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參數(shù)資料
| 型號： | ADV476KP66 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 顯示控制器 |
| 英文描述： | CMOS Monolithic 256x18 Color Palette RAM-DAC |
| 中文描述： | PALETTE-DAC DSPL CTLR, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 175K |
| 代理商： | ADV476KP66 |
ADV476
REV. B
–7–
Frame Buffer Interface
T he P0-P7 inputs are used to address the color palette RAM, as
shown in T able IV. T hese inputs are latched on the rising edge
of PCLK and address any of the 256 locations in the color pal-
ette RAM. T he addressed location contains 18 bits of color (6
bits of red, 6 bits of green and 6 bits of blue) information. T his
data is transferred to the three DACs and is then converted to
an analog output (RED, GREEN, BLUE), these outputs then
control the red, green and blue electron guns in the monitor.
T he
BLANK
input is also latched on the rising edge of PCLK .
T his is to maintain synchronization with the color data.
T able IV. Pixel Select/Color Palette Control T ruth T able
P0–P7
Addressed by Frame Buffer
00H
01H
FFH
Color Palette RAM Location 00H
Color Palette RAM Location 01H
Color Palette RAM Location FFH
Pixel Read Mask Register
T he Pixel Read Mask Register in the ADV476 can be used to
implement register level pixel processing, thereby cutting down
on software overhead. T his is achieved by gating the input pixel
stream (P0–P7) with the contents of the pixel read mask regis-
ter. T he operation is a bitwise logical ANDing of the pixel data.
T he contents of T his register can be accessed and altered at any
time by the MPU (D0–D7). T able I shows the relevant control
signals.
T his pixel masking operation can be used to alter the displayed
colors without changing the contents of either the video frame
buffer or the color palette RAM. T he effect of this operation is
to partition the color palette into a user determined number of
color planes. T his process can be used for special effects includ-
ing animation, overlays and flashing objects.
(See also application note entitled “Animation Using the Pixel
Read Mask Register of the ADV47x Series of Video RAM-
DACs,” available from Analog Devices (Pub No.
E1316–15–10/89).
Figure 3. Block Diagram Showing Pixel Read
Mask Register
Analog Interface
T he ADV476 has three analog outputs, corresponding to the
Red, Green and Blue video signals.
T he Red, Green and Blue analog outputs of the ADV476 are
high impedance current sources. Each one of these three RGB
current outputs is capable of directly driving a 37.5
load, such
as a doubly-terminated 75
coaxial cable. Figure 4a shows the
required configuration for each of the three RGB outputs con-
nected into a doubly-terminated 75
load. T his arrangement
will develop RS-343A video output voltage levels across a 75
monitor. A simple method of driving RS-170 video levels into a
75
monitor is shown in Figure 4b. T he output current levels
of the DACs remain unchanged but the source termination
Figure 4a. Recommended Analog Output Termination
for RS-343A
resistance, Z
S
on each of the three DACs is increased from 75
to 150
.
More detailed information regarding load terminations for vari-
ous output configurations, including RS-343A and RS-170, is
available in an application note entitled “Video Formats &
Required Load T erminations,” available from Analog Devices.
Figure 5 shows the video waveforms associated with the three
RGB outputs, driving the doubly terminated 75
load of Fig-
ure 4a. T he
BLANK
control input drives the analog outputs to
the Black Level.
BLANK
is asserted prior to horizontal and ver-
tical screen retrace. T able V details how the
BLANK
input
modifies the output levels.
Figure 4b. Recommended Analog Output Termination
for RS-170
相關PDF資料 |
PDF描述 |
|---|---|
| ADV476KN66 | CMOS Monolithic 256x18 Color Palette RAM-DAC |
| ADV476KN35 | Circular Connector; No. of Contacts:11; Series:LJTP02R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:19; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:19-11 |
| ADV476KN50 | Circular Connector; No. of Contacts:66; Series:LJTP02R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:19; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:19-35 |
| ADV478 | CMOS 80 MHz Monolithic 256 x 24(18) Color Palette RAM-DACs |
| ADV471KP35 | Circular Connector; No. of Contacts:37; Series:LJTP02R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:15-35 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADV476KP66E | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADV476KP66-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| ADV476KP80E | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADV476KP80E-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| ADV477KP35 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC) |
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