AMD SC1200, SC1201 manual Bit Description Offset 50h-53h, Offset 54h-57h, 346

32579B Video Processor Module - Video Processor Registers - Function 4

Table 7-9. F4BAR0+Memory Offset: Video Processor Configuration Registers (Continued)

Bit

Description

Offset 50h-53h		Cursor Color Key Register (R/W)	Reset Value: 00000000h
31:29	Reserved.
28:24	COLOR_REG_OFFSET (Cursor Color Register Offset). This field indicates a bit in the incoming graphics stream. It is
	used to indicate which of the two possible cursor color registers should be used for color key matches for the bits in the
	graphics stream.
23:0	CUR_COLOR_KEY (Cursor Color Key). Specifies the 24-bit RGB value of the cursor color key. The incoming graphics
	stream is compared with this value. If a match is detected, the pixel is replaced by a 24-bit value from one of the Cursor
	Color registers.
Offset 54h-57h		Cursor Color Mask Register (R/W)	Reset Value: 00000000h
31:24	Reserved.
23:0	CUR_COLOR_MASK (Cursor Color Mask). This mask is a 24-bit value. Zeroes in the mask cause the corresponding bits

in the incoming graphics stream to be ignored.

Offset 58h-5Bh		Cursor Color Register 1 (R/W)	Reset Value: 00000000h
31:24	Reserved.
23:0	CUR_COLOR_REG1 (Cursor Color Register 1). Specifies a 24-bit cursor color value. This is an RGB value (for RGB
	blending) or a YUV value (for YUV blending). In interlaced YUV blending mode, Y/2 value should be used.

This is one of two possible cursor color values. The COLOR_REG_OFFSET bits (F4BAR0+Memory Offset 50h[28:24]) determine a bit of the graphics data that if even, selects this color to be used.

Offset 5Ch-5Fh		Cursor Color Register 2 (R/W)	Reset Value: 00000000h
31:24	Reserved.
23:0	CUR_COLOR_REG2 (Cursor Color Register 2). Specifies a 24-bit cursor color value. This is an RGB value (for RGB
	blending) or a YUV value (for YUV blending). In interlaced YUV blending mode, Y/2 value should be used.

This is one of two possible cursor color values. The COLOR_REG_OFFSET bits (F4BAR0+Memory Offset 50h[28:24]) determine a bit of the graphics data that if even, selects this color to be used.

Offset 60h-63h Alpha Window 1 X Position Register (R/W) Reset Value: 00000000h

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.

Desired screen position should not be outside a video window (F4BAR0+Memory Offset 08h and 0Ch).

31:27	Reserved.
26:16	ALPHA1_X_END (Alpha Window 1 Horizontal End). Determines the horizontal end position of Alpha Window 1 (not inclu-
	sive). This value is calculated according to the following formula:
	Value = Desired screen position + (H_TOTAL – H_SYNC_END) – 1.
15:11	Reserved.
10:0	ALPHA1_X_START (Alpha Window 1 Horizontal Start). Determines the horizontal start position of Alpha Window 1. This
	value is calculated according to the following formula:
	Value = Desired screen position + (H_TOTAL – H_SYNC_END) – 2.
Offset 64h-67h		Alpha Window 1 Y Position Register (R/W)	Reset Value: 00000000h

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.

Desired screen position should not be outside a video window (F4BAR0+Memory Offset 08h and 0Ch).

31:27	Reserved.
26:16	ALPHA1_Y_END (Alpha Window 1 Vertical End). Determines the vertical end position of Alpha Window 1 (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	ALPHA1_Y_START (Alpha Window 1 Vertical Start). Determines the vertical start position of Alpha Window 1. This value
	is calculated according to the following formula:
	Value = Desired screen position + (V_TOTAL – V_SYNC_END) + 1.
346	AMD Geode™ SC1200/SC1201 Processor Data Book