Bus Interface Controller for NICs | PCIe 3.0 x4

Product Specifications

Technical details and manufacturing context for Bus Interface Controller

Definition

The Bus Interface Controller is a critical sub-component of a Network Interface Controller (NIC) responsible for handling the data transfer protocol, timing, and electrical signaling between the NIC's internal logic and the host computer's system bus (e.g., PCI, PCIe, ISA). It translates data and commands from the network processing unit into a format compatible with the system bus and vice-versa, ensuring reliable and efficient data flow to and from the host system's memory and CPU. This controller operates by implementing the physical layer and data link layer protocols of the specific system bus standard. It receives data packets from the NIC's MAC/PHY layers, packages them into bus transaction frames (including address, data, and control signals), and manages the bus arbitration and handshaking process. Conversely, it receives data and commands from the CPU via the bus, unpacks them, and forwards instructions or data to the appropriate internal modules of the NIC for processing and transmission onto the network. The controller is typically fabricated on a silicon integrated circuit die with copper interconnects. Key parameters include a PCIe 3.0 x4 bus interface type, a data transfer rate of 32–128 Gbit/s, an operating voltage of 3.3 V DC ±5%, power consumption of 2–5 W, an operating temperature range of 0–70 °C, a storage temperature range of -40–85 °C, relative humidity of 10–90% non-condensing, ESD tolerance of ±2 kV (HBM model, per IEC 61000-4-2), MTBF of 50,000–100,000 hours, a form factor of 68.9 x 18.7 mm, and a weight of 20–50 g. These values are reference ranges and must be confirmed for the specific model and application. The controller is designed for use in computer and electronic product manufacturing, serving as a component in NICs. It is not a standalone product but an integral part of a larger assembly. For procurement, verify compatibility with the host system's bus standard and slot, as well as electrical and thermal requirements. Maintenance signals include monitoring for data transfer errors, bus timeouts, or overheating. Failure boundaries are defined by the controller's inability to communicate with the system bus, to loss of network connectivity. Always consult the legal manufacturer or supplier for model-specific specifications and standards compliance.

Working Principle

The controller operates by implementing the physical layer and data link layer protocols of the specific system bus standard. It receives data packets from the NIC's MAC/PHY layers, packages them into bus transaction frames (including address, data, and control signals), and manages the bus arbitration and handshaking process. Conversely, it receives data and commands from the CPU via the bus, unpacks them, and forwards instructions or data to the appropriate internal modules of the NIC for processing and transmission onto the network.

Common Materials

Silicon (for integrated circuit die), Copper (for interconnects)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bus Interface Type	PCIe 3.0 x4	Determines compatibility with host systemPCIe Base Specification 3.0
Data Transfer Rate	32–128 Gbit/s	Effective throughput depends on bus width and protocol
Operating Voltage	3.3 ±5% V DC	Must match PCIe slot power
Power Consumption	2–5 W	Higher throughput increases power draw
Operating Temperature	0–70 °C	Industrial grade may extend to -40–85°C
Storage Temperature	-40–85 °C	Non-operating condition
Relative Humidity	10–90 %	Non-condensing
ESD Tolerance	±2 kV	HBM modelIEC 61000-4-2
MTBF	50000–100000 h	Depends on operating conditions
Form Factor	68.9 x 18.7 mm	Standard PCIe card dimensions
Weight	20–50 g	Depends on PCB and components

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

Bus Interface Logic Core Part
Implements the core state machine and protocol logic for the specific bus standard, handling transaction initiation, completion, and error management.

Material: silicon
Physical Layer Interface (PHY)
Manages the electrical signaling, clock data recovery, and serialization/deserialization (SerDes) for the physical connection to the bus.

Material: silicon
Direct Memory Access (DMA) Engine
Facilitates high-speed data transfers directly between the NIC's buffer memory and the host system's memory without continuous CPU intervention.

Material: silicon
Configuration Registers Part
A set of memory-mapped registers used by the system BIOS and OS drivers to identify, configure, and control the NIC via the bus.

Material: silicon

Application & selection

Application Fit & Sizing Matrix

Operational Limits

voltage:	3.3V ±5%
temperature:	0°C to 70°C (operational), -40°C to 85°C (storage)
clock frequency:	Up to 133 MHz

Media Compatibility

✓ PCI Express 3.0/4.0 bus ✓ DDR4 SDRAM interface ✓ Ethernet PHY chips

Unsuitable: High-vibration industrial environments without additional mounting

Sizing Data Required

System bus type and version (e.g., PCIe 3.0 x4)
Required data throughput (Gbps)
Host processor architecture and OS driver support

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Overheating and thermal degradation

Cause: Inadequate cooling, dust accumulation on heat sinks, or excessive ambient temperatures leading to component stress and premature failure.

Signal integrity degradation

Cause: Corrosion or contamination of connector pins, PCB trace damage from vibration, or electromagnetic interference disrupting data transmission.

Maintenance Indicators

Intermittent or complete loss of communication signals, indicated by error logs or system alerts.
Audible high-pitched whine or buzzing from the controller, or visible discoloration/bulging of capacitors on the PCB.

Engineering Tips

Implement regular thermal monitoring with infrared inspections and ensure clean, unobstructed airflow to prevent overheating.
Use conformal coating on PCBs and schedule periodic connector cleaning with approved solvents to maintain signal integrity.

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

Compliance & Manufacturing Standards

Applicable Standards

ISO 26262:2018 (Functional Safety for Road Vehicles) ANSI/EIA-485-A (Electrical Characteristics of Generators and Receivers for Use in Balanced Digital Multipoint Systems) DIN 41612 (Connectors for Printed Boards; Backplane Connectors)

Quoted from the published standard.

Manufacturing Precision

Pin Alignment: +/-0.05mm
Signal Timing Skew: +/-100ps

Quality Inspection

High-Speed Signal Integrity Test (Eye Diagram Analysis)
Environmental Stress Screening (Temperature Cycling and Vibration)

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

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Bus Interface Controller

Manufacturer profiles associated with Bus Interface Controller.

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Frequently Asked Questions

What is the role of the Bus Interface Controller in a NIC?

The Bus Interface Controller manages communication between the NIC and the host computer's system bus. It handles data transfer protocol, timing, and electrical signaling, translating data between the NIC's internal logic and the bus format.

What bus interface types are supported?

The listed parameter indicates PCIe 3.0 x4, but other types may be available. Always confirm the exact interface type with the manufacturer for your specific model.

What are the typical operating conditions?

Typical operating temperature is 0–70 °C, storage -40–85 °C, and relative humidity 10–90% non-condensing. Power consumption ranges from 2–5 W, and operating voltage is 3.3 V DC ±5%.

How should I verify the specifications before purchasing?

Consult the legal manufacturer or supplier for model-specific datasheets and confirm parameters such as data transfer rate, power consumption, and environmental limits. Standards like PCIe Base Specification 3.0 and IEC 61000-4-2 are references, not guarantees of compliance.

Related equipment

Applied To / Applications

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

Network Interface Controller

View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Downstream Applications

Specialized Tooling

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 12 October 2026

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