CL-GD542X
VGA Graphics Controllers
CL-GD5425 Highlights
True Color VGA Controller with TV Output
FEATURES
OVERVIEW
■ True color VGA controller with TV output
The CL-GD5425 integrates a Super VGA controller, dual-
frequency synthesizer, true-color palette DAC, and TV
processing support into a single device.
— Scaling fits full VGA display into TV viewing area while
maintaining proper aspect ratio
— Flicker-filter reduces interlaced artifacts associated with
computer-generated graphic images
A member of the industry-standard CL-GD542X family of
true colorVGA controllers, the CL-GD5425 is fully backed
by software and design support.
■ Glueless interface to popular TV encoders
■ Multimedia support
The CL-GD5425 provides NTSC/PAL timing for standard
VGA display modes, as well as the following extended
resolutions:
— Video overlay of 16-bit RGB, 16-bit YCrCb
— 8-bit feature connector
— 16-bit VAFC (VESA advanced feature connector)
— GENLOCK support
Extended Resolutions for TV Output
■ Graphics acceleration features:
— Color expansion reduces host bus traffic
— 64 × 64 hardware cursor
Resolution
No. of Colors
Memory
640 × 480
640 × 480
640 × 400
256
64K
64K
512 Kbyte
1 Mbyte
— Display memory linear addressing
■ Flexible 16-bit host interface
— VESA VL-Bus (up to 50 MHz)
— ISA bus
512 Kbyte
■ Flexible 32-bit display memory interface
— Supports 256K ×4, ×8, ×16 DRAMs
The CL-GD5425 provides integrated scaling, flicker
reduction, and a glueless encoder interface that delivers
high-qualityTV display at the lowest possible cost without
the need for additional frame or line stores.
— 512-Kbyte or 1-Mbyte memory capacity
■ Integrated 24-bit DAC
The programmable flicker-reduction function reduces
interlaced artifacts inherent in computer-generated
images displayed on interlaced TV monitors. The degree
of filtering is selectable by the end-user.
— VGA resolution up to 1024 × 768, 256 colors
— NTSC resolution up to 640 × 480, 64K colors, scaled
with flicker filter
— PAL resolution up to 640 × 480, 64K colors with flicker
filter
The CL-GD5425 is 100% hardware- and BIOS-compati-
ble with VGA standards, and connects directly to the
VESA VL-Bus or ISA bus. A single DRAM, two fre-
quency references, and an economical analog encoder
are added to make a complete set-top graphics system.
May 1995
3-3
PRELIMINARY DATA BOOK v7.0
OVERVIEW
CIRRUS [ CIRRUS LOGIC ]
