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Texas Instruments SCANSTA101SM
- Part No.:
- SCANSTA101SM
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 49-LFBGA
- Datasheet:
-
SCANSTA101SM.pdf
- Description:
- IC INTERFACE SPECIALIZED 49BGA
- Quantity:
- Payment:
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Product details
Overview
SCANSTA101SM from Texas Instruments is an IEEE 1149.1 System Test Access (STA) Master IC designed to serve as a boundary-scan test controller in embedded and stand-alone JTAG systems. It features a 16-bit parallel processor interface, 2k × 32-bit dual-port memory, on-board sequencer, 32-bit LFSR for TDI signature compression, and operates at 3.3 V with 5 V–tolerant I/O - enabling integration into FPGA configuration and PCB-level structural test systems.
For engineers reviewing the SCANSTA101SM datasheet, SCANSTA101SM pinout, SCANSTA101SM application, or SCANSTA101SM equivalent, this device delivers deterministic scan vector execution, load-on-the-fly (LotF) and preloaded vector modes, hardware-accelerated BIST macro support, and register-based host control - critical for high-reliability manufacturing test and in-system programmable logic configuration.
Technical Context
The SCANSTA101SM implements a three-interface architecture centered on a 2048 × 32-bit dual-port memory: Parallel Processor Interface (PPI) for host CPU access, Serial Scan Interface (SSI) for IEEE 1149.1 TAP generation, and Test & Debug Interface supporting BIST, boundary scan, and internal scan. Its PPI supports asynchronous handshaking via STB/DTACK and includes dedicated registers for vector indexing, macro sequencing, and header/trailer management.
It executes IEEE 1149.1-compliant TCK_SM, TMS_SM, TDO_SM, and TDI_SM signals with precise timing (tD5 = 11.5 ns SCK-to-TCK_SM), integrates state, shift, and BIST macros for automated test mode selection, and uses a generic asynchronous processor interface compatible with multiple clock domains - including support for PCLK frequencies up to 66 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - ensures compatibility with modern 3.3 V logic systems while tolerating transient overvoltage conditions. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded test equipment and production floor environments. |
| Parallel Interface | 16-bit bidirectional data bus (D[15:0]) with address bus A[4:0], R/W, CE, STB, DTACK, and INT - enables direct microcontroller or FPGA host connection without glue logic. |
| Dual-Port Memory | 2k × 32-bit - provides dedicated buffer space for TDI/TDO data, expected results, mask patterns, vectors, macros, and sequencer instructions. |
| TAP Signal Timing | TCK_SM max frequency = 25 MHz; setup/hold times: TMS-to-TCK = 2.0/1.0 ns, TDI-to-TCK = 1.0/2.0 ns - guarantees reliable JTAG protocol compliance across target devices. |
| LFSR Engine | 32-bit linear feedback shift register at TDI port - performs real-time signature analysis of incoming scan data for fault detection without host CPU overhead. |
| Power-Down Mode | TRI-STATE outputs controlled by OE pin - allows full I/O isolation during system sleep or multi-device TAP sharing. |
Pinout & Package
SCANSTA101SM is packaged in a 49-pin NFBGA (5 mm × 5 mm, 0.8 mm pitch) with exposed thermal pad. Pin functions are validated per TI SNLS057J datasheet Rev. April 2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (4 pins) | Power supply | 3.3 V core supply; decoupling required per TI layout guidelines to maintain signal integrity during high-speed TAP operation. |
| GND (4 pins) | Ground reference | Low-inductance return path for digital and scan I/O; must be connected to solid ground plane beneath thermal pad. |
| D[15:0] | Bidirectional data bus | Primary 16-bit host interface; carries register reads/writes, memory transfers, and vector payloads between processor and SCANSTA101SM. |
| A[4:0] | Address bus | Selects among 32 internal registers and memory-mapped regions (TDO_SM, TDI_SM, Expected, Macro, Sequencer, etc.). |
| SCK | System clock input | Drives all internal timing; supports up to 66 MHz - determines maximum PPI throughput and DTACK response latency. |
| INT | Interrupt output | Active-low pulse signals completion of register write or status change; used for non-polling host synchronization. |
| OE | Output enable | Tri-states all _SM outputs (TDO_SM, TMS_SM, TCK_SM, TRST0_SM) - essential for shared JTAG bus arbitration. |
| TDI / TDO / TMS / TCK / TRST | JTAG boundary scan interface | Standard IEEE 1149.1 inputs/outputs; TRST tied to GND via 1 kΩ resistor for power-up reset stability. |
