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Texas Instruments TSB42AA9PZT
- Part No.:
- TSB42AA9PZT
- Manufacturer:
- Texas Instruments
- Category:
- Controllers
- Package:
- -
- Datasheet:
-
TSB42AA9PZT.pdf
- Description:
- SERIAL I/O CONTROLLER
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Product details
Overview
TSB42AA9PZT from Texas Instruments is a IEEE 1394a Link Layer Controller implementing SBP-2 transport protocol engine, ATA/ATAPI bridge (supporting PIO 0–4, DMA 0–2, Ultra DMA 0–4), and embedded 8052 processor with 16 KB internal ROM. It operates at 100/200/400 Mbps serial bus rates and targets external storage devices including HDDs, CD/DVD drives, and MO/ORB drives connected via FireWire.
For engineers reviewing the TSB42AA9PZT datasheet, TSB42AA9PZT pinout, TSB42AA9PZT application, or TSB42AA9PZT equivalent, this device serves as a native 1394-to-ATA/ATAPI bridge requiring no host CPU intervention for SBP-2 command translation or DMA setup - critical for low-latency, embedded storage target designs.
Technical Context
The TSB42AA9PZT integrates an IEEE P1394a-compliant link core with CSR registers mapped to FFFF F000 0000h, supporting asynchronous-only operation (no isochronous support) and enhanced priority arbitration via PRIORITY_BUDGET register (pri_max = 3Fh). It implements hardware-based SBP-2 management and command agents, offloading full protocol handling from host systems.
ATA/ATAPI interface timing complies with ANSI NCITS 317-1998 (ATA/ATAPI-5 v3.0); data path uses bidirectional 16-bit DD[15:0] bus with DIOR/DIOW strobes and IORDY flow control. Configuration ROM is loaded via 2-wire SDA/SCL (100 kHz) into 576-byte parameter RAM for fast quadlet/block read responses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface Standard | IEEE P1394a and IEEE Std 1394-1995 compliant; supports 100/200/400 Mbps serial bus rates |
| ATA/ATAPI Support | Full PIO modes 0–4, DMA modes 0–2, Ultra DMA modes 0–4 per ANSI NCITS 317-1998 |
| Embedded Processor | 8052 core executing firmware from 16 KB internal ROM or optional external Flash PROM/EPROM |
| FIFO Capacity | 576-byte transmit control FIFO, 576-byte receive control FIFO, and bidirectional data FIFO |
| Configuration Memory | Internal parameter RAM (128 quadlets) for fast access to SBP-2 parameters and automatic CSR responses |
| Package | 100-pin TQFP (PZT), 0.5 mm pitch, RoHS-compliant lead-free finish |
| Supply Voltage | 3.3 V ± 0.3 V core supply; integrated 1.8 V regulator (REG18_1/REG18_2) with EN control |
Pinout & Package
TSB42AA9PZT is housed in a space-saving 100-pin Thin Quad Flat Package (TQFP, suffix PZT), measuring 14 mm × 14 mm × 1.4 mm, with 0.5 mm lead pitch and exposed thermal pad. Pin assignments follow TI's standardized top-view layout with dedicated power/ground distribution, dual-bus separation (ATA/ATAPI + Flash), and reserved test pins (RSVD, TSTMODE, SCANEN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DD[15:0] | ATA/ATAPI bidirectional data bus | 16-bit wide interface for PIO/DMA/Ultra DMA transfers; DD15 = MSB, supports both 8- and 16-bit register access |
| DA[2:0] | ATA/ATAPI device address outputs | 3-bit binary address for command block register selection (e.g., Data, Error, Sector Count) |
| DIOR / DIOW | ATA/ATAPI strobe controls | Active-low read/write strobes defining data direction and latching edges; required for all PIO modes ≥3 |
| IORDY | ATA/ATAPI ready input | Flow-control signal extending transfer cycles when device is not ready; mandatory for PIO modes 3–4 and Ultra DMA |
| D[7:0] / CTL[1:0] | 1394 PHY-link data/control bus | 8-bit bidirectional data bus (D7–D0) and 2-bit control bus (CTL1/CTL0) for 100/200/400 Mbps packet framing |
| SDA / SCL | 2-wire serial EEPROM interface | Open-drain SDA and push-pull SCL at 100 kHz for loading IEEE 1394 configuration ROM into parameter RAM |
| ADDR[13:0] / AD[7:0] | External Flash PROM/EPROM interface | 14-bit address + 8-bit bidirectional data bus with separate CS/OE_RD/WE controls; no external latches required |
