Request Queue: Power Consumption < 100 mW

Q: What is the primary function of a request queue in a bus arbiter?

The primary function is to manage and prioritize multiple access requests to a shared bus, ensuring orderly and efficient data transfer without conflicts.

Q: How does a request queue improve system performance?

It reduces bus contention and idle time by scheduling requests optimally, leading to higher throughput and lower latency in communication between devices.

Q: Can request queues be customized for specific applications?

Yes, queue depth, arbitration algorithms, and priority schemes can be tailored to meet the real-time requirements of specific industrial applications.

Component Specifications

Definition

In industrial automation and embedded systems, a request queue is a critical component of a bus arbiter that temporarily stores and sequences access requests from various peripherals, processors, or subsystems competing for the shared bus. It implements scheduling algorithms to determine the order of service, ensuring efficient data transfer and preventing conflicts in multi-master bus architectures like PCI, CAN, or industrial Ethernet.

Working Principle

The request queue operates by receiving and storing incoming access requests in a first-in-first-out (FIFO) or priority-based buffer. The arbiter evaluates these requests based on predefined rules (e.g., fixed priority, round-robin, or time-sensitive networking) and grants bus access to the highest-priority request. Once serviced, the request is removed from the queue, and the next request is processed, minimizing bus idle time and maximizing throughput.

Materials

Typically implemented in silicon as part of an integrated circuit (IC) using semiconductor materials like silicon, with digital logic gates and memory cells (e.g., SRAM or flip-flops). No external materials are involved.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Queue Depth	8 to 256 entries
Bus Interface	PCIe, CAN, Ethernet, SPI, I2C
Clock Frequency	Up to 200 MHz
Power Consumption	< 100 mW
Arbitration Algorithm	Fixed Priority, Round-Robin, Weighted Fair Queuing
Operating Temperature	-40°C to 85°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 11898, ISO 26262, IEC 61131, IEEE 802.3

Parent Products

This component is used in the following industrial products

Bus Arbiter

A hardware component within a Bus Interface Unit that manages access to a shared bus by multiple devices or processors.

View Product Details

Memory Arbitration Unit

A hardware component within a Graphics Interface Controller that manages and prioritizes memory access requests from multiple sources.

View Product Details

Engineering Analysis

Risks & Mitigation

Queue overflow leading to data loss
Priority inversion causing system deadlock
Timing violations in high-speed operations

FMEA Triads

Trigger: Insufficient queue depth for high traffic
Failure: Request overflow and data corruption
Mitigation: Implement dynamic queue resizing or flow control mechanisms

Trigger: Faulty arbitration logic
Failure: Unfair bus access or system hang
Mitigation: Use redundant arbiters and periodic self-test routines

Trigger: Clock signal instability
Failure: Timing errors in queue operations
Mitigation: Employ phase-locked loops (PLLs) and robust clock distribution networks

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Signal timing tolerance within ±5% of clock period, voltage levels compliant with bus specifications

Test Method

Functional testing via simulation and hardware-in-the-loop (HIL) testing, compliance with industry bus standards

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Request Queue

Manufacturer profiles associated with Request Queue.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of a request queue in a bus arbiter?