| TDI_SM / TDO_SM / TMS_SM / TCK_SM / TRST0_SM | STA Master scan interface | Generated JTAG signals driven to downstream DUTs; TRST0_SM provides synchronized test-reset to entire scan chain. |
Key Features
| Feature | Design Value |
|---|---|
| On-board sequencer | Executes multi-vector operations (e.g., FPGA configuration sequences) autonomously - eliminates host CPU intervention between vector loads. |
| Load-on-the-Fly (LotF) mode | Allows real-time streaming of test vectors from host memory into SCANSTA101SM's dual-port RAM during scan execution - reduces memory footprint and latency. |
| Hardware compare engine | Compares TDI_SM input against preloaded expected data in real time - flags mismatches via interrupt without software polling or post-processing. |
| 32-bit LFSR at TDI port | Performs signature compression on incoming serial data - enables compact pass/fail diagnostics for long scan chains without storing full response streams. |
| State, Shift, and BIST macros | Predefined instruction sets for common JTAG state transitions, shift cycles, and built-in self-test sequences - accelerate test program development and reduce firmware size. |
Applications
| PCB Manufacturing Test | FPGA In-System Configuration |
|---|---|
|
Use Scenario: Automated optical inspection (AOI) and flying probe test are insufficient for detecting solder shorts, opens, or misaligned BGAs on high-density boards. IC Role / Device Role / Timing Role: SCANSTA101SM acts as the boundary-scan controller, driving IEEE 1149.1 TAP signals to exercise interconnects and verify pin-level connectivity across populated components. Use Value: Enables 100% net continuity verification without physical probes - reducing test cycle time by >40% versus functional test alone and eliminating false failures from marginal analog margins. |
Use Scenario: Field-upgradable FPGAs require secure, reliable bitstream loading without exposing JTAG pins to external access or requiring dedicated programming hardware. IC Role / Device Role / Timing Role: SCANSTA101SM serves as embedded configuration master, generating compliant JTAG sequences to configure Xilinx or Intel FPGAs via their dedicated configuration ports. Use Value: Supports encrypted bitstream loading using preloaded vectors and mask-based comparison - prevents unauthorized reprogramming and ensures cryptographic integrity during boot. |
| Automated Test Equipment (ATE) | Multi-DUT JTAG Chain Management |
|
Use Scenario: Production-line ATE systems must validate complex SoC modules with mixed-voltage I/O and legacy JTAG interfaces under tight cycle-time constraints. IC Role / Device Role / Timing Role: SCANSTA101SM functions as a timing-deterministic STA master, synchronizing TCK_SM to host clock and buffering vectors in dual-port RAM to eliminate software jitter. Use Value: Guarantees sub-10 ns TCK edge alignment and deterministic vector launch - achieving <1 ppm test repeatability across temperature and voltage variations. |
Use Scenario: Rack-mounted test fixtures connect dozens of PCBs in daisy-chained JTAG topology, requiring dynamic isolation and selective reset of individual segments. IC Role / Device Role / Timing Role: SCANSTA101SM manages hierarchical scan bridges via its ScanBridge Support register set, enabling selective activation/deactivation of downstream TAP controllers. Use Value: Reduces chain length by >60% through on-the-fly bridge insertion - improving signal integrity, lowering TCK skew, and enabling concurrent testing of independent board sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar IEEE 1149.1 system test access applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Xilinx XA2V3200 | Integrated JTAG controller within Virtex-II Pro FPGA; no external memory or sequencer - relies on soft-core processor for vector management. | Requires FPGA fabric resources and custom firmware; lacks standalone operation or LotF capability. | Choose when JTAG control must be co-located with processing logic and board space is constrained. |
| Intellitech ScanPlus-100 | Dedicated STA master with 64-bit interface, 4 MB RAM, and USB/Ethernet host interface - higher bandwidth but larger footprint and proprietary API. | Designed for benchtop testers; not optimized for embedded integration or low-power operation. | Choose when high-volume vector streaming and remote diagnostics outweigh cost and size constraints. |
Compared with XA2V3200 and ScanPlus-100, SCANSTA101SM uniquely balances autonomous sequencer operation, 16-bit microcontroller compatibility, and minimal external component count - making it optimal for cost-sensitive, space-constrained embedded test nodes where deterministic timing and firmware simplicity are prioritized.
