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ADV473KP66 Fiches technique(PDF) 8 Page - Analog Devices

No de pièce ADV473KP66
Description  CMOS 135 MHz True-Color Graphics Triple 8-Bit Video RAM-DAC
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Site Internet  http://www.analog.com
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ADV473KP66 Fiches technique(HTML) 8 Page - Analog Devices

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ADV473
–8–
REV. A
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
XX
XX
Overlay Color 15
XXH
XXH
XXH
.
.
.
.
...
.
.
.
.
...
0001
XX
XX
Overlay Color 1
XXH
XXH
XXH
0000
00
00
24-Bit True-Color
R7–R0
G7–G0
B7–B0
0000
00
01
24-Bit True-Color
R7–R0
G7–G0
B7–B0
0000
00
10
24-Bit True-Color
R7–R0
G7–G0
B7–B0
0000
00
11
Reserved
Reserved
Reserved
Reserved
0000
01
00
24-Bit True-Color Bypass
R7–R0
G7–G0
B7–B0
0000
01
01
24-Bit True-Color Bypass
R7–R0
G7–G0
B7–B0
0000
01
10
24-Bit True-Color Bypass
R7–R0
G7–G0
B7–B0
0000
01
11
Reserved
Reserved
Reserved
Reserved
0000
10
00
8-Bit Pseudo-Color (Red)
P7–P0
Ignored
Ignored
0000
10
01
8-Bit Pseudo-Color (Green)
Ignored
P7–P0
Ignored
0000
10
10
8-Bit Pseudo-Color (Blue)
Ignored
Ignored
P7–P0
0000
10
11
15-Bit True-Color
Orrrrrgg
gggbbbbb
Ignored
0000
11
00
8-Bit True-Color Bypass (Red)
rrrgggbb
Ignored
Ignored
0000
11
01
8-Bit True-Color Bypass (Green)
Ignored
rrrgggbb
Ignored
0000
11
10
8-Bit True-Color Bypass (Blue)
Ignored
Ignored
rrrgggbb
0000
11
11
15-Bit True-Color Bypass
Orrrrrgg
gggbbbbb
Ignored
X = Don’t Care
CONTROL OUTPUTS
THESE BITS ARE OUTPUT
ONTO THE CR3-CR0 PINS
CR5
0
1
0 IRE
7.5 IRE
PEDESTAL ENABLE
CONTROL (SETUP)
CR4
0
1
6-BIT
8-BIT
8-BIT/6-BIT
COLOR SELECT
COLOR MODE
SELECT
(SEE TABLE III)
CR5
CR4
CR3
CR2
CR1
CR7
CR6
CR0
Figure 4. Command Register (CR)


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