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Infineon Technologies ADM6918ABT1
- Part No.:
- ADM6918ABT1
- Manufacturer:
- Infineon Technologies
- Category:
- Controllers
- Package:
- 128-BFQFP
- Datasheet:
-
ADM6918ABT1.pdf
- Description:
- IC SWITCH CNTRLR 10/100 128FQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,175
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Product details
Overview
ADM6918ABT1 from Infineon Technologies is an 18-port 10/100 Mbps Ethernet switch controller with integrated MII/RMII/SS-SMII interfaces, supporting IEEE 802.3u Fast Ethernet, hardware-based address learning and aging, VLAN tagging (802.1Q), and priority-based QoS. It operates at 3.3 V supply, features 128-entry MAC address table, and targets embedded networking in industrial gateways and managed edge switches.
For engineers reviewing the ADM6918ABT1 datasheet, ADM6918ABT1 pinout, ADM6918ABT1 application, or ADM6918ABT1 equivalent, key selection criteria include port count scalability, SS-SMII interface compatibility, hardware VLAN support, and EEPROM-based configuration for headless boot-critical for space-constrained, fanless network appliances requiring deterministic initialization.
Technical Context
The ADM6918ABT1 implements a non-blocking store-and-forward switching fabric with per-port ingress/egress bandwidth control, broadcast storm filtering, and smart discard logic to prevent buffer overflow under traffic asymmetry. Its internal 128 KB packet buffer memory is partitioned across 18 ports with dynamic allocation based on traffic load.
It supports three physical interface modes: standard MII (24-pin), Reduced MII (RMII, 7-pin), and Serial SMII (SS-SMII, 5-pin), enabling flexible PHY coupling while maintaining full line-rate forwarding at 100 Mbps per port. Configuration is handled via hardware strapping, serial EEPROM (93C66-compatible), or SMI (Serial Management Interface) register access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Port Count | 18 × 10/100 Mbps Ethernet ports with independent duplex and speed negotiation |
| Switch Fabric | Non-blocking store-and-forward architecture supporting full-duplex line-rate forwarding |
| MAC Address Table | 128-entry hardware address table with automatic learning, aging (default 300 s), and static entry locking |
| VLAN Support | IEEE 802.1Q tag insertion/stripping, port-based VLANs, and trunking port forwarding |
| Interface Modes | MII, RMII, and SS-SMII - selectable via hardware pins; SS-SMII reduces PHY interface to 5 signals |
| Power Supply | Single 3.3 V ± 5% supply; no internal voltage regulation required |
| Operating Temperature | 0 °C to +70 °C ambient - suitable for commercial-grade industrial enclosures |
Pinout & Package
ADM6918ABT1 is housed in a 128-pin LQFP package (14 mm × 14 mm, 0.4 mm pitch), RoHS-compliant and green-qualified per Infineon's 2005-11-03 revision. Pin assignment aligns with SS-SMII interface configuration as specified in Figure 2 of the Rev 1.01 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EECS, EESK, EDI, EDO | EEPROM Serial Interface | Configures device boot behavior and default register values; compatible with 93C66 16-bit EEPROM |
| SMI_SDC, SMI_SDIO | Serial Management Interface | Allows runtime read/write access to all internal switch registers (address space 0x0000–0x01FF) |
| TXD[3:0], RXD[3:0], TXEN, RXDV, CRS, COL | SS-SMII Data & Control | 5-signal serial interface supporting 10/100 Mbps with clock recovery; eliminates external PHY clock routing |
| LED_ALRT, LED_COL | Status Indicator Outputs | Open-drain outputs drive external LEDs for alert (e.g., link fault, security violation) and collision detection |
| RESET_N | Active-Low Asynchronous Reset | Hardware reset input; must be held low ≥ 100 ns after power stabilization to initialize internal state machines |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Address Learning | Automatic MAC address acquisition and aging without CPU intervention - reduces host driver overhead |
| Broadcast Storm Filtering | Dynamically limits broadcast/multicast packet rate per port to prevent network saturation |
| Smart Discard Logic | Discards low-priority frames before buffer exhaustion, preserving high-priority traffic integrity |
| IGMP & Spanning Tree Forwarding | Special packets (e.g., IGMP queries, BPDU) are forwarded to CPU port for protocol stack processing |
| Bandwidth Control | Per-port ingress/egress rate limiting with programmable thresholds (1–100% of line rate) |
Applications
| Industrial Ethernet Gateway | Managed Edge Switch |
|---|---|
Use Scenario: Protocol translation between Modbus TCP and EtherNet/IP in factory-floor PLC networks. IC Role / Device Role / Timing Role: Central switch controller managing 18 field devices with deterministic latency and VLAN segregation. Use Value: Hardware-based address learning eliminates software polling; SS-SMII reduces PCB layer count and EMI susceptibility. |
Use Scenario: Compact 18-port rack-mount switch for building automation systems with PoE-powered sensors. IC Role / Device Role / Timing Role: Traffic manager enforcing QoS policies and broadcast suppression in mixed-traffic environments. Use Value: Smart discard prevents buffer overflow during transient multicast bursts; LED_ALRT enables remote fault identification. |
| Network Appliance | Telecom Access Node |
