Serial Bus Interface Buffering to Avoid Processor Wait States
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Solution Overview
Problem
Computer systems experience performance degradation due to the slow speed of serial buses, which require processors to wait for transactions to complete, especially in scenarios involving repeated accesses to peripheral devices.
Innovation Solution
A Smart Serial Bus Interface Circuit (SSBIC) offloads processor tasks by receiving serial-bus instructions, buffering data, and performing data analysis, allowing processors to continue executing other instructions while the SSBIC handles serial bus communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the processor directly handles serial bus transactions, then the system can maintain simple architecture, but the processor performance degrades due to waiting for slow serial bus transactions
Solution Approach 1:
A dedicated serial bus interface circuit is introduced as an intermediary between the processor and peripheral devices. This interface circuit autonomously handles serial bus transactions, data buffering, and protocol management, allowing the processor to continue executing instructions without waiting for slow serial bus operations. The intermediary circuit resolves the contradiction by absorbing the complexity of serial bus communication while preserving processor performance.
2Reliability
If the processor waits for serial bus transactions to complete, then data accuracy is maintained, but the processor loading increases and system response time increases
Solution Approach 1:
The interface circuit performs preliminary actions by buffering data elements before the processor needs them and proactively managing transaction timing. Data is captured and stored in buffers during serial bus transactions, so when the processor requests data, it is already prepared. This eliminates processor waiting time while maintaining data accuracy through controlled buffering and retrieval mechanisms.
3Measurement precision
If repeated accesses to peripheral devices are performed, then data freshness is maintained, but the processor loading increases due to multiple serial bus transactions
Solution Approach 1:
The interface circuit enables continuous data processing by maintaining persistent connections to peripheral devices and performing repeated transactions autonomously without processor intervention. The circuit continuously monitors and retrieves fresh data from devices, ensuring data freshness while the processor remains unloaded. This continuous operation at the interface level resolves the contradiction between data freshness and processor loading.
Data Source
AI summary
An apparatus includes a serial bus and a serial bus interface circuit. The serial bus is to connect to at least one device. The serial bus interface circuit is to receive a sequence of serial-bus-interface read instructions from a processor, to forward the serial-bus-interface read instructions over the serial bus to the at least one device, to buffer data elements, which are received over the serial bus from the at least one device in response to the serial-bus-interface read instructions, and to make the buffered data elements available to the processor.