• Cirrus Logic GD7541 (Nordic Light)

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

• 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

• 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

• 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

• 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)

• 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)

• 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.