Texas Instruments TSB43AB23PDT

Overview

TSB43AB23PDT from Texas Instruments is a PCI-based 1394a-2000 OHCI-compliant PHY/link-layer controller IC integrating three FireWire ports, supporting S100/S200/S400 data rates (100/200/400 Mbit/s), 33-MHz PCI bus interface, IEEE 1394a power-down modes, and hardware-accelerated DV/MPEG isochronous timestamping for digital video systems.

For engineers reviewing the TSB43AB23PDT datasheet, TSB43AB23PDT pinout, TSB43AB23PDT application, or TSB43AB23PDT equivalent, this device serves as a full-featured host-side FireWire controller for embedded PC add-in cards, digital camcorder docking stations, and industrial vision systems requiring deterministic isochronous streaming and low-latency PCI-to-1394 bridging.

Technical Context

The TSB43AB23PDT implements a dual-layer architecture: an integrated OHCI-compliant link-layer controller (LLC) with memory-mapped registers and a three-port PHY layer featuring differential transceivers for TP-A/TP-B twisted-pair signaling. It uses an internal PLL locked to a 24.576-MHz crystal to generate 49.152-MHz system clock and 393.216-MHz reference for S400 encoding.

Its PCI interface supports D0–D3 power states per PCI Power Management 1.1, burst transfers up to 132 MB/s, and non-prefetchable memory-mapped OHCI register access. The PHY provides automatic cable bias detection, port arbitration logic, and hardware timestamp insertion/stripping for IEC 61883-1 CIP packets in DV and MPEG streams.

Key Specifications

Pinout & Package

Packaged in a 128-pin LQFP (PDT package), the TSB43AB23PDT features dedicated PCI address/data/control pins, three sets of TP-A/TP-B differential I/O pairs, TPBIAS outputs per port, GPIOs, and power/ground terminals optimized for EMI-sensitive FireWire signal integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1394 host controller applications.

Compared with TSB43AB23PDT, TSB43AB22PDT reduces port count and feature set for lower BOM cost, while VT6306-LF offers dual-port functionality with broader motherboard driver support but lacks hardware-accelerated DV timestamping critical for professional video workflows.

Availability

TSB43AB23PDT is available at Aetrix Electronics and suitable for digital video capture systems, industrial machine vision nodes, and embedded PC add-in cards requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production programs.

Supply support for TSB43AB23PDT 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 specializing in analog, embedded processing, and connectivity solutions, with decades of leadership in interface and real-time communication ICs.

The TSB43AB23PDT belongs to TI's 1394 FireWire controller product line, engineered specifically for high-reliability, low-jitter isochronous data transport in professional digital video, industrial automation, and embedded computing applications.

FAQ

What is the primary function of the TSB43AB23PDT in a FireWire system?

The TSB43AB23PDT serves as a PCI-based OHCI-compliant 1394a host controller, integrating both link-layer control and three-port PHY functionality. It bridges the 33-MHz PCI bus to the 1394 serial bus at S100/S200/S400 speeds, manages isochronous and asynchronous traffic, and handles physical layer signaling including cable bias, arbitration, and hot-plug detection. Its design enables direct integration into add-in cards and embedded systems requiring full FireWire host capability.

Does the TSB43AB23PDT require an external crystal, and what frequency is needed?

Yes, the TSB43AB23PDT requires a 24.576-MHz fundamental-mode crystal connected to XI/XO pins. This crystal serves as the reference for an internal PLL that generates the 49.152-MHz clock for the link-layer controller and the 393.216-MHz reference for S400 encoding. An external clock source may substitute the crystal, but the 24.576-MHz frequency is mandatory to maintain timing compliance with IEEE 1394a and OHCI specifications.

How does the TSB43AB23PDT support digital video applications like DV and MPEG streaming?

The TSB43AB23PDT includes TI-specific hardware enhancements accessible via the isochronous receive digital video enhancements register (OHCI offset A88h). These provide automatic insertion of synchronization timestamps into transmitted DV/MPEG CIP packets and stripping of CIP headers from received streams - both synchronized to the internal cycle timer. This offloads real-time packet manipulation from the host CPU and ensures sub-125-µs isochronous jitter required for broadcast-quality video transport.

What power management features does the TSB43AB23PDT support?

The TSB43AB23PDT complies with PCI Bus Power Management Interface Specification 1.1 and supports D0 (fully on), D1 (light sleep), D2 (deep sleep), and D3 (off) states. In ultralow-power sleep mode - activated when all ports are disconnected/disabled and LPS bit is cleared - it disables internal clocks and reference circuits while retaining TPBIAS monitoring capability. Wake-up occurs within 2 ms of setting LPS=1 or detecting port activity, meeting Intel Mobile Power Guideline 2000 requirements.

Can the TSB43AB23PDT be used in systems requiring more than one 1394 port?

Yes, the TSB43AB23PDT integrates three fully independent 1394 ports (TPA0/TPB0, TPA1/TPB1, TPA2/TPB2), each with dedicated TPBIAS output and arbitration logic. This enables native support for daisy-chain, star, or redundant topologies without external repeaters. Each port operates autonomously, allowing simultaneous isochronous streams (e.g., multiple cameras) or failover configurations in mission-critical industrial systems - a key differentiator versus dual-port alternatives like VT6306-LF.