參數(shù)資料
型號： AD9985
廠商： Analog Devices, Inc.
英文描述： 110 MSPS/140 MSPS Analog Interface for Flat Panel Displays
中文描述： 110 MSPS/140 MSPS的模擬接口的平板顯示器
文件頁數(shù)： 24/32頁
文件大小： 349K
代理商： AD9985
AD9985
Table 33. Detected Hsync Input Polarity Status
Hsync Polarity
Status
0
Negative
1
Positive
Rev. 0 | Page 24 of 32
Result
14
4
Vsync Detect
This bit is used to indicate when activity is detected on
the Vsync input pin (Pin 31). If Vsync is held steady
high or low, activity will not be detected.
Table 34. Vsync Detection Results
Detect
Function
0
No Activity Detected
1
Activity Detected
The Sync Processing Block Diagram (Figure 14) shows
where this function is implemented.
14
3
This bit indicates which Vsync source is being used:
the Vsync input or output from the sync separator.
Bit 4 in this register determines which is active. If both
Vsync and SOG are detected, the user can determine
which has priority via Bit 0 in Register 0EH. The user
can override this function via Bit 1 in Register 0EH. If
the override bit is set to Logic 1, this bit will be forced
to whatever the state of Bit 0 in Register 0EH is set to.
Table 35. Active Vsync Results
Bit 4, Reg 14H
Bit 1, Reg 0EH
(Vsync Detect)
(Override)
1
0
0
0
X
1
AVS – Active Vsync
AVS
0
1
Bit 0 in 0EH
AVS = 0 means Vsync input.
AVS = 1 means Sync separator.
The override bit is in Register 0EH, Bit 1.
14
2
This bit reports the status of the Vsync output polarity
detection circuit. It can be used to determine the
polarity of the Vsync output. The detection circuit’s
location is shown in the Sync Processing Block
Diagram (Figure 14).
Table 36. Detected Vsync Output Polarity Status
Vsync Polarity Status Result
0
Active Low
1
Active High
Detected Vsync Output Polarity Status
14
1
This bit is used to indicate when sync activity is
detected on the Sync-on-Green input pin (Pin 49).
Sync-on-Green Detect
Table 37. Sync-on-Green Detection Results
Detect
Function
0
No Activity Detected
1
Activity Detected
The Sync Processing Block Diagram (Figure 14) shows
where this function is implemented.
14
0
This bit reports the status of the Coast input polarity
detection circuit. It can be used to determine the
polarity of the Coast input. The detection circuit’s
location is shown in the Sync Processing Block
Diagram (Figure 14).
Table 38. Detected Coast Input Polarity Status
Polarity Status
Result
0
Coast Polarity Negative
1
Coast Polarity Positive
Detected Coast Polarity Status
This indicates that Bit 1 of Register 5 is the 4:2:2
output mode select bit.
15
1
This bit configures the output data in 4:2:2 mode. This
mode can be used to reduce the number of data lines
used from 24 down to 16 for applications using YUV,
YCbCr, or YPbPr graphics signals. A timing diagram
for this mode is shown in Figure 11.
4:2:2 Output Mode Select
Recommended input and output configurations are
shown in Table 39.
Table 39. 4:2:2 Output Mode Select
Select
Output Mode
0
4:2:2
1
4:4:4
Table 40. 4:2:2 Input/Output Configuration
Input
Channel
Connection
Red
V
Green
Y
Blue
U
Output Format
U/V
Y
High Impedance
19
7:0
Red Target Code
This specifies the targeted value of the final offset for
the Red channel when auto offset is employed
(Register 0x1D Bit 7 = 1). Default is 4.
1A
7:0
Green Target Code
This specifies the targeted value of the final offset for
the Green channel when auto offset is employed
(Register 0x1D Bit 7 = 1). Default is 4.
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