| RESET | Power-on reset input | Active-low asynchronous reset for entire device; initiates internal initialization and firmware boot sequence |
Key Features
| Feature | Design Value |
|---|---|
| Hardware SBP-2 engine | Full transport layer implementation eliminates host CPU involvement in command parsing, status reporting, and data routing |
| Integrated 8052 + 16 KB ROM | On-chip microcontroller executes firmware for ATA/ATAPI command translation and SBP-2 state machine management |
| Parameter RAM (128 quadlets) | Enables zero-latency response to IEEE 1394 configuration ROM read requests without external memory access |
| Separate Flash interface | Dedicated ADDR/AD busses with CS/OE_RD/WE allow in-system reprogramming of firmware without socketed parts |
| Asynchronous-only 1394 mode | Omits isochronous resource manager logic, reducing gate count and simplifying certification for storage-target applications |
Applications
| External Hard Disk Enclosures | CD/DVD Drive Adapters |
|---|---|
|
Use Scenario: FireWire-enabled external HDD enclosure connecting 2.5" or 3.5" SATA/IDE drives to Mac OS or Windows PCs. IC Role / Device Role / Timing Role: Native SBP-2 target controller translating FireWire packets to ATA commands and managing DMA transfers between host and drive. Use Value: Enables plug-and-play hot-swap storage with guaranteed 400 Mbps peak bandwidth and deterministic interrupt latency under SBP-2 protocol. |
Use Scenario: Standalone FireWire-to-CD-ROM adapter enabling legacy optical drives on modern FireWire-equipped workstations. IC Role / Device Role / Timing Role: ATA/ATAPI bridge with built-in INQUIRY/READ CAPACITY/READ/WRITE command support per SCSI command set mapping. Use Value: Eliminates need for host-side drivers by providing full SBP-2 compliance and automatic configuration ROM responses per IEEE 1394-1995. |
| Magneto-Optical (MO) Storage Systems | ORB Drive Docking Stations |
|
Use Scenario: Industrial MO drive dock used in broadcast archiving systems requiring reliable FireWire connectivity and long-term media compatibility. IC Role / Device Role / Timing Role: Low-jitter 1394 link controller with hardware CRC generation and error-checked packet reception for mission-critical data streaming. Use Value: Ensures bit-accurate data transfer over FireWire using hardware-accelerated SBP-2 transport and PIO mode 4 timing margins. |
Use Scenario: Desktop ORB drive docking station supporting high-speed backup and media interchange across heterogeneous FireWire platforms. IC Role / Device Role / Timing Role: Dual-role ATA/ATAPI interface handling both packetized (ATAPI) and non-packetized (ATA) command sets with automatic protocol detection. Use Value: Delivers seamless interoperability with Mac OS X and Windows FireWire stacks via certified SBP-2 target behavior and vendor-unique configuration ROM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 1394-to-ATA/ATAPI bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSB42AA9PZ | Same die, identical functionality, but packaged in 100-pin LQFP (PZ) instead of TQFP (PZT); slightly larger footprint (14 × 14 mm vs. 14 × 14 mm same size but different lead form) | LQFP variant may simplify hand-soldering or legacy PCB rework where TQFP reflow profile is unavailable | Select TSB42AA9PZ only if board-level thermal constraints favor LQFP or existing assembly lines lack TQFP reflow capability |
| TSB42AA10PZT | Successor device with extended Ultra DMA support (modes 0–5), added USB 2.0 host interface, and updated SBP-2 firmware; pin-compatible but requires revised configuration ROM | Supports newer high-speed ATAPI devices (e.g., DVD-RAM, Blu-ray) requiring Ultra DMA Mode 5 timing and dual-interface flexibility | Choose TSB42AA10PZT only when upgrading for higher throughput or multi-interface requirements; not drop-in compatible due to ROM and CSR map changes |
Compared with TSB42AA9PZT, the TSB42AA9PZ offers identical electrical and functional behavior in LQFP packaging, while TSB42AA10PZT extends performance and interface options at the cost of firmware and configuration ROM updates - making TSB42AA9PZT optimal for stable, cost-sensitive FireWire storage targets.
