The STG 1703 is a fully integrated dual clock synthesizer and 16-bit pixel port true color Palette-DAC designed for PC graphics subsystems. It features two phase-locked loop (PLL) synthesizers that provide independently controlled video and memory clock outputs, requiring only a single external crystal for the on-chip PLL reference.
The device supports various pixel modes including serializing 16-bit ports up to 135MHz and standard 8-bit ports up to 110MHz. It includes programmable power-down features, an on-chip checksum test, and is designed in a 68-pin PLCC package compatible with the STG1700/1702 series.
| Package Type | 68-pin PLCC |
|---|---|
| Pixel Port Sampling Rate (Serializing) | up to 135MHz |
| Pixel Port Sampling Rate (Standard) | up to 110MHz |
| Video Clock Frequencies | 2 VGA base or 14 VESA standards |
It requires a single external crystal connected between the Xout and Xin pins.
Five successive reads of RS location 2h return the mask register contents four times followed by the Pixel Command Register value.