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| 型号： | AD9985BSTZ-110 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | IC INTERFACE 8BIT 110MSPS 80LQFP |
| 标准包装： | 1 |
| 应用： | 视频 |
| 接口： | 串行 |
| 电源电压： | 2.2 V ~ 3.45 V |
| 封装/外壳： | 80-LQFP |
| 供应商设备封装： | 80-LQFP（14x14） |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
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AD9985
Rev. 0 | Page 21 of 32
MODE CONTROL 1
0E
7
Hsync Input Polarity Override
This register is used to override the internal circuitry
that determines the polarity of the Hsync signal going
into the PLL.
Table 13. Hsync Input Polarity Override Settings
Override Bit
Function
0
Hsync Polarity Determined by Chip
1
Hsync Polarity Determined by User
The default for Hsync polarity override is 0 (polarity
determined by chip).
0E
6
HSPOL Hsync Input Polarity
A bit that must be set to indicate the polarity of the
Hsync signal that is applied to the PLL Hsync input.
Table 14. Hsync Input Polarity Settings
HSPOL
Function
0
Active Low
1
Active High
Active Low means the leading edge of the Hsync pulse
is negative going. All timing is based on the leading
edge of Hsync, which is the falling edge. The rising
edge has no effect.
Active high is inverted from the traditional Hsync,
with a positive-going pulse. This means that timing
will be based on the leading edge of Hsync, which is
now the rising edge.
The device will operate if this bit is set incorrectly, but
the internally generated clamp position, as established
by Clamp Placement (Register 05H), will not be
placed as expected, which may generate clamping
errors.
The power-up default value is HSPOL = 1.
0E
5
Hsync Output Polarity
This bit determines the polarity of the Hsync output
and the SOG output. Table 15 shows the effect of this
option. SYNC indicates the logic state of the sync
pulse.
Table 15. Hsync Output Polarity Settings
Setting
SYNC
0
Logic 1 (Positive Polarity)
1
Logic 0 (Negative Polarity)
The default setting for this register is 0.
0E
4
Active Hsync Override
This bit is used to override the automatic Hsync
selection, To override, set this bit to Logic 1. When
overriding, the active Hsync is set via Bit 3 in this
register.
Table 16. Active Hsync Override Settings
Override
Result
0
Autodetermines the Active Interface
1
Override, Bit 3 Determines the Active Interface
The default for this register is 0.
0E
3
Active Hsync Select
This bit is used under two conditions. It is used to
select the active Hsync when the override bit is set
(Bit 4). Alternately, it is used to determine the active
Hsync when not overriding but both Hsyncs are
detected.
Table 17. Active HSYNC Select Settings
Select
Result
0
HSYNC Input
1
Sync-on-Green Input
The default for this register is 0.
0E
2
Vsync Output Invert
This bit inverts the polarity of the Vsync output.
Table 18 shows the effect of this option.
Table 18. Vsync Output Invert Settings
Setting
Vsync Output
0
Invert
1
No Invert
The default setting for this register is 0.
0E
1
Active Vsync Override
This bit is used to override the automatic Vsync
selection. To override, set this bit to Logic 1. When
overriding, the active interface is set via Bit 0 in this
register.
Table 19. Active Vsync Override Settings
Override
Result
0
Autodetermines the Active Vsync
1
Override, Bit 0 Determines the Active Vsync
The default for this register is 0.
0E
0
Active Vsync Select
This bit is used to select the active Vsync when the
override bit is set (Bit 1).
Table 20. Active Vsync Select Settings
Select
Result
0
Vsync Input
1
Sync Separator Output
The default for this register is 0.
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