Texas Instruments TNETX3150GGP

Overview

TNETX3150GGP from Texas Instruments is a 15-port shared-memory Ethernet switch IC supporting 12×10-Mbit/s, 2×10-/100-Mbit/s, and 1×10-/100-/200-Mbit/s MAC interfaces. It implements cut-through and store-and-forward switching, full-duplex operation on all ports, VLAN support, and integrated RMON/EtherStat statistics collection. It enables low-cost desktop switching solutions when paired with external EDO DRAM and PHY devices.

For engineers reviewing the TNETX3150GGP datasheet, TNETX3150GGP pinout, TNETX3150GGP application, or TNETX3150GGP equivalent, key selection considerations include its 352-pin BGA package, 5-V-tolerant I/Os, JTAG compliance (with external pullups), EEPROM auto-configuration capability, and support for both MII and SNI physical layer interfaces.

Technical Context

The TNETX3150GGP integrates 15 independent MAC blocks - twelve 10-Mbit/s SNI ports (03–14), two 10-/100-Mbit/s MII/SNI ports (01–02), and one 10-/100-/200-Mbit/s uplink port (00) with bidirectional tagging and flow control. Its queue manager supports round-robin arbitration and per-port RX/TX FIFO buffering.

Switching logic uses internal address compare, external address match (EAM), or frame tagging for forwarding decisions. The DRAM controller supports 60-ns EDO DRAM with page-burst access, and the DIO interface provides direct register-level access to port statistics, control registers, and memory-mapped configuration space.

Key Specifications

Pinout & Package

Packaged in a 352-pin plastic ball grid array (PBGA), GGP package, with solder balls arranged in a 23×23 array (excluding corner blanks). Pinout organized by functional interface groups: 10-Mbit/s MAC (ports 03–14), 10-/100-Mbit/s MAC (ports 01–02), 10-/100-/200-Mbit/s uplink (port 00), DRAM, EEPROM, DIO, LED, JTAG, EAM, and NMON.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Ethernet switch applications.

Compared with Marvell 88E6093 and Intel NS32FX165, the TNETX3150GGP uniquely combines a 200-Mbit/s uplink, EDO DRAM optimization, and EEPROM auto-configuration-making it optimal for cost-sensitive, standalone desktop switches where PHY flexibility and minimal firmware overhead are critical.

Availability

TNETX3150GGP is available at Aetrix Electronics and suitable for enterprise desktop switching, industrial Ethernet hub replacement, multi-tenant building network nodes, and embedded network appliance bridging requiring stable component supply and long-term obsolescence planning.

Supply support for TNETX3150GGP 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

Texas Instruments is a global semiconductor leader focused on analog, embedded processing, and connectivity technologies, with deep expertise in networking silicon dating to the 1990s.

The TNETX3150GGP belongs to TI's ThunderSWITCH family-designed specifically for low-cost, high-integration Ethernet switching in standalone desktop and embedded applications where CPU offload, EEPROM configurability, and flexible PHY interfacing are essential.

FAQ

What is the maximum supported DRAM capacity for the TNETX3150GGP?

The TNETX3150GGP supports up to 2 MB of EDO DRAM via its 16-bit data bus and 13-bit address bus (DRAM_ADDR[12:0]). The RAM Size Register (address 0x31) reports actual configured size during initialization, and system performance scales with memory bandwidth-not just capacity-so 60-ns timing compliance is mandatory for full-port concurrency.

Does the TNETX3150GGP support IEEE 802.1Q VLAN tagging?

Yes, the TNETX3150GGP supports VLAN functionality through two mechanisms: internal VLAN registers for single-address-per-port broadcast/multicast control, and the External Address Match (EAM) interface for hardware-assisted VLAN classification based on tag fields. However, it does not perform IEEE 802.1Q frame insertion/stripping in hardware-the uplink port 00 handles tagged frames transparently when enabled via port control registers.

Can the TNETX3150GGP operate without an external microcontroller?

Yes, the TNETX3150GGP supports full autonomous operation using EEPROM auto-configuration (e.g., x24C02). Upon power-up, it loads port settings, VLAN maps, and system control values directly from EEPROM-enabling true "zero-software" desktop switch implementations with no CPU, firmware, or boot sequence required.

What are the key differences between the TNETX3150GGP and TNETX3150A variant?

The TNETX3150GGP and TNETX3150A share identical functionality, pinout, and electrical specifications. The 'A' suffix denotes a revised silicon revision released in September 1997, incorporating minor timing and reliability enhancements-but no architectural or feature changes. Both are drop-in compatible, and the GGP package designation applies identically to both versions.

How does cut-through switching behave across different port speed combinations on the TNETX3150GGP?

Cut-through is permitted only when egress port speed ≤ ingress port speed: a 100-Mbit/s port can cut through to another 100-Mbit/s or 10-Mbit/s port, but a 10-Mbit/s port cannot cut through to a 100-Mbit/s port (store-and-forward is enforced automatically). Uplink port 00 (200-Mbit/s) supports cut-through to any lower-speed port, reducing latency for time-sensitive traffic like VoIP or industrial control packets.