Fujitsu's high-performance graphics system controller product integrates the "FR81S" high-performance CPU core, which is a single-chip solution that integrates various functions such as color display and video input and instrument control. This series of products can be applied to automotive dashboards. In addition to the MB91590 series that supports color LCD display, Fujitsu has also introduced the MB91570 series that supports segment LCD display.
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summary
The next-generation in-vehicle system will be applied to new control systems such as hybrid and electric vehicles, which require higher performance and higher functional integration of each control unit, and it is expected that the information display will be upgraded accordingly. These systems therefore require high-performance system controllers to be able to respond to real-time information from a variety of peripheral components and display information using a rich graphical interface. In addition, the market demand for displaying video information is expected to grow, and car photography opportunities are widely used to improve driving safety.
This time, Fujitsu introduced six "MB91590 Series" system chips for automotive applications, supporting automotive instrument panels (instrument panels) and in-vehicle HMI systems, integrating color display, video input and instrumentation control into a single chip. The series integrates the world-class high-performance CPU core "FR81S", the unique Sprite graphics display controller (GDC), graphics display memory (VRAM), and video capture for external input images in a single chip. And communication functions such as CAN and LIN. Since the conventional system is composed of a graphic display controller, a control MCU, and an external graphic display memory, the new product series reduces the cost and reduces the size of the chip package by reducing the peripheral circuit as compared with the conventional system. In addition, since the number of external connection buses of the noise generation source is reduced, the noise removing component is reduced, and the system can achieve high performance at a lower cost.
Figure 1 shows an example of a system architecture.
To ensure that researchers successfully apply these products to their designs, Fujitsu offers a development environment kit that includes the latest line-up on-chip debugger (simulator) and the integrated development environment SOFTUNEV6. In addition, Fujitsu also provides StarterKit and sample programs, graphic design tools and graphics libraries to facilitate designers who do not have the GDC-related knowledge embedded in the product to visualize the display design.
Table 1 shows the main development tools, and Figure 2 shows the development environment examples.
Characteristics
High-performance new 32-bit CPU core "FR81S"
The CPU core FR81S used in this product operates at a maximum internal operating frequency of 128MHz. The CAN embedded microcontroller provides world-class high-speed processing. In addition, this product also has a single-precision floating-point unit for filtering and high-speed image processing, and a memory protection unit that prevents external intrusion into the storage area.
Built-in NOR new flash architecture
The new product has a new NOR-type new flash architecture (NewFlasharchitecture) that improves the MCU processing power by utilizing the high-speed and low-power mode of the NOR flash memory to achieve high-speed reading of programs.
2D graphics rendering engine integrated inside the graphics display controller
In addition to advanced Sprite technology, including automatic flickering, motion, motion picture and anti-aliasing, the series also integrates many display functions for automotive dashboards, including internal video memory, line drawing, and area copying. In addition, the video capture function accepts video signals in digital YUB/RGB format and includes an NTSC decoder to process the analog video content. It scales the captured image and performs a 90-degree rotation. Since it can expand and display string length encoded images, video data can be processed with less memory capacity.
The video display function of this product has the following characteristics.
Sprite technology
The product is equipped with a Sprite engine that can display up to 512 512 x 512-point Sprite graphics.
In the conceptual diagram shown in FIG. 3, the priority can be displayed for each sprite.
Special sprite Figure 4 shows an overview of the functionality of a special Sprite. As shown in the figure, Blinking, AutoMovement, and ImageSwitching do not require CPU intervention.
Line drawing
It can be used in the parking assist system to draw lines of the image of the reversing camera and display it when displaying small screens such as dots and lines.
Figure 5 shows an example of line drawing.
String length coding
Since the video data is encoded in the length of the string, the capacity of the video memory is reduced.
Figure 6 shows an example of reducing video memory capacity.
Provides optimal peripheral functionality for automotive dashboard systems
For automotive dashboard systems, the product features a variety of peripheral functions including stepper motor controllers, debug signals and sound generators for alarms, and UARTs that support CAN and LIN, and is equipped with one capable of storing 64 messages. The buffer is suitable for supporting the control functions of the vehicle network. In addition, the product's built-in CR internal resonator, hardware monitor, and low-voltage detection circuitry minimizes the number of peripheral components required.
Figure 7 shows the functional block diagram (summary).
Low power function
This product is equipped with multiple built-in voltage regulators, eliminating the need for a color liquid crystal display. In low-power mode (accessory switch OFF), it is possible to perform a separate power-off only for the GDC circuit. In a low-power mode such as standby, the power supply in the non-operating circuit is turned off by the power gating technique, thereby achieving low power consumption (low leakage).
For products that use segmented liquid crystal display car dashboards
For the automotive dashboard with segmented liquid crystal display, Fujitsu introduced two "MB91570 series" products to realize design resource sharing. It removes the GDC part, has a built-in LCD controller, and other peripheral resources are the same as the MB91590 series. Therefore, in addition to the graphics functions, the software resources of the two series can be shared, which can reduce development costs.
summary
In the future, Fujitsu will continue to expand its product lineup for various automotive instrument panel needs (large screen, large capacity, super power saving, etc.) and continue to introduce better performance products.
Figure 8 shows the development roadmap for a 32-bit microcontroller for automotive dashboards.
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