Availability
SCANSTA101SM is available at Aetrix Electronics and suitable for PCB manufacturing test, FPGA in-system configuration, automated test equipment (ATE), and multi-DUT JTAG chain management requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SCANSTA101SM 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 technologies, with decades of investment in test and debug infrastructure for programmable logic and SoC validation.
The SCANSTA101SM belongs to TI's System Test Access product line, engineered specifically to offload JTAG protocol generation and boundary-scan control from host processors - targeting high-reliability industrial, aerospace, and communications equipment where test repeatability and firmware determinism are mandatory.
FAQ
What is the primary function of the SCANSTA101SM in a JTAG test system?
The SCANSTA101SM functions as an IEEE 1149.1 System Test Access (STA) Master, generating compliant TCK_SM, TMS_SM, TDO_SM, and TDI_SM signals to control downstream boundary-scan devices. It relieves the host processor of real-time JTAG timing responsibilities by executing preloaded or streamed vectors autonomously via its on-board sequencer and dual-port memory - ensuring deterministic test execution in SCANSTA101SM-based systems.
Does the SCANSTA101SM support both 16-bit and 32-bit host interfaces?
The SCANSTA101SM implements a native 16-bit parallel processor interface (D[15:0], A[4:0]) with full register and memory mapping. While its internal dual-port memory is 32-bit wide and the IP macro version supports 32-bit expansion (D[31:16]), the packaged SCANSTA101SM device does not bond out D[31:16] pins - confirming that only 16-bit operation is physically supported in the SCANSTA101SM NFBGA package.
How does the SCANSTA101SM handle test result validation during scan operations?
The SCANSTA101SM performs real-time hardware comparison of incoming TDI_SM data against preloaded expected values stored in its dual-port memory. When a mismatch occurs, it asserts the INT pin and updates the Status Register - enabling immediate host response without software polling. This capability is implemented entirely in hardware and is active in both Load-on-the-Fly and preloaded vector modes for SCANSTA101SM deployments.
What is the role of the 32-bit LFSR in the SCANSTA101SM architecture?
The 32-bit linear feedback shift register (LFSR) in the SCANSTA101SM compresses serial test response data received at the TDI port into a compact signature. This allows rapid pass/fail evaluation of long scan chains without storing full response streams - reducing memory bandwidth requirements and accelerating diagnostics. The LFSR result is accessible via LSB/MSB result registers and supports signature analysis for SCANSTA101SM-based production test systems.
Can the SCANSTA101SM operate in systems with mixed-voltage JTAG targets?
Yes - the SCANSTA101SM features 5 V–tolerant I/O on all JTAG and parallel interface pins while operating from a 3.3 V supply. This allows direct interfacing with legacy 5 V JTAG targets (e.g., older CPLDs or microcontrollers) without level-shifting circuitry. Its VIH/VIL thresholds (2.1 V/0.8 V) and output drive strength (24 mA) are specified to ensure robust signaling across voltage domains in SCANSTA101SM implementations.
SCANSTA101SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 49-LFBGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Applications:
- Testing Equipment
- Interface:
- IEEE 1149.1
- Voltage - Supply:
- 3V ~ 3.6V
- Supplier Device Package:
- 49-NFBGA (7x7)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
SCANSTA101SM FAQ
1.How can I place an order for SCANSTA101SM through Aetrix?
Please submit a Request for Quotation (RFQ) for SCANSTA101SM 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 SCANSTA101SM reliable?
The price and inventory of SCANSTA101SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCANSTA101SM is usually 5 days.
3.What payment methods are accepted for SCANSTA101SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCANSTA101SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCANSTA101SM?
SCANSTA101SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCANSTA101SM 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 SCANSTA101SM?
For technical support, including SCANSTA101SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCANSTA101SM requirements.
6.How does Aetrix verify that SCANSTA101SM is sourced from the original manufacturer or authorized distributors?
All SCANSTA101SM 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 SCANSTA101SM meets industry standards.
7.What is the process for return or replacement of SCANSTA101SM?
All SCANSTA101SM units undergo pre-shipment inspection (PSI). If there is an issue with SCANSTA101SM, 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 SCANSTA101SM part is unused and in its original packaging.
Return procedure for SCANSTA101SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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