STMicroelectronics FL-101

Overview

FL-101 from STMicroelectronics is a JTAG interface adapter that bridges a standard PC parallel port to one or more PSD813F programmable system devices on a target board, supporting IEEE 1149.1 and WSI-enhanced JTAG (EJTAG) protocols with TCK, TMS, TDI, TDO, TSTAT, and TERR signals, operating from 2.7V to 5.5V supplied by the target system, and used for in-system programming and functional testing of Flash-based embedded controllers.

For engineers reviewing the FL-101 datasheet, FL-101 pinout, FL-101 application, or FL-101 equivalent, this adapter enables reliable JTAG communication between legacy PCs and ST's PSD813F devices-especially where parallel-port-based ISP, production-line flash programming, or lab-level boundary-scan validation is required without USB or dedicated debug hardware.

Technical Context

The FL-101 implements a synchronous, level-shifted JTAG bridge using dual 74VHC240 octal buffers and 74AC05 inverters to condition and isolate signals between the PC parallel port and target PSD813F devices. It supports both basic IEEE 1149.1 compliance and enhanced EJTAG features including TSTAT (programming status) and TERR (programming error) reporting.

All signal grounds are internally tied together, and six core pins (TCK, TMS, TDI, TDO, VCC, GND) are mandatory; optional pins (TRST, RST, JEN, CNTL, TSTAT, TERR) extend functionality for chain reset, target reset, JTAG enable control, and real-time ISP monitoring-enabling flexible integration into test fixtures and production programmers.

Key Specifications

Availability

FL-101 is available at Aetrix Electronics and suitable for in-system programming, JTAG boundary-scan validation, and production flash programming requiring stable component supply, repeatable lab setup, and legacy PC-based toolchain continuity.

Supply support for FL-101 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power management, and memory solutions for automotive, industrial, and consumer applications.

The FL-101 belongs to ST's legacy Flash+PSD programming tool ecosystem, developed specifically to support in-circuit programming and debugging of PSD813F programmable system devices using cost-effective, widely available PC hardware.

FAQ

Does FL-101 require external power or drivers?

No. FL-101 draws all operating power (2.7–5.5 V) directly from the target board's VCC rail and uses standard PC parallel port signaling-no external power supply, USB converter, or proprietary driver installation is needed. It relies on native Windows parallel port I/O via PSDsoft software.

Can FL-101 program multiple PSD813F devices in a JTAG chain?

Yes. FL-101 supports daisy-chained JTAG configurations: TDO of one PSD813F connects to TDI of the next, with shared TCK, TMS, and TMS signals. The schematic and chaining example in the user manual confirm straight-through ribbon cable compatibility for multi-device ISP.

What is the role of the loopback connector included with FL-101?

The included loopback connector validates end-to-end JTAG signal integrity by shorting TDO to TDI and TMS to TCK internally, allowing PSDsoft to verify PC–FlashLink–cable connectivity before connecting to any target board-critical for troubleshooting intermittent parallel-port or cable faults.

Is FL-101 compatible with modern Windows OS versions?

FL-101 was designed for Windows 95/98/NT/2000-era parallel port access. On modern Windows (10/11), it requires legacy parallel port hardware (not USB-to-parallel adapters) and may need signed driver exemptions or virtual machine environments running compatible OS versions with PSDsoft Express.