FEATURES
Ο
Full IBM® VGA compatibility in a 128-pin Plastic Quad Flat Pack (PQFP) package
Built-in VIDEO DAC. The video outputs connect direcily to an IBM® PS/2TM or compatible analog
display. No external color look-up table or display interface support is required.
Built-in CLOCK SYNTHESIZER, generating all timing from the 14 MHz clock supplied by the System
Bus interface. No additional external oscillators are required.
Selectable internally generated memory timing clock of 37.5 MHz for 80ns DRAM or 44.7 MHz for highperformance 70ns DRAMs.
Built-in MONITOR TYPE DETECTION circuit.
Connects directly to the MICRO CHANNELTM of PC/XT/AT System Bus, and VIDEO FEATURE
CONNECTOR, and requires no additional interface support logic or buffers
Video circuit complete with the addition of passive components and two 256K x 4 DRAMs
Supports 16-bit Video Memory read/write cycles in all video modes
Watless Write cycles to Video Memory maximize access by the System Processor, by combining a
MEMORY WRITE DATA FIFO and ZERO WAIT STATE (AT Bus) request capability.
Dual-ported memory access control, rapidly prefetching video memory data into a DISPLAY DATA FIFO
while allowing the System Processor optimum access time to the display buffer
Supports 16-bit I/O read/write cycles to I/O ports, for enhanced performance.
Supports 8- or 16-bit BIOS ROM implementations
ZERO WAIT STATE (AT Bus) request capability for BIOS ROM Memory access cycles.
132-column Alphanumeric Mode, using an internally generated 41 MHz dot clock
800 x 600 x 16 color Graphics Mode, using an internally generated 36 MHz dot clock