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11-26
Display Interface
RAMDAC
A brief description is given below of the register accessed during
initialization. For a full description, please refer to the manufacturer’s data
sheet, see Appendix A, “Further Information”.
Miscellaneous Control
1 – Index 0x0070
This register must contain the value 0x11. This configures the RAMDAC
to disable the SENSE pin and for a 64-bit pixel bus.
Miscellaneous Control
2 – Index 0x0071
This register mus contain 0x45. This configures the RAMDAC to use the
internal PLL clock source, to use 8-bit color resolution (as apposed to 6-bit
for VGA compatibility), and to use the VRAM pixel port inputs.
Miscellaneous Control
3 – Index 0x0072
This register must contain 0x00 when using 8 or 16 BPP but must contain
0x80 when using 24 or 32 BPP. This causes the RAMDAC to swap the red
and blue pixels to correct for endian differences between the frame buffer
and RAMDAC.
Miscellaneous Clock
Control – Index 0x0002
Bits 3:1
Control the clock divider which means that the setting of
this register depends on the pixel depth in use. Valid settings
are:
001 Pixel Out/2 = 32 BPP
010 Pixel Out/4 = 16 BPP
011 Pixel Out/8 = 8 BPP
Bit 0
Used to enable the internal PLL. Always = 1.
0088
MISR Blue
0089 - 008d
Reserved
008E
Pixel PLL VCO Divider Input
008F
Pixel PLL Reference Divider Input
0090
VRAM Mask 0
0091
VRAM Mask 1
0092
VRAM Mask 2
0093
VRAM Mask 3
0094-00ff
Reserved
0100 - 04FF
Cursor Array
0500 - 07FF
Reserved
Order
Accessed
Register
Contents
Index
Name
8 BPP
16 BPP
24 BPP
32 BPP
Table 11-12 RAMDAC Indexed Registers (Continued)
S3GX_TRMBook Page 26 Friday, September 19, 1997 11:39 am
Содержание SPARCbook 3 series
Страница 1: ...Series Technical Reference Manual 980327 02 3 S3GX_TRMBook Page i Friday September 19 1997 11 39 am...
Страница 8: ...viii S3GX_TRMBook Page viii Friday September 19 1997 11 39 am...
Страница 28: ...1 16 Architecture Overview Microcontroller Subsystem S3GX_TRMBook Page 16 Friday September 19 1997 11 39 am...
Страница 44: ...2 16 The SPARC CPU SBus Controller S3GX_TRMBook Page 16 Friday September 19 1997 11 39 am...
Страница 76: ...5 8 SCSI Controller DMA Support S3GX_TRMBook Page 8 Friday September 19 1997 11 39 am...
Страница 82: ...6 6 Ethernet Interface DMA Support for Network Operations S3GX_TRMBook Page 6 Friday September 19 1997 11 39 am...
Страница 96: ...7 14 PCMCIA Interface Microcontroller Registers S3GX_TRMBook Page 14 Friday September 19 1997 11 39 am...
Страница 146: ...9 28 MODEM Class 2 Fax Command Set S3GX_TRMBook Page 28 Friday September 19 1997 11 39 am...
Страница 180: ...11 30 Display Interface RAMDAC S3GX_TRMBook Page 30 Friday September 19 1997 11 39 am...
Страница 210: ...B 10 Connector Information Removable Hard Drive SCSI Connector S3GX_TRMBook Page 10 Friday September 19 1997 11 39 am...
Страница 216: ...Index vi S3GX_TRMBook Page vi Friday September 19 1997 11 39 am...