參數(shù)資料
型號(hào)： GS4910BCNE3
廠商： Gennum Corporation
英文描述： HD/SD/Graphics Clock and Timing Generator with GENLOCK
中文描述： 高清/標(biāo)清/圖形時(shí)鐘和定時(shí)發(fā)生器鎖相
文件頁(yè)數(shù)： 55/113頁(yè)
文件大?。?/td> 1017K
代理商： GS4910BCNE3
GS4911B/GS4910B Data Sheet
36655 - 2
April 2006
55 of 113
where:
f
out
= output video clock frequency
f
Href
= reference H pulse frequency on HSYNC
H_Feedback_Divide = numerator of the divide ratio (host register 28h-29h)
H_Reference_Divide = denominator of the divide ratio (host register 2Ah-2Bh)
Before programming H_Feedback_Divide and H_Reference_Divide, the
numerator and denominator must be reduced to their lowest factors.
For example, to manually genlock an output format with a 74.25MHz video clock to
a reference with a 27MHz video clock and 1716 clocks per line, the following
calculations are necessary:
Therefore, program H_Feedback_Divide
= 4719 and H_Reference_Divide = 1.
Output Line/Frame Reset Host Registers
In addition to programming H_Feedback_Divide and H_Reference_Divide, the
user must also define the ratio of the output frame rate to the reference frame rate.
The denominator of this ratio is programmed in the Output_FV_Reset register at
address 18h of the host interface. Before Output_FV_Reset is programmed, the
numerator and denominator must be reduced to their lowest factors. Two
examples are demonstrated below:
Example 1: the reference has a frame rate of 30Hz and the output frame rate is
50Hz:
Therefore, program Output_FV_Reset = 3. The numerator does not have to be
programmed.
Example 2: the reference has a frame rate of 29.97Hz and the output frame rate is
50Hz:
Therefore, program Output_FV_Reset = 600. The numerator does not have to be
programmed.
Additionally, the Frame_Divider_Reset register (address19h) must be configured
to initialize the counter reset programmed in register 18h.
f
Href
1716
---27
MHz
=
H_Reference_Divide
H_Feedback_Divide
MHz
1716
---27
MHz
74.25
74.25
27
1716
×
27
127413
1
4719
=
=
=
=
∴
Input Frame Rate
Output Frame Rate
30
50
5
3
=
=
Input Frame Rate
Output Frame Rate
29.97
--50
600
1001
=
=
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
GS4911BCNE3 功能描述:IC RE-TIMER RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 專用 系列:- 標(biāo)準(zhǔn)包裝:1,500 系列:- 類型:時(shí)鐘緩沖器/驅(qū)動(dòng)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
GS4915 制造商:GENNUM 制造商全稱:GENNUM 功能描述:ClockCleaner
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