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AMD Geode™ SC3200 Processor Data Book

Video Processor Module - Video Processor Registers - Function 4

Revision 5.1

Offset 08h-0Bh

Video X Position Register (R/W)

Reset Value: 00000000h

Provides the window X position. This register is programmed relative to CRT horizontal sync input (not physical screen position).

Note:

H_TOTAL and H_SYNC_END are values programmed in the GX1 module’s Display Controller Timing registers

(GX_BASE+Memory Offset 8330h[26:19] and 8338h[10:3], respectively). The value of (H_TOTAL – H_SYNC_END) is some-

times referred to as “horizontal back porch”. For more information, see the AMD Geode™ GX1 Processor Data Book.

31:28

Reserved.

27:16

VID_X_END (Video X End Position). Represents the horizontal end position of the video window (not inclusive). This value

is calculated according to the following formula:

Value = Desired screen position + (H_TOTAL – H_SYNC_END) – 13.

15:12

Reserved.

11:0

VID_X_START (Video X Start Position). Represents the horizontal start position of the video window. This value is calcu-

lated according to the following formula:

Value = Desired screen position + (H_TOTAL – H_SYNC_END) – 14.

Offset 0Ch-0Fh

Video Y Position Register (R/W)

Reset Value: 00000000h

Provides the window Y position. This register is programmed relative to CRT vertical sync input (not physical screen position).

Note:

V_TOTAL and V_SYNC_END are values programmed in the GX1 module’s Display Controller Timing registers

(GX_BASE+Memory Offset 8340h[26:16] and 8348h[26:16], respectively). The value of (V_TOTAL – V_SYNC_END) is some-

times referred to as “vertical back porch”. For more information, see the AMD Geode™ GX1 Processor Data Book.

31:27

Reserved.

26:16

VID_Y_END (Video Y End Position). Represents the vertical end position of the video window (not inclusive). This value is

calculated according to the following formula:

Value = Desired screen position + (V_TOTAL – V_SYNC_END) + 2.

15:11

Reserved

10:0

VID_Y_START (Video Y Start Position). Represents the vertical start position of the video window. This value is calculated

according to the following formula:

Value = Desired screen position + (V_TOTAL – V_SYNC_END) + 1.

Offset 10h-13h

Video Upscale Register (R/W)

Reset Value: 00000000h

Provides horizontal and vertical upscale factors of the window.

31:30

Reserved.

29:16

VID_Y_SCL (Video Y Scale Factor). Represents the vertical upscale factor of the video window according to the following

formula:

VID_Y_SCL = 8192 * (Ys - 1) / (Yd - 1)

where:

Ys = Video source vertical size in pixels

Yd = Video destination vertical size in pixels

Note:

Upscale factor must be used. Yd is equal or bigger than Ys. If no scaling is intended, set to 2000h. The actual scale

factor used is VID_Y_SCL/8192, but the formula above fits a given source number of lines into a destination win-

dow size.

Note:

When progressive mixing/blending is programmed (F4BAR0+Memory Offset 4Ch[9] = 0) and the video data is

interlaced, this register should be programmed to 1000h to double the vertical lines,

15:14

Reserved.

13:0

VID_X_SCL (Video X Scale Factor). Represents horizontal upscale factor of the video window according to the following

formula:

VID_X_SCL = 8192 * (Xs - 1) / (Xd - 1)

where:

Xs = Video source horizontal size in pixels

Xd = Video destination vertical size in pixels

Note:

Upscale factor must be used. Xd is equal or bigger than Xs. If no scaling is intended, set to 2000h. The actual scale

factor used is VID_X_SCL/8192, but the formula above fits a given source number of pixels into a destination win-

dow size.

Table 7-7. F4BAR0+Memory Offset: Video Processor Configuration Registers (Continued)

Bit

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