SPI Host Controller Resume Signal for Secure Element Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current single-wire protocol interfaces between secure elements and host controllers have limited maximum transmission rates, making them unsuitable for high-speed data communication, particularly when large amounts of data need to be transmitted.
Innovation Solution
Implementing a serial peripheral interface (SPI) communication system that includes a host controller with a resume signal generator, transmitter, clock controller, and slave select line activator, and a secure element with a resume signal generator and transmitter, allowing for high-speed data transfer over MOSI and MISO lines with activated slave select lines and clock signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-wire protocol interface is used between secure element and host controller, then device complexity is reduced, but transmission speed is limited to 1.696 Mbps
Solution Approach 1:
The interface is segmented from a single-wire protocol into a multi-wire SPI interface with separate lines for clock (CLK), master-out slave-in (MOSI), master-in slave-out (MISO), and slave select (SS), allowing simultaneous signal transmission and achieving high-speed communication of several tens of Mbps while maintaining clear functional separation
2Speed
If SPI interface with multiple wires is implemented, then transmission speed increases to several tens of Mbps, but device complexity increases
Solution Approach 1:
The SPI interface design allows the host controller to perform multiple functions: generating clock signals, transmitting data via MOSI, receiving data via MISO, and controlling slave selection, all through a unified multi-wire protocol that achieves high-speed communication while consolidating control functions
3Reliability
If resume signal is transmitted before data transmission, then communication synchronization is improved, but transmission time is increased
Solution Approach 1:
The resume signal is transmitted in advance before actual data transmission to wake up the secure element and establish communication synchronization. This preliminary action ensures the slave device is ready to receive data, preventing transmission errors while minimizing delay through efficient signal timing
Data Source
AI summary
A host controller, a secure element, and a serial peripheral interface communications system are provided. The host controller is configured to connect to a secure element via a serial peripheral interface and includes: a resume signal generator configured to generate a first resume signal indicating a start of communication with the secure element; a transmitter configured to transmit the first resume signal to the secure element; a slave select line activator configured to activate a slave select line after the first resume signal is transmitted; and a clock controller configured to transmit a first clock signal to the secure element over a clock line based on the slave select line being activated, and the transmitter is further configured to transmit a first signal containing first data to the secure element over a master-out slave-in line (an MOSI line) while the first clock signal is being transmitted.