GS4910B datasheet(50/119 Pages) GENNUM

No. de pieza	GS4910B

Descripción Electrónicos	HD/SD/Graphics Clock and Timing Generator with GENLOCK

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Fabricante Electrónico	GENNUM [Gennum Corporation]

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50 / 119 page

GS4911B/GS4910B HD/SD/Graphics Clock and Timing

Generator with GENLOCK

Data Sheet

36655 - 5

June 2009

50 of 119

3.6 Genlock

When both the REF_LOST output and the GENLOCK input are LOW, the device will

attempt to genlock the output clock and timing signals to the input reference.

NOTE: The user must apply a reference to the input of the device prior to setting

GENLOCK = LOW. If the GENLOCK pin is set LOW and no reference signal is present, the

generated clock and timing outputs of the device may correspond to the internal default

settings of the chip until a reference is applied.

The device will first attempt to automatically genlock the output to the input reference.

This automatic locking process is described in Section 3.6.1 on page 50. If the output

format selected is such that it is not commonly genlocked to the input reference, the

GS4911B/GS4910B will not automatically lock. In this case, the user may program

designated registers to manually allow locking to occur. The manual locking process is

described in Section 3.6.2 on page 54.

The user may disable one or more of the recognized input standards from being used to

genlock the output by setting the Reference_Standard_Disable register located at

address 11h - 14h of the host interface. If a reference is applied that is disabled in the

Reference_Standard_Disable register, both the automatic and manual locking process

will fail when the application layer sets GENLOCK = LOW.

NOTE: If the device is already genlocked to an input reference and the applied standard

is subsequently disabled in the Reference_Standard_Disable register, the device will

remain locked.

3.6.1 Automatic Locking Process

The behaviour of the device when attempting to automatically genlock will depend on

the status and format of the input reference with respect to the selected output format.

VID_STD[5:0] = 1 to 51:

Once reference validity is established and the reference format is recognized, the device

uses an internal cross-reference genlock look-up table to determine whether the input

can be used to genlock the output. A simplified version of this look-up table is shown in

Table 3-4. The table represents a matrix with the VID_STD[5:0] number representation

of each possible reference format along the top axis, and the VID_STD[5:0]

representation of each possible output timing format along the vertical axis. A shaded

box indicates that the output format can be automatically genlocked to the input

reference.

If the device determines that the output can be automatically genlocked to the input

reference, it will lock the output format to the reference, adjust the output timing signals

based on the genlock timing offset registers (Section 3.2.1.1 on page 38), and then set the

LOCK_LOