Renesas SLG47910V-SKT

Overview

SLG47910V-SKT from Renesas Electronics is a ForgeFPGA programmable logic device configured as the timing and computation core of a ballistic chronograph, measuring object speed from 1 m/s to 1500 m/s with ±1 m/s accuracy. It accepts two asynchronous trigger inputs (GPIO16_IN, GPIO18_IN), implements a 50 MHz internal oscillator-based time-of-flight counter, performs real-time binary-to-BCD conversion, and drives a four-digit common-cathode seven-segment display via GPIO outputs.

For engineers reviewing the SLG47910V-SKT datasheet, SLG47910V-SKT pinout, SLG47910V-SKT application, or SLG47910V-SKT equivalent, this page details its verified role in high-precision time-interval measurement systems, FPGA resource utilization (CLB/FF mapping), dynamic display control logic, and integration with GreenPAK sensor front-ends for optical flight detection.

Technical Context

The SLG47910V-SKT implements a deterministic 7-state finite state machine (FSM) that sequences initialization, idle wait, start/stop edge capture, time validation against max-speed threshold (1500 m/s), iterative subtraction-based speed calculation, BCD conversion enablement, and post-measurement hold timing. Its internal 50 MHz oscillator provides the timebase for sub-microsecond resolution timing.

All I/O is configured for specific roles: GPIO16_IN and GPIO18_IN are dedicated trigger inputs with fixed OE = 0; eight GPIOs drive seven-segment anodes (a–dp) with 2× push-pull output strength; four GPIOs control digit cathodes; and internal OSC_CTRL_EN and POR signals are hardwired active-high.

Key Specifications

Pinout & Package

SLG47910V-SKT is housed in a 20-pin QFN package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are fixed per the Ballistic Chronograph reference design and cannot be remapped in this configuration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FPGA-based timing and display control applications.

Compared with SLG47910V-SKT, SLG47900V lacks the integrated 50 MHz oscillator and half the logic resources, limiting its standalone timing accuracy and range; the iCE40UP5K offers greater scalability but introduces BOM complexity and configuration overhead absent in the pre-validated SLG47910V-SKT chronograph implementation.

Availability

SLG47910V-SKT is available at Aetrix Electronics and suitable for ballistic measurement systems, high-speed industrial timing instrumentation, and embedded FPGA-based sensor interface modules requiring stable component supply and long-term design continuity.

Supply support for SLG47910V-SKT 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

Renesas Electronics is a global semiconductor manufacturer headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and programmable logic solutions for industrial, automotive, and consumer applications.

The SLG47910V-SKT belongs to the ForgeFPGA family - low-density, non-volatile FPGAs designed for rapid prototyping and cost-sensitive embedded logic replacement, with emphasis on sensor interfacing, timing control, and display driving without external memory or configuration devices.

FAQ

What is the primary function of the SLG47910V-SKT in the ballistic chronograph reference design?

The SLG47910V-SKT serves as the central timing and computation unit in the ballistic chronograph, capturing the time interval between two optical sensor triggers, calculating object speed using integer arithmetic, and directly driving a four-digit seven-segment display. Its internal 50 MHz oscillator and deterministic FSM eliminate reliance on external controllers, making SLG47910V-SKT the autonomous core of the measurement system.

Does the SLG47910V-SKT require external programming hardware or configuration memory?

No, the SLG47910V-SKT uses non-volatile configuration memory and is programmed via the Go Configure Software Hub using a standard USB connection - no external programmers, JTAG adapters, or configuration PROMs are needed. The design files (.ffpga) for the ballistic chronograph are provided by Renesas and can be loaded directly into SLG47910V-SKT, making SLG47910V-SKT field-reprogrammable without hardware changes.

How does the SLG47910V-SKT achieve ±1 m/s measurement accuracy across 1–1500 m/s?

The SLG47910V-SKT achieves ±1 m/s accuracy through deterministic 20 ns timebase resolution (50 MHz oscillator), validated FSM sequencing that eliminates metastability, and integer-based speed calculation using iterative subtraction - avoiding floating-point errors or division latency. The SLG47910V-SKT's fixed 30 cm sensor spacing and calibrated clock frequency ensure repeatability, with accuracy confirmed across real-world tests from 5.4 m/s to 980 m/s.

Can the SLG47910V-SKT drive a seven-segment display without external transistors or drivers?

Yes, the SLG47910V-SKT GPIOs are configured as 2× push-pull outputs capable of directly sourcing/sinking sufficient current for common-cathode seven-segment LEDs. In the reference design, SLG47910V-SKT drives eight anode lines (a–dp) and four cathode digit selects without external drivers - confirmed by resistor values (20 Ω series) and brightness validation in prototype testing.

Is the SLG47910V-SKT pin-compatible with other ForgeFPGA devices like SLG47900V?

No, SLG47910V-SKT is not pin-compatible with SLG47900V. While both use 20-pin QFN packages, their pin functions differ significantly - SLG47910V-SKT reserves GPIO16_IN and GPIO18_IN for dedicated trigger inputs and configures eight GPIOs for anode drive, whereas SLG47900V allocates pins differently due to fewer resources and no integrated oscillator. Migration requires PCB redesign and logic re-synthesis, so SLG47910V-SKT must be treated as a distinct part number.