S1D13742 Epson, S1D13742 Datasheet - Page 102

• Manufacturer Part Number: S1D13742
• Description: Mobile Graphics Engine
• Manufacturer: Epson

Page 102
17.1.4 Opening Multiple Windows
17.1.5 Individual Memory Location Reads
S1D13742
X63A-A-001-06
Note
Note
Note
1. Repeat steps above (New Window Aperture write procedure) with new window coor-
2. Non-pixel doubled windows can overlap with the last one being written considered
Update Window using existing Window Coordinates:
1. Perform an Address Write to point to the Memory Data Port
2. Perform burst data writes to fill the window.
1. Set the Memory Data Format to 16bpp.
2. Write the physical address of the memory location to read from, to the Memory Read
3. Perform a read from the Memory Data Port Register.
4. Continuous reads from the Memory Data Port Register will cause the address in the
In this case the previous coordinates of the Window Aperture will be used. Every write
to the Memory Data Port will auto-increment the internal memory address only.
This function is for test purposes only and serves no practical use in a system.
To access the 2 msb’s for each 18-bit value, you must know the physical address as they
are stored at different locations as compared to the lower 16-bits.
dinates for each new window.
the top.
Address Registers (for a 16bit bus, the LSB of this address is ignored).
Memory Read Address Registers to increment, thereby supporting burst reads.
Revision 6.01 - EPSON CONFIDENTIAL
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Epson Research and Development
Hardware Functional Specification
Vancouver Design Center
Issue Date: 2007/09/18
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