Linear Feedback Shift Register: Bit Length 4-64 bits

Component Specifications

Definition

A Linear Feedback Shift Register is a shift register whose input bit is a linear function of its previous state, typically implemented using XOR gates. In industrial applications, it serves as the core computational element in CRC generators and checkers for error detection in data transmission systems. The LFSR operates by shifting bits through flip-flops while feeding back specific bits through linear feedback to create deterministic yet pseudo-random sequences.

Working Principle

The LFSR works by shifting bits through a series of flip-flops (registers) on each clock cycle. Selected bits from the register chain are combined using XOR gates and fed back to the input, creating a feedback polynomial. For CRC applications, the LFSR is initialized with a seed value, and data bits are processed sequentially through XOR operations with the feedback polynomial, resulting in a remainder that serves as the CRC code for error detection.

Materials

Semiconductor materials (silicon, gallium arsenide), copper interconnects, dielectric materials, packaging materials (epoxy, ceramic)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bit Length	4-64 bits
Package Type	QFP, BGA, SOIC
Clock Frequency	Up to 500 MHz
Operating Voltage	1.8V-5V
Power Consumption	5-50 mW
Temperature Range	-40°C to 125°C
Feedback Polynomial	Configurable

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/IEC 13239, ISO/IEC 14443, DIN 66259

Parent Products

This component is used in the following industrial products

CRC Generator/Checker

A digital circuit component within a MAC Controller that generates and verifies Cyclic Redundancy Check codes for data integrity in network communications.

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Engineering Analysis

Risks & Mitigation

Single event upset in radiation environments
Timing violations at high frequencies
Feedback polynomial selection errors
Power supply noise affecting bit sequences

FMEA Triads

Trigger: Clock signal jitter or skew
Failure: Incorrect bit shifting leading to CRC calculation errors
Mitigation: Implement clock distribution networks with balanced delays and use PLLs for clock stabilization

Trigger: Power supply voltage fluctuations
Failure: Bit errors in register states causing incorrect CRC values
Mitigation: Implement voltage regulators with adequate decoupling capacitors and power conditioning circuits

Trigger: Incorrect feedback polynomial configuration
Failure: Non-optimal error detection capability or short sequence length
Mitigation: Validate polynomial selection against industry standards and perform simulation testing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5% clock frequency tolerance, ±2% voltage regulation tolerance

Test Method

Built-in self-test (BIST), boundary scan testing (JTAG), functional verification with known test vectors, temperature cycling tests

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

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Inspection readiness

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Supplier transparency

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Manufacturers of Linear Feedback Shift Register

Manufacturer profiles associated with Linear Feedback Shift Register.

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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 an LFSR in industrial systems?

The primary function is to generate CRC codes for error detection in data transmission and storage systems, ensuring data integrity in industrial communication protocols.

How does the feedback polynomial affect LFSR performance?

The feedback polynomial determines the sequence length and randomness properties. Primitive polynomials generate maximum-length sequences, which are essential for effective CRC error detection capabilities.

Can LFSRs be used for encryption in industrial applications?

While LFSRs can generate pseudo-random sequences, they are not cryptographically secure for encryption but are commonly used for scrambling and CRC generation in industrial data protocols.

Data Basis

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

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.

Linear Feedback Shift Register