Pin Descriptions - Acer 390 Series Service Manual

The figure below shows the display memory configurations using and external STN-DD buffer:
2.4.4

Pin Descriptions

2.4.4.1 Introduction
The following pages contain the BGA ball assignments and a list of all the pins for the 65555 GUI
Accelerator. The pins are divided into the following groups:
PCI Bus
Major Chips Description
The 64-bit wide memory configurations have double the memory
bandwidth of the 32-bit wide configurations.
Some of the 32-bit configurations allow an additional 256K x 16
device to be used for an external 16-bit wide STN-DD buffer, as
shown above.
The 65555 supports both video capture/playback and external
STN-DD buffer at the same time
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