GMS30C7201 Datasheet, PDF (150/352 Pages) Hynix Semiconductor – 60MHz operation frequency Low power consumption

LCD & VGA Controllers
11.14 Grayscaler Test Registers
The registers GSFrame State, GSRow State and GS Column State are used for the purpose of
production test and must not be written to or read from in normal use.
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GMS30C7201 Data Sheet