub circuit.

8. A dual mode smart card controller as claimed in claim 7 , wherein if wherein if said C 4 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.

9. 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 card; said dual mode smart card controller further comprising a host bus protocol handler coupled to said ISO7816 smart card control logic, card detect logic and power control logic and adapted to generate PC host bus communication signals.

10. A dual mode smart card controller as claimed in claim 9 , further comprising a PC host bus I/O controller coupled to said host bus protocol handler for exchanging commands and data between said dual mode smart card controller and a PC host bus.

11. A dual mode smart card controller as claimed in claim 9 , further comprising an identification power sequencer adapted to provide power to a smart card for a predetermined time period, and if said smart card is a USB card to discontinue power to said USB smart card after said predetermined time period.

12. A dual mode smart card controller as claimed in claim 9 , further comprising a power switch to couple power to a smart card.

13. A dual mode smart card controller as claimed in claim 9 , wherein said USB card identification logic monitoring the signal states of preselected signal lines associated with a smart card to determine if the smart card is an ISO7816 or USB type smart card.

14. A dual mode smart card controller as claimed in claim 13 , wherein said preselected signal lines comprise the C 4 and C 8 signals defined by the USB specification, represented by a DATA+ and a DATA− signals of said USB specification.

15. A dual mode smart card controller as claimed in claim 9 , wherein said signal filter monitor a C 4 signal line to determine if said C 4 signal line is logic high for more than 2.5 micro-seconds, and wherein if said C 4 signal line is logic high for more than 2.5 micro-seconds then control of a smart card is passed to embedded USB hub circuit.

16. A dual mode smart card controller as claimed in claim 15 , wherein if said C 4 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.

17. 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 card if enabled by said USB enable signal; said dual mode smart card controller further comprising a host bus protocol handler coupled to said ISO7816 smart card control logic, card detect logic and power control logic and adapted to generate PC host bus communication signals.

18. A dual mode smart card controller as claimed in claim 17 , further comprising a PC host bus I/O controller coupled to said host bus protocol handler for exchanging commands and data between said dual mode smart card controller and a PC host bus.

19. A dual mode smart card controller as claimed in claim 17 , further comprising an identification power sequencer adapted to provide power to a smart card for a predetermined time period, and if said smart card is a USB card to discontinue power to said USB smart card after said predetermined time period.

20. A dual mode smart card controller as claimed in claim 17 , further comprising a power switch to couple power to a smart card.

21. A dual mode smart card controller as claimed in claim 17 , wherein said USB card identification logic monitors the signal states of preselected signal lines associated with a smart card to determine if the smart card is an ISO7816 or USB type smart card.

22. A dual mode smart card controller as claimed in claim 21 , wherein said preselected signal lines comprise the C 4 and C 8 signals defined by the USB specification, represented by a DATA+ and a DATA− signals of said USB specification.

23. A method of determining an ISO7816 or USB smart card comprising the steps of:

coupling power to a smart card for a predetermined time period;

polling the signal states of preselected smart card signals;

determining if said smart card is a USB smart card or an ISO7816 smart card; and

masking the identity of a USB smart card to an ISO7816 card detection logic circuit; and

monitoring the state of a C 4 signal line, and if said C 4 signal line is logic high for more than 2.5 micro-seconds then control of a smart card is passed to a PC host USB hub circuit, and if said C 4 signal line is logic high for less than 2.5 micro-seconds then control of a smart card is passed to an ISO7816 control logic.

24. A method as claimed in claim 23 , further comprising the step of monitoring the state of a C 4 signal line, and if said C 4 signal line is logic high for more than 2.5 micro-seconds then control of a smart card is passed to an embedded PC host USB hub circuit, and if said C 4 signal line is logic high for less than 2.5 micro-seconds then control of a smart card is passed to an ISO7816 control logic.