Editorial Technical Reference

Arbiter

This page explains how Arbiter is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A hardware component within a DMA Engine that manages and resolves access conflicts between multiple DMA channels competing for shared system resources.

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Product Specifications

Technical details and manufacturing context for Arbiter

Definition
The Arbiter is a critical control component in Direct Memory Access (DMA) Engine architectures. It functions as a decision-making circuit that coordinates simultaneous requests from multiple DMA channels attempting to access the system bus, memory controller, or other shared peripherals. By implementing priority schemes (fixed, round-robin, or weighted) and fairness algorithms, it prevents data corruption, ensures deterministic latency for high-priority transfers, and maximizes overall DMA throughput by efficiently scheduling resource access without CPU intervention. The component is typically fabricated on a silicon substrate with copper interconnects, and its design parameters include support for 4 to 16 DMA channels, arbitration latency of 1 to 4 clock cycles, operating frequencies from 100 to 400 MHz, supply voltages of 1.8 to 3.3 V, power consumption of 10 to 50 mW, and an industrial temperature range of -40 to 85 °C. It is commonly packaged in a QFN-48 package and manufactured using a 28 to 65 nm CMOS process. The device offers ESD protection of ±2 kV per IEC 61000-4-2 and has a mean time between failures (MTBF) of 100,000 hours at 25 °C. These values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier.
Working Principle
The Arbiter continuously monitors request lines from all active DMA channels. When multiple requests are asserted simultaneously, it evaluates them against a configured priority policy. It grants access (via a grant signal) to the highest-priority requester, while placing others in a wait state. It may incorporate features like request masking, burst transfer support, and timeout mechanisms. Operation is typically synchronous to the DMA engine's clock, with decision logic implemented via state machines or combinatorial circuits.
Common Materials
Silicon (semiconductor substrate), Copper interconnects
Technical Parameters
ParameterTypical rangeNotes & selection driver
Number of Channels4–16Number of DMA channels that can be arbitrated
Arbitration Latency1–4 clock cyclesTime to grant bus access after request
Operating Frequency100–400 MHzMaximum clock frequency supported
Supply Voltage1.8–3.3 VCore and I/O voltage range
Power Consumption10–50 mWTypical dynamic power at max frequency
Operating Temperature-40–85 °CIndustrial temperature range
Package TypeQFN-48Common package for integration
Process Technology28–65 nmCMOS process node
ESD Protection±2 kVHBM modelIEC 61000-4-2
MTBF100000 hoursReliability at 25°C

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

Components / BOM
  • Request Interface Part
    Receives and buffers access requests from DMA channels
    Material: Semiconductor logic gates
  • Priority Decoder
    Evaluates request priorities based on configured scheme
    Material: Semiconductor logic gates
  • Grant Generator
    Issues grant signals to winning channel and wait states to others
    Material: Semiconductor logic gates
  • Configuration Registers Part
    Stores arbitration parameters (priorities, timeouts, masks)
    Material: Semiconductor memory cells

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: N/A (electronic component)
other spec: Supply voltage: 1.8V to 3.3V ±5%, Clock frequency: up to 200 MHz, Power consumption: < 500 mW typical
temperature: 0°C to 70°C (operational), -40°C to 85°C (storage)
Media Compatibility
✓ Digital signal processing systems ✓ High-speed data acquisition systems ✓ Embedded computing platforms
Unsuitable: High-voltage or high-current switching environments without proper isolation
Sizing Data Required
  • Number of DMA channels to be arbitrated
  • Maximum data transfer rate per channel (MB/s)
  • System bus architecture and protocol (e.g., AXI, AHB, PCIe)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Seal degradation
Cause: Chemical incompatibility with process media leading to swelling, hardening, or cracking of elastomeric seals
Sensor drift/calibration loss
Cause: Exposure to extreme temperatures, vibration, or contamination affecting measurement accuracy
Maintenance Indicators
  • Erratic or inconsistent readings from the arbiter unit
  • Visible fluid leaks or moisture accumulation around sensor connections
Engineering Tips
  • Implement regular calibration checks using traceable standards to maintain measurement accuracy
  • Ensure proper material selection for seals and wetted parts based on specific process media compatibility

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
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Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Manufacturers of Arbiter

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Frequently Asked Questions

What is the role of an arbiter in a DMA engine?

The arbiter manages access to shared system resources such as the bus or memory controller. It resolves conflicts when multiple DMA channels request access simultaneously, ensuring orderly and efficient data transfers.

What priority schemes can the arbiter implement?

It can implement fixed, round-robin, or weighted priority schemes, depending on the configuration. These schemes determine which channel gets access first when multiple requests occur.

What are the typical electrical specifications?

Reference ranges include operating frequency of 100-400 MHz, supply voltage of 1.8-3.3 V, and power consumption of 10-50 mW. These are typical values and must be confirmed for the specific model.

How should I verify the arbiter's compliance with standards?

The listed ESD protection of ±2 kV per IEC 61000-4-2 is a reference. You should request the manufacturer's datasheet and test reports to confirm compliance for your application.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

DMA Engine
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Scheduler
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Interconnect Fabric
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Interconnect Router
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Industrial Ecosystem & Supply Chain Structure

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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 · Page last updated 13 October 2026

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