INDUSTRY COMPONENT

Priority Register

Priority Register is a digital circuit component in memory arbitration units that stores and manages access priority levels for multiple memory request sources.

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Component Specifications

Definition
A Priority Register is a specialized digital storage component within Memory Arbitration Units that maintains and processes priority values assigned to different memory access requests. It typically consists of multiple flip-flops or latches arranged to store priority bits, with accompanying logic circuits for priority comparison, updating, and conflict resolution. The register enables fair and efficient memory bandwidth allocation by implementing priority-based scheduling algorithms.
Working Principle
The Priority Register operates by storing binary priority values for each request source. When multiple memory access requests occur simultaneously, the register's comparison logic evaluates stored priorities to determine the highest-priority request. It may implement fixed priority, round-robin, or dynamic priority schemes. The register updates priority values based on system policies, such as aging algorithms to prevent starvation of lower-priority requests.
Materials
Semiconductor materials (silicon, gallium arsenide), doped silicon substrates, copper/aluminum interconnects, dielectric layers (SiO2, Si3N4), packaging materials (ceramic, plastic compounds)
Technical Parameters
  • Bit Width 8-32 bits
  • Package Type QFN, BGA, CSP
  • Clock Frequency 100 MHz - 2 GHz
  • Priority Levels 4-256 levels
  • Operating Voltage 1.2V - 3.3V
  • Power Consumption 5-50 mW
  • Temperature Range -40°C to +125°C
Standards
ISO 26262, IEC 61508, JEDEC JESD22, IPC-7351

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Priority Register.

priority register memory arbitration digital logic semiconductor component access control scheduling hardware electronic design Priority Register in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Memory Arbitration Unit

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

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Engineering Analysis

Risks & Mitigation
  • Priority inversion causing system deadlock
  • Timing violations at high frequencies
  • Single event upsets in radiation environments
  • Thermal-induced performance degradation
FMEA Triads
Trigger: Clock signal instability
Failure: Incorrect priority comparison results
Mitigation: Implement clock domain synchronization, add metastability filters
Trigger: Power supply noise
Failure: Corrupted priority value storage
Mitigation: Use decoupling capacitors, implement error-correcting codes for critical bits
Trigger: Electromagnetic interference
Failure: Spurious priority changes
Mitigation: Apply shielding, implement majority voting logic, use hysteresis in comparators

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±5% for timing parameters, ±2% for voltage levels, priority resolution accuracy >99.9%
Test Method
Built-in self-test (BIST), scan chain testing, functional verification with constrained random test patterns, formal verification for critical paths

Buyer Feedback

★★★★☆ 4.6 / 5.0 (10 reviews)

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Frequently Asked Questions

What is the main function of a Priority Register?

The Priority Register stores and manages priority levels for memory access requests, enabling efficient arbitration when multiple components compete for memory bandwidth.

How does a Priority Register prevent request starvation?

Advanced Priority Registers implement aging algorithms that gradually increase priority of waiting requests, or use round-robin schemes to ensure all requests eventually get serviced.

Can Priority Register values be dynamically changed?

Yes, most modern Priority Registers support dynamic priority adjustment based on system conditions, workload patterns, or quality-of-service requirements.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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