pocket386:lcd_controller
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| pocket386:lcd_controller [2024/05/17 12:23] – agiri | pocket386:lcd_controller [2024/05/19 22:38] (current) – natalie | ||
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| ==== Signals ==== | ==== Signals ==== | ||
| - | * **Red wire:** Active-low enable line for the LCD. Bringing this high will disconnect the H/Vsync and RGB lines from the LCD controller, through U7 (TS5V330 analog switch) and U8/U9 (74LVC1G125 buffers). Pulled up to the 3v3 reg's Vin through R5 (4k7) | + | * **Red wire:** Active-low enable line for the LCD, used in external VGA mode. Bringing this high will disconnect the H/Vsync and RGB lines from the LCD controller, through U7 (TS5V330 analog switch) and U8/U9 (74LVC1G125 buffers). Pulled up to the 3v3 reg's Vin through R5 (4k7) |
| * **Black wire:** TTL serial data from the keyboard controller. This is uni-directional to the LCD controller. As far as I know, the KBC is driving it at 5V levels. Tends to float around 4V when driven high. Pulled up to 3.3v through R20 (4k7) | * **Black wire:** TTL serial data from the keyboard controller. This is uni-directional to the LCD controller. As far as I know, the KBC is driving it at 5V levels. Tends to float around 4V when driven high. Pulled up to 3.3v through R20 (4k7) | ||
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| ===== Acknowledgements ===== | ===== Acknowledgements ===== | ||
| - | Thanks | + | Thanks |
pocket386/lcd_controller.1715948614.txt.gz · Last modified: 2024/05/17 12:23 by agiri