Also known as:
- Cirrus Logic GD7541 (Nordic Light)
Description:
Overview
The GD7541 and GD7543 are single-chip Super VGA LCD controllers designed for portable computers, offering design flexibility, high performance, multimedia capabilities, and power management features. The key features include:
Features
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GUI Acceleration:
- BitBLT (bit block transfer) engine
- Color expansion for 8- or 16-bit pixels
- True packed-pixel addressing
- Programmable linear memory addressing
- 32x32 or 64x64 hardware cursor
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Multimedia Acceleration and Enhancement:
- 8-bit feature connector port for video overlay
- Interface to analog encoders for NTSC/PAL-out
- MotionVideo Acceleration (MVA) for GD7543 only, supporting true-color, full-motion video playback, multi-format frame buffer, integrated YCrCb: RGB color space converter, and 2x horizontal/vertical hardware scaling
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32-bit Direct-Connect CPU Host Bus Interfaces:
- '486 CPU local bus (up to 50 MHz @ 5V)
- VESA VL-Bus
- PCI system bus with burst support, including big-endian byte-order hardware support for PowerPC
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Scalable 1- and 2-Mbyte Display Memory:
- Two or four 256K × 16 DRAMs, or four 512K × 8 DRAMs
- Extended-Data-Out/Hyper-Page-Mode DRAM support
-
Integrated Programmable Frequency Synthesizer:
- Core VCLK up to 80 MHz @ 5V; 77 MHz @ 3.3V
- Core MCLK up to 60 MHz @ 5V; 50 MHz @ 3.3V
- Vertical refresh rates up to 75 Hz (depending on graphics mode, MCLK, and voltage level of core VCC)
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GUI-Accelerated SVGA LCD Controller for Portable Computers:
- 64x64 pixel size hardware pop-up icons, displaying up to four independently controlled, 4-color icons
- Integrated 24-bit true-color RAMDAC supporting various resolutions and color depths
- Support for 640x480 and 800x600 LCDs, including dual-scan color and monochrome STN LCDs, color TFT LCDs, dithering algorithm, enhanced frame-rate modulation algorithm, and SimulSCAN (simultaneous CRT and LCD)
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Power-Management Capabilities:
- 3.3-V, 5.0-V, and mixed-voltage operation
- Hardware-suspend input pin or software-suspend option
- Self-refresh DRAMs or DRAM refresh via 32-kHz clock
- Internal timers for Standby mode and backlight control
- LCD power sequencing
- VESA DPMS (Display Power Management Signaling) and DDC-1 (Display Data Channel) support
The GD7541 and GD7543 LCD controllers are suitable for a wide range of portable computer designs, offering enhanced performance, multimedia support, and power management features.
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