RIVA128 datasheet(52/77 Pages) STMICROELECTRONICS

52 / 77 page

128-BIT 3D MULTIMEDIA ACCELERATOR

RIVA 128

52/77

mode pixel format, the least significant bits of each color are located separately in the top byte of the pixel.

This also permits an 8:8:8 mode without gamma with <1% error if desired.

NOTE

This 32-bit representation can be extended to 64-bit and 128-bit widths by duplicating the 32-bit word in little-endian format.

Limitations on line lengths

Table 15.

Permitted line length multiples

11.3 HARDWARE CURSOR

The RIVA 128 supports a 32x32 15bpp full color

hardware cursor as defined by Microsoft Win-

dows.

• Full color 5:5:5 format

• Pixel complement

• Transparency

• Pixel inversion

The cursor pattern is stored in a 2KByte bitmap lo-

cated in off-screen framestore. Details of program-

ming the hardware cursor are given in the RIVA

128

Programming Reference Manual [2]. Regis-

ters control cursor enabling/disabling, location of

cursor bitmap and cursor display coordinates. The

cursor data and it's position should only be

changed during frame flyback. The cursor should

be disabled when not being used.

Cursor format

The 5-bit RGB color components are expanded to

10 bits per color before combining with the graph-

ics display data. The expanded 10-bit color is com-

posed of the 5-bit cursor color replicated in the up-

per and lower 5-bit fields. The cursor pixels are

combined such that the cursor will overlay a video

window if present.

Cursor pixel bit 15 (A) is the replace mode bit.

When A=1, the cursor pixel replaces the normal

display pixel. If A=0, the expanded 30 bits of the

cursor color are XORed with the display pixel to

provide the complement of the background color.

Cursor pixels can be made transparent (normal

display pixel is unmodified) by setting to a value of

0x0000. To invert the bits of the normal display

pixel, the cursor pixel should be set to 0x7FFF.

Use of pixel input pins (FBD[31:0])

Pixel 0

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9

Red gamma

Green gamma

Blue gamma

1X R1 R0 G1 G0 B1 B0 R9 R8 R7 R6 R5 R4 R3 R2 G9 G8 G7 G6 G5 G4 G3 G2 B9 B8 B7 B6 B5 B4 B3 B2

bpp

Number of pixels that the line

length must be a multiple of

15 14 13 12 11 10 98

321

Red

Green

Blue

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