Smart card message transfer without microprocessor intervention
US5787101A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 1997 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | May 5, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4226
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A signal processing system includes a system control processor, an integrated circuit (IC) card, or smart card, for access control processing, system memory, and a smart card interface circuit including a direct memory access interface circuit for providing high speed access to the system memory. Data transfers between the smart card and system memory occur via the smart card interface circuit and the direct memory access interface circuit. The system controller initializes the smart card interface circuit prior to a transfer and, after a transfer is complete, processes transferred data that is stored in system memory. Processing by the system controller is not required during the transfer to complete the transfer. The smart card interface circuit also filters the transferred data stream by checking and generating parity bits as required and removing smart-card related control data from the data that is stored in memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.