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AMD Geode™ LX Processors Data Book 455
Video Processor Register Descriptions
33234H
25 D Display Off Control Source. Selects how DISPEN is controlled. Independent control
may be used to disable the backlight to save power even if the panel is otherwise ON.
0: DISPEN is controlled by with the power up/down sequence.
1: DISPEN is controlled independently of the power sequence.
24 P Panel Power On. Selects whether the panel is powered down or up following the
power sequence mechanism.
0: Power down.
1: Power up.
23 PUB2 Panel Power Up Phase Bit 2. Selects the amount of time from when V
CORE
is
enabled to when the panel data signals are enabled.
0: 32 ms
1: 128 ms
22 PUB1 Panel Power Up Phase Bit 1. Selects the time amount of from when the panel data
signals are enabled to PUB0.
0: 32 ms.
1: 128 ms.
21 PUB0 Panel Power Up Phase Bit 0. Selects the amount of time from PUB1 to when DIS-
PEN is enabled.
0: 32 ms.
1: 128 ms.
20 PD2 Panel Power Down Phase Bit 2. Selects the amount of time from when panel DIS-
PEN is disabled to PD1.
0: 32 ms.
1: 128 ms.
19 PD1 Panel Power Down Phase Bit 1. Selects the amount of time from PD2 to when the
panel data signals are disabled.
0: 32 ms.
1: 128 ms.
18 PD0 Panel Power Down Phase Bit 0. Selects the amount of time from when the panel
data signals are disabled to when panel V
CORE
is disabled.
0: 32 ms.
1: 128 ms.
17:16 HDEL HSYNC Delay. Delays HSYNC 0 - 3 Dot clocks.
15:14 VDEL VSYNC Delay. Delays VSYNC 0 - 3 Dot clocks.
13 SINV SHFCLK Invert. Invert SHFCLK to panel.
12:4 SP Spares. Read/write; no function.
3 PANEL_PWR_UP
(RO)
Panel Power-Up Status (Read Only). A 1 indicates the flat panel is currently power-
ing up.
2 PANEL_PWR_
DOWN (RO)
Panel Power-Down Status (Read Only). A 1 indicates the flat panel is currently pow-
ering down.
1 PANEL_OFF (RO) Panel OFF Status (Read Only). A 1 indicates the flat panel is currently fully off.
0 PANEL_ON (RO) Panel ON Status (Read Only). A 1 indicates the flat panel is currently fully on.
PM Bit Descriptions (Continued)
Bit Name Description