Interface Emulator Using FIFOs for External Device Connectivity
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Solution Overview
Problem
Modern integrated circuits (ICs) face challenges in extending their functionality without the physical connection and supporting circuitry for various interfaces, limiting their ability to connect with external devices effectively.
Innovation Solution
The implementation of first-in, first-out memory (FIFO) pairs within the IC to emulate interfaces such as USB, UART, and PCIx, allowing data exchange with external devices through a shared access port, even if the physical connections are not present, with optional timers to enforce latency requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If physical connections and supporting circuitry for various interfaces are implemented in the IC, then the IC can directly connect with external devices using those interfaces, but the device complexity and pin count increase
Solution Approach 1:
The patent creates virtual copies of physical interfaces through software emulation. Instead of implementing actual USB, UART, or other physical interface hardware, the system creates software-based representations that mimic the behavior and protocols of these interfaces. This allows the IC to interact with external devices using standard interface protocols without requiring the complex physical infrastructure of those interfaces.
Solution Approach 2:
The patent implements a universal access port that can emulate multiple different interface types through software. A single physical access port can be configured to support USB, UART, I2C, SPI, and other interface protocols by loading appropriate emulation software. This multi-functional approach allows one physical port to replace what would traditionally require multiple dedicated physical interfaces.
2Adaptability or versatility
If physical connections and supporting circuitry for various interfaces are implemented in the IC, then direct interface communication is enabled, but the number of pins and physical connections required increases
Solution Approach 1:
The patent implements a universal access port that can emulate multiple different interface types through software. A single physical access port can be configured to support USB, UART, I2C, SPI, and other interface protocols by loading appropriate emulation software. This multi-functional approach allows one physical port to replace what would traditionally require multiple dedicated physical interfaces.
3Device complexity
If FIFOs are used to emulate interfaces, then multiple interface types can be supported with minimal circuitry, but latency management becomes more complex
Solution Approach 1:
The patent implements timing monitoring mechanisms that continuously observe the state of FIFO buffers and provide feedback control. When FIFO buffers approach capacity or exceed latency thresholds, the system adjusts data transfer rates, prioritizes critical data, or triggers interrupts to maintain timing requirements. This feedback-based latency management ensures that interface emulation meets real-time requirements despite the added complexity of software-based interface handling.
Data Source
AI summary
An interface emulator for an IC is disclosed. An interface emulator includes a first first-in, first-out memory (FIFO) and a second FIFO. The first FIFO is coupled to receive data from an access port and a second FIFO coupled to receive data from at least one functional unit in the IC. The access port may be coupled to a device that is external to the IC. The external device may write information into the first FIFO, and this information may subsequently be read by a functional unit in the IC. Similarly, the functional unit may write information into the second FIFO, with the external device subsequently reading the information. Information may be written into the FIFOs in accordance with a predefined protocol. Thus, a particular type of interface may be emulated even though the physical connection and supporting circuitry for that interface is not otherwise implemented in the IC.