Availability
TSB42AA9PZT is available at Aetrix Electronics and suitable for external hard disk enclosures, CD/DVD drive adapters, magneto-optical storage systems, and ORB drive docking stations requiring stable component supply and long-term FireWire 1394a compliance.
Supply support for TSB42AA9PZT 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 expertise in high-speed interface ICs and industrial-grade reliability.
The TSB42AA9PZT belongs to TI's StorageLynx family of IEEE 1394 link-layer controllers, designed specifically to enable robust, standards-compliant FireWire storage target devices without host CPU overhead.
FAQ
What is the primary function of the TSB42AA9PZT in a FireWire storage system?
The TSB42AA9PZT acts as a native IEEE 1394a Link Layer Controller and SBP-2 transport protocol engine, bridging FireWire (1394) packets to ATA/ATAPI commands for storage devices. It handles command translation, DMA setup, and configuration ROM responses autonomously using its embedded 8052 processor and hardware accelerators - eliminating host CPU involvement in data transfers. This makes TSB42AA9PZT ideal for self-contained external storage enclosures.
Does the TSB42AA9PZT support isochronous data transfer for audio/video streaming?
No, the TSB42AA9PZT does not support isochronous transactions. Its IEEE 1394a link core implements only asynchronous packet handling and omits Bus Manager, Cycle Master, and Isochronous Resource Manager (IRM) logic. The device is optimized exclusively for storage-target applications using SBP-2, with all timing and CSR registers aligned to asynchronous-only operation per IEEE Std 1394-1995 and P1394a.
How is configuration ROM loaded into the TSB42AA9PZT at power-up?
The TSB42AA9PZT loads IEEE 1394 configuration ROM data from an external 2-wire serial EEPROM via SDA (pin 23) and SCL (pin 24) at 100 kHz. This data is written into the internal parameter RAM (128 quadlets), enabling fast, zero-latency responses to configuration ROM read requests from the FireWire host. No external microcontroller is needed - the process is fully autonomous and occurs during device initialization.
Can the TSB42AA9PZT operate with both 8-bit and 16-bit ATA/ATAPI devices?
Yes, the TSB42AA9PZT supports both 8-bit and 16-bit ATA/ATAPI interfaces through its bidirectional DD[15:0] data bus. For 8-bit operation, only DD[7:0] is used during register transfers; for 16-bit transfers (required for PIO modes 3–4 and all Ultra DMA modes), the full 16-bit width is engaged. DA[2:0], DIOR, DIOW, and IORDY signals remain functionally identical across both configurations.
What external memory options does the TSB42AA9PZT support for firmware updates?
The TSB42AA9PZT supports external firmware storage via its dedicated Flash PROM/EPROM interface: 14-bit ADDR[13:0], 8-bit AD[7:0], active-low CS, OE_RD, and WE signals. It allows in-system programming without sockets - enabling field firmware upgrades for custom SBP-2 behaviors or ATA timing adjustments. Internal 16 KB ROM remains the default boot source unless external memory is explicitly enabled via MODE0/MODE1 configuration.
TSB42AA9PZT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- -
- Programmable:
- Not Verified
- Protocol:
- -
- Function:
- -
- Interface:
- -
- Standards:
- -
- Voltage - Supply:
- -
- Current - Supply:
- -
- Operating Temperature:
- -
- Supplier Device Package:
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- Grade:
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- Qualification:
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TSB42AA9PZT FAQ
1.How can I place an order for TSB42AA9PZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TSB42AA9PZT 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 TSB42AA9PZT reliable?
The price and inventory of TSB42AA9PZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSB42AA9PZT is usually 5 days.
3.What payment methods are accepted for TSB42AA9PZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSB42AA9PZT transactions.
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4.How is shipping managed for TSB42AA9PZT?
TSB42AA9PZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSB42AA9PZT 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 TSB42AA9PZT?
For technical support, including TSB42AA9PZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSB42AA9PZT requirements.
6.How does Aetrix verify that TSB42AA9PZT is sourced from the original manufacturer or authorized distributors?
All TSB42AA9PZT 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 TSB42AA9PZT meets industry standards.
7.What is the process for return or replacement of TSB42AA9PZT?
All TSB42AA9PZT units undergo pre-shipment inspection (PSI). If there is an issue with TSB42AA9PZT, 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 TSB42AA9PZT part is unused and in its original packaging.
Return procedure for TSB42AA9PZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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