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參數(shù)資料
| 型號： | GS4901BCNE3 |
| 廠商： | Gennum Corporation |
| 英文描述： | SD Clock and Timing Generator with GENLOCK |
| 中文描述： | 統(tǒng)計時鐘和定時發(fā)生器鎖相 |
| 文件頁數(shù)： | 42/95頁 |
| 文件大?。?/td> | 898K |
| 代理商： | GS4901BCNE3 |
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GS4901B/GS4900B Preliminary Data Sheet
37703 - 0
April 2006
42 of 95
3.5 Reference Format Detector
The reference format detector checks the validity and analyzes the format of the
input reference signal. It is designed to accurately differentiate between 59.94 and
60Hz frame rates.
As described in
Section 1.4 on page 20
, the GS4901B / GS4900B will
automatically recognize the SD video standards defined by VID_STD[5:0] = 1 to
10. However, in order to enable the device to recognize and lock to any of the HD
reference formats defined by VID_STD[5:0] = 11 to 38, the user must set the
corresponding bit LOW in the Reference_Standard_Disable register, located at
address 11h-13h of the host interface. The user must also set the
HD_Reference_Enable bit of register 82h[7] HIGH. See the description of the
Reference_Standard_Disable and HD_Reference_Enable registers in
Section 3.10.3 on page 66
.
3.5.1 Horizontal and Vertical Timing Characteristic Measurements
When a reference signal is applied to the designated input pins, the
GS4901B/GS4900B will analyse the signal and report the following in registers
0Ah to 0Eh of the host interface:
the number of 27MHz clock pulses between leading edges of the H input
reference signal (H_Period register)
the number of 27MHz clock pulses in 16 horizontal periods (H_16_Period
register)
the number of H reference pulses between leading edges of the V input
reference signal (V_Lines register)
the number of H reference pulses in two vertical periods (V_2_Lines register)
the number of H reference pulses in one F period (F_Lines register)
These parameters may be read via the host interface and are used by the device
to determine reference signal validity.
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| GS4910B | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:HD/SD/Graphics Clock and Timing Generator with GENLOCK |
| GS4910BCNE3 | 功能描述:IC RE-TIMER RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1,500 系列:- 類型:時鐘緩沖器/驅(qū)動器 PLL:是 主要目的:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 電源電壓:3.3V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:帶卷 (TR) 其它名稱:93786AFT |
| GS4911ACNE3 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Gennum Corporation 功能描述: |
| GS4911B | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:HD/SD/Graphics Clock and Timing Generator with GENLOCK |
| GS4911B_09 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:HD/SD/Graphics Clock and Timing Generator with GENLOCK |
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