INDUSTRY COMPONENT

Linear Feedback Shift Register

Linear Feedback Shift Register (LFSR) is a sequential digital circuit used for generating pseudo-random bit sequences and implementing cyclic redundancy check (CRC) operations in industrial systems.

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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
  • 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
Standards
ISO/IEC 13239, ISO/IEC 14443, DIN 66259

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Linear Feedback Shift Register.

LFSR Linear Feedback Shift Register CRC generator error detection digital logic shift register industrial electronics data integrity feedback polynomial Linear Feedback Shift Register in Computer, Electronic and Optical Product Manufacturing

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

Interchangeable Parts

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

Buyer Feedback

★★★★☆ 4.8 / 5.0 (14 reviews)

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Line Driver / Output Buffer Linear Regulator (LDO)