Data Buffer/Register: Data Width 8-bit to 64-bit

Q: What is the primary function of a data buffer/register in a Bus Interface Unit?

Its primary function is to temporarily store data during transfers between different system buses, managing speed mismatches and preventing data loss to ensure reliable communication in industrial control systems.

Q: How does a data buffer differ from a standard memory register?

A data buffer is designed for temporary storage during active data flow, often with queue management (e.g., FIFO), while a standard register typically holds data for processing or control purposes without emphasis on transfer synchronization.

Q: What are common failure modes for data buffers/registers?

Common failures include clock signal issues causing data corruption, overheating leading to latch-up, voltage spikes damaging semiconductor elements, and physical wear on connectors affecting signal integrity.

Component Specifications

Definition

A data buffer/register is a critical electronic component within a Bus Interface Unit (BIU) that temporarily stores digital data during transfer operations between the CPU, memory, and peripheral devices. It acts as an intermediary to handle speed mismatches, manage data queues, and maintain signal integrity by latching data values at precise clock cycles. This component typically consists of flip-flops or latches arranged in parallel to hold multiple bits simultaneously, with control logic for read/write operations, enabling efficient data pipelining and reducing bottlenecks in industrial automation systems.

Working Principle

The data buffer/register operates by latching incoming digital data on the rising or falling edge of a clock signal, holding it stable until the receiving system is ready to process it. It uses flip-flop circuits to store binary values (0 or 1) for each data bit, with control inputs for enabling read/write functions. In a Bus Interface Unit, it synchronizes data flow between asynchronous buses (e.g., connecting a fast processor to slower I/O devices), employing handshaking protocols to prevent overrun or underrun errors. Advanced versions may include FIFO (First-In-First-Out) or LIFO (Last-In-First-Out) logic for queue management.

Materials

Semiconductor materials: Silicon (Si) for integrated circuits; Substrate: FR-4 epoxy laminate or ceramic for PCB mounting; Encapsulation: Epoxy molding compound or plastic (e.g., PBT) for protection; Connectors: Gold-plated copper alloy pins; Lead frames: Copper alloy (e.g., C194).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Data Width	8-bit to 64-bit
Package Type	DIP, SOIC, QFP
Power Supply	3.3V or 5V DC
Clock Frequency	Up to 500 MHz
Storage Capacity	Typically 1 to 32 words
Propagation Delay	<10 ns
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, DIN 41612

Parent Products

This component is used in the following industrial products

Bus Interface Unit

A hardware component within a DMA engine that manages data transfer between the DMA controller and the system bus.

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Engineering Analysis

Risks & Mitigation

Data corruption due to timing errors
Overheating from high-frequency operation
Electrostatic discharge (ESD) damage
Compatibility issues with bus protocols

FMEA Triads

Trigger: Clock signal skew or jitter
Failure: Data misalignment or loss during transfer
Mitigation: Use precision oscillators and implement error-checking protocols like parity bits

Trigger: Voltage fluctuations in power supply
Failure: Incorrect data latching or component burnout
Mitigation: Incorporate voltage regulators and surge protection circuits

Trigger: Environmental contaminants (e.g., dust, moisture)
Failure: Corrosion of pins or short circuits
Mitigation: Apply conformal coating and use sealed enclosures in harsh industrial settings

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% for voltage levels, ±0.1 ns for timing parameters

Test Method

Automated test equipment (ATE) for functional verification, oscilloscope analysis for signal integrity, environmental stress screening (ESS) for reliability

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

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Manufacturing capability

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Inspection readiness

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Manufacturers of Data Buffer/Register

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Frequently Asked Questions

What is the primary function of a data buffer/register in a Bus Interface Unit?