CS5530A datasheet(206/259 Pages) NSC

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Offset 08h-0Bh

Video X Register (R/W)

Reset Value = xxxxxxxxh

31:27

Reserved: Set to 0.

26:16

VideoXEndPosition: This field represents the horizontal end position of the video window according to the following

formula. Position programmed = screen position + (H_TOTAL – H_SYNC_END) – 13.

15:11

Reserved: Set to 0.

10:0

Video X Start Position: This field represents the horizontal start position of the video window according to the following

formula. Position programmed = screen position + (H_TOTAL – H_SYNC_END) – 13.

Offset 0Ch-0Fh

Video Y Register (R/W)

Reset Value = xxxxxxxxh

31:27

Reserved: Set to 0.

26:16

VideoY EndPosition: This field represents the vertical end position of the video window according to the following formula.

Position programmed = screen position + (V_TOTAL – V_SYNC_END) + 1.

15:11

Reserved: Set to 0.

10:0

Video Y Start Position: This field represents the vertical start position of the video window according to the following

formula. Position programmed = screen position + (V_TOTAL – V_SYNC_END) + 1.

Offset 10h-13h

Video Scale Register (R/W)

Reset Value = xxxxxxxxh

31:30

Reserved: Set to 0.

29:16

Video Y Scale Factor: This field represents the video window vertical scale factor according to the following

formula.

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

Where:

Ys = Video source vertical size in lines

Yd = Video destination vertical size in lines

15:14

Reserved: Set to 0.

13:0

Video X Scale Factor: This field represents the video window horizontal scale factor according to the following

formula.

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

Where:

Xs = Video source horizontal size in pixels

Xd = Video destination horizontal size in pixels

Offset 14h-17h

Video Color Key Register (R/W)

Reset Value = xxxxxxxxh

31:24

Reserved: Set to 0.

23:0

Video Color Key: This field represents the video color key. It is a 24-bit RGB value. The graphics or video data being

compared may be masked prior to the compare by programming the Video Color Mask Register (F4BAR+Memory Offset

18h) appropriately.

Offset 18h-1Bh

Video Color Mask Register (R/W)

Reset Value = xxxxxxxxh

31:24

Reserved: Set to 0.

23:0

Video Color Mask: This field represents the video color mask. It is a 24-bit RGB value. Zeroes in the mask cause the

corresponding bits in the graphics or video stream being compared to be ignored.

Offset 1Ch-1Fh

Palette Address Register (R/W)

Reset Value = xxxxxxxxh

31:8

Reserved: Set to 0.

7:0

Palette Address: The value programmed is used to initialize the palette address counter.

Offset 20h-23h

Palette Data Register (R/W)

Reset Value = xxxxxxxxh

31:24

Reserved: Set to 0.

23:0

Palette Data: This register contains the read or write data for a Gamma RAM access.

Table 4-23. F4BAR+Memory Offset xxh: Video Controller Configuration Registers (Continued)

Bit

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