Sony UP-21MD Service Manual page 50

* Various monitor output operations
FULL image
SPLIT 2 image (Decimated in the horizontal and vertical directions.)
4IN1 image (Equal to a SPLIT 2 image as IC operation.)
Monitor output shift size
Read DRAM address
By setting the items above, the DRAM control circuit automatically performs the monitor output
operation in synchronization with VD and HD signals.
* Random access operation
Write DRAM address
Write data
The random access operation is performed by setting the items above and by triggering from CPU during
V blanking period.
* DRAM refresh operation
Number of refresh access addresses
By setting the item above, the DRAM control circuit automatically performs the DRAM refresh
operation. (RAS only refresh)
UP-21MD V1