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PDF ( 数据手册 , 数据表 ) ADV473

零件编号 ADV473
描述 CMOS 135 MHz True-Color Graphics Triple 8-Bit Video RAM-DAC
制造商 Analog Devices
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ADV473 数据手册, 描述, 功能
a
CMOS 135 MHz True-Color Graphics
Triple 8-Bit Video RAM-DAC
ADV473
FEATURES
ADV478/ADV471 (ADV®) Register Level Compatible
IBM PS/2,* VGA*/XGA* Compatible
135 MHz Pipelined Operation
Triple 8-Bit D/A Converters
Triple 256 ؋ 8 (256 ؋ 24) Color Palette RAM
Three 15 ؋ 8 Overlay Registers
On-Board Voltage Reference
RS-343A/RS-170 Compatible Analog Outputs
TTL Compatible Digital Inputs and Outputs
Sync on All Three Channels
Programmable Pedestal (0 or 7.5 IRE)
Standard MPU l/O Interface
+5 V CMOS Monolithic Construction
68-Pin PLCC Package
APPLICATIONS
High Resolution Color Graphics
True-Color Visualization
CAE/CAD/CAM
Image Processing
Desktop Publishing
MODES
24-Bit True Color
8-Bit Pseudo Color
15-Bit True Color
8-Bit True Color
SPEED GRADES
135 MHz, 110 MHz
80 MHz, 66 MHz
GENERAL DESCRIPTION
The ADV473 is a complete analog output, Video RAM-DAC
on a single CMOS monolithic chip. The part is specifically
designed for true-color computer graphics systems.
The ADV473 integrates a number of graphic functions onto one
device allowing 24-bit direct true-color operation at the maxi-
mum screen update rate of 135 MHz. It can also be used in
other modes, including 15-bit true color and 8-bit pseudo or in-
dexed color. The ADV473 is fully PS/2 and VGA register level
compatible. It is also capable of implementing IBM’s XGA
standard.
(Continued on page 4)
FUNCTIONAL BLOCK DIAGRAM
VREFIN
VREFOUT
SYNC
BLANK
S0
S1
OL0
OVERLAYS
OL3
R0
RED
R7
G0
GREEN
G7
B0
BLUE
B7
P
I
4X
E
L
P
8 O8
R
T
88
88
SWITCHING
MATRIX &
PIXEL
MASK
8
8
8
OVERLAY PALETTE
15 x 8 RAM
15 x 8 RAM
15 x 8 RAM
8 88
RED
256 x 8
RAM
COLOR
PALETTE
GREEN
256 x 8
RAM
BLUE
256 x 8
RAM
8
8
8
8
8
8
COLOR
PALETTE/
OVERLAY
PALETTE
SWITCHER
8
8
8
D
A
C
P
O
R
T
VOLTAGE
REFERENCE
GENERATOR
VOLTAGE
REFERENCE
CONTROL
CIRCUIT
8 RED
DAC
8 GREEN
DAC
8 BLUE
DAC
OPA
IOR
IOG
IOB
CLOCK
MODE CONTROL PIXEL MASK
REGISTERS
REGISTERS
8
RED
REG
8
GREEN
REG
8
BLUE
REG
MPU PORT
8
ADDRESS
REG
MPU & PIXEL
PORT
CONTROL LOGIC
ADV473
CR0
CR1
CR2
CR3
D0–D7
RD WR RS0 RS1 RS2
ADV is a registered trademark of Analog Devices Inc.
*Personal System/2 and VGA are trademarks of International Business Machines Corp.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703







ADV473 pdf, 数据表
ADV473
Command Register (CR)
The ADV473 has an internal command register (CR). This reg-
ister is 8 bits wide, CR0–CR7 and is directly mapped to the
MPU data bus on the part, D0–D7. The command register can
be written to or read from. It is not initialized, therefore it must
be set. Figure 4 shows what each bit of the CR register controls
and shows the values it must be programmed to for various
modes of operation.
Color Modes
The ADV473 supports four color modes, 24-bit true-color,
15-bit true-color, 8-bit true-color and 8-bit pseudo-color. The
mode of operation is determined by the S0 and S1 inputs, in
conjunction with CR7 and CR6 of the command register. S0
and S1 are pipelined to maintain synchronization with the video
data. Table III illustrates the modes of operation.
Table III. Color Operation Modes
OL3–OL0 S1, S0 CR7, CR6 Mode
R7–R0
G7–G0
B7–B0
1111
.
.
0001
XX
.
.
XX
0000
0000
0000
0000
00
00
00
00
0000
0000
0000
0000
01
01
01
01
0000
0000
0000
0000
10
10
10
10
0000
0000
0000
0000
11
11
11
11
X = Don’t Care
XX
.
.
XX
00
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
Overlay Color 15
.
.
Overlay Color 1
24-Bit True-Color
24-Bit True-Color
24-Bit True-Color
Reserved
24-Bit True-Color Bypass
24-Bit True-Color Bypass
24-Bit True-Color Bypass
Reserved
8-Bit Pseudo-Color (Red)
8-Bit Pseudo-Color (Green)
8-Bit Pseudo-Color (Blue)
15-Bit True-Color
8-Bit True-Color Bypass (Red)
8-Bit True-Color Bypass (Green)
8-Bit True-Color Bypass (Blue)
15-Bit True-Color Bypass
XXH
.
.
XXH
R7–R0
R7–R0
R7–R0
Reserved
R7–R0
R7–R0
R7–R0
Reserved
P7–P0
Ignored
Ignored
Orrrrrgg
rrrgggbb
Ignored
Ignored
Orrrrrgg
XXH
.
.
XXH
G7–G0
G7–G0
G7–G0
Reserved
G7–G0
G7–G0
G7–G0
Reserved
Ignored
P7–P0
Ignored
gggbbbbb
Ignored
rrrgggbb
Ignored
gggbbbbb
XXH
.
.
XXH
B7–B0
B7–B0
B7–B0
Reserved
B7–B0
B7–B0
B7–B0
Reserved
Ignored
Ignored
P7–P0
Ignored
Ignored
Ignored
rrrgggbb
Ignored
CR7 CR6
CR5 CR4
CR3 CR2 CR1 CR0
COLOR MODE
SELECT
(SEE TABLE III)
PEDESTAL ENABLE
CONTROL (SETUP)
CR5
0 0 IRE
1 7.5 IRE
CONTROL OUTPUTS
THESE BITS ARE OUTPUT
ONTO THE CR3-CR0 PINS
8-BIT/6-BIT
COLOR SELECT
CR4
0 6-BIT
1 8-BIT
Figure 4. Command Register (CR)
–8– REV. A














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