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參數(shù)資料
| 型號(hào)： | 30046-23 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Low Power Integrated x86-Compatible 32-Bit Geode GXLV Processor(低功耗集成兼容X86的32位 Geode GXLV技術(shù)處理器) |
| 中文描述： | 32-BIT, 200 MHz, MICROPROCESSOR, CPGA320 |
| 封裝： | SPGA-320 |
| 文件頁(yè)數(shù)： | 141/247頁(yè) |
| 文件大?。?/td> | 4379K |
| 代理商： | 30046-23 |
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Revision 1.2
141
www.national.com
Integrated Functions (
Continued
)
G
4.5.7.3
The graphics pipeline contains full hardware support for
the VGA front end. The VGA data is stored in a 256 KB
buffer located in graphics memory. The main task for Vir-
tual VGA (see Section 4.6
“
Virtual VGA Subsystem
”
on
page 157) is converting the data in the VGA buffer to an 8-
bpp frame buffer that can be displayed by the display con-
troller.
VGA Display Support
For some modes, the display controller can display the
VGA data directly and the data conversion is not neces-
sary. This includes standard VGA mode 13h and the vari-
ations of that mode used in several games; the display
controller can also directly display VGA planar graphics
modes D, E, F, 10, 11, and 12. Likewise, the hardware can
directly display all of the higher-resolution VESA modes.
Since the frame buffer data is written directly to memory
instead of travelling across an external bus, the GXLV pro-
cessor often outperforms VGA cards for these modes.
The display controller, however, does not directly support
text modes. SoftVGA must convert the characters and
attributes in the VGA buffer to an 8-bpp frame buffer
image the hardware uses for display refresh.
4.5.8
The Display Controller maps 100h memory locations
starting at GX_BASE+8300h for the display controller reg-
isters. Refer to Section 4.1.2
“
Control Registers
”
on page
99 for instructions on accessing these registers.
Display Controller Registers
The Display Controller Registers are divided into six cate-
gories:
Configuration and Status Registers
Memory Organization Registers
Timing Registers
Cursor and Line Compare Registers
Color Registers
Palette and RAM Diagnostic Registers
Table 4-28 summarizes these registers and locations, and
the following subsections give detailed register/bit for-
mats.
Table 4-28. Display Controller Register Summary
GX_BASE+
Memory Offset
Type
Name/Function
Default
Value
Configuration and Status Registers
8300h-8303h
R/W
DC_UNLOCK
Display Controller Unlock: This register is provided to lock the most critical memory-
mapped display controller registers to prevent unwanted modification (write operations).
Read operations are always allowed.
DC_GENERAL_CFG
Display Controller General Configuration: General control bits for the display controller.
DC_TIMING_CFG
Display Controller Timing Configuration: Status and control bits for various display
timing functions.
DC_OUTPUT_CFG
Display Controller Output Configuration: Status and control bits for pixel output
formatting functions.
00000000h
8304h-8307h
R/W
00000000h
8308h-830Bh
R/W
xx000000h
830Ch-830Fh
R/W
xx000000h
Memory Organization Registers
8310h-8313h
R/W
DC_FB_ST_OFFSET
Display Controller Frame Buffer Start Address: Specifies offset at which the frame buffer
starts.
DC_CB_ST_OFFSET
Display Controller Compression Buffer Start Address: Specifies offset at which the com-
pressed display buffer starts.
DC_CUR_ST_OFFSET
Display Controller Cursor Buffer Start Address: Specifies offset at which the cursor mem-
ory buffer starts.
Reserved
DC_VID_ST_OFFSET
Display Controller Video Start Address: Specifies offset at which the video buffer starts.
DC_LINE_DELTA
Display Controller Line Delta: Stores line delta for the graphics display buffers.
xxxxxxxxh
8314h-8317h
R/W
xxxxxxxxh
8318h-831Bh
R/W
xxxxxxxxh
831Ch-831Fh
8320h-8323h
--
00000000h
xxxxxxxxh
R/W
8324h-8327h
R/W
xxxxxxxxh
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 300471U | Radial, -55dotc, long life wsitching-power |
| 300CNQ | SCHOTTKY RECTIFIER |
| 300CNQ035 | SCHOTTKY RECTIFIER |
| 300CNQ040 | SCHOTTKY RECTIFIER |
| 300CNQ045 | SCHOTTKY RECTIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 30046-46L | 制造商:LENOX 功能描述:HOLE SAW BI-METAL 73MM |
| 300-466A | 制造商:LG Corporation 功能描述:CABINET ASSYCMT-9325 |
| 300-466B | 制造商:LG Corporation 功能描述:CABINET ASSYCMT-9324 |
| 300-466K | 制造商:LG Corporation 功能描述:CABINET ASSYCMT-9322 |
| 300-466R | 制造商:LG Corporation 功能描述:FRONT CABINET |
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