Use Scenario: Firewall/NAT appliance with dual WAN uplinks and 16 LAN ports for SMB branch offices. IC Role / Device Role / Timing Role: Layer 2 forwarding engine offloading CPU from frame-level switching decisions. Use Value: EEPROM-based configuration enables zero-touch provisioning; RMII mode simplifies PHY integration with low-pin-count SoCs. |
Use Scenario: DSLAM or fiber node aggregating residential broadband traffic before upstream aggregation. IC Role / Device Role / Timing Role: Aggregation switch performing port mirroring, VLAN tagging, and priority queuing for SLA enforcement. Use Value: Per-port bandwidth control enforces subscriber rate plans; IGMP forwarding enables efficient IPTV multicast delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Ethernet switch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Marvell 88E6093 | 16-port, 3.3 V, supports MII/RMII but lacks SS-SMII; includes integrated PHYs on select variants | Requires external PHYs for all ports; higher BOM cost but broader software ecosystem support | Preferred when PHY integration or Linux driver maturity outweighs pin-count savings |
| Realtek RTL8324M | 24-port, 3.3 V, supports MII only; no hardware VLAN tagging or broadcast storm filtering | Limited to basic unmanaged switching; no SMI register access or EEPROM boot configuration | Suitable for cost-sensitive, non-QoS applications where firmware configurability is not required |
Compared with Marvell 88E6093 and Realtek RTL8324M, ADM6918ABT1 uniquely delivers SS-SMII interface reduction, hardware-enforced broadcast storm mitigation, and EEPROM-driven headless boot - making it optimal for compact, autonomous edge switches where PCB real estate and deterministic startup are critical.
Availability
ADM6918ABT1 is available at Aetrix Electronics and suitable for industrial gateways, managed edge switches, network appliances, and telecom access nodes requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ADM6918ABT1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and communications controllers, with global R&D centers and ISO 9001-certified fabrication facilities.
The ADM6918/X product line was designed for cost-effective, low-power Ethernet switching in embedded networking equipment - emphasizing hardware acceleration, minimal external components, and flexible PHY interface options.
FAQ
Does ADM6918ABT1 support Gigabit Ethernet?
No. ADM6918ABT1 is strictly a 10/100 Mbps Fast Ethernet switch controller. It does not support 1000BASE-T or any Gigabit PHY interface modes. Its MII, RMII, and SS-SMII interfaces are defined only for 10 Mbps and 100 Mbps operation per IEEE 802.3u, with timing parameters verified up to 25 MHz (100 Mbps MII clock).
Can ADM6918ABT1 operate without an external EEPROM?
Yes. ADM6918ABT1 supports hardware strapping via pins EECS, EESK, EDI, and EDO to configure default settings (e.g., interface mode, CPU port assignment). However, EEPROM is required for persistent storage of learned MAC addresses, VLAN tables, and custom register configurations across power cycles.
What is the maximum packet size supported?
The ADM6918ABT1 supports jumbo frames up to 1536 bytes in "Length 1536 Mode" (enabled via register bit PCR_0[15]), exceeding the standard 1518-byte Ethernet frame. This mode is explicitly documented in Section 3.1.21 of the Rev 1.01 datasheet and validated in AC timing tests for MII and SS-SMII paths.
Is there Linux kernel driver support for ADM6918ABT1?
No vendor-maintained mainline Linux kernel driver exists for ADM6918ABT1. Infineon provided standalone BSP code (C libraries and register-level initialization sequences) in 2005, intended for integration into proprietary RTOS or bare-metal firmware. Modern Linux adoption would require custom DSA (Distributed Switch Architecture) driver development.
ADM6918ABT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 128-BFQFP
- Programmable:
- Not Verified
- Protocol:
- Ethernet
- Function:
- Controller
- Interface:
- Parallel
- Standards:
- 10/100 Base-T/TX PHY
- Voltage - Supply:
- 3.135V ~ 3.465V
- Current - Supply:
- -
- Operating Temperature:
- 0°C ~ 115°C
- Supplier Device Package:
- PG-FQFP-128-1
- Grade:
- -
- Qualification:
- -
ADM6918ABT1 FAQ
1.How can I place an order for ADM6918ABT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM6918ABT1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADM6918ABT1 reliable?
The price and inventory of ADM6918ABT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM6918ABT1 is usually 5 days.
3.What payment methods are accepted for ADM6918ABT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM6918ABT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM6918ABT1?
ADM6918ABT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM6918ABT1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADM6918ABT1?
For technical support, including ADM6918ABT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM6918ABT1 requirements.
6.How does Aetrix verify that ADM6918ABT1 is sourced from the original manufacturer or authorized distributors?
All ADM6918ABT1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADM6918ABT1 meets industry standards.
7.What is the process for return or replacement of ADM6918ABT1?
All ADM6918ABT1 units undergo pre-shipment inspection (PSI). If there is an issue with ADM6918ABT1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADM6918ABT1 part is unused and in its original packaging.
Return procedure for ADM6918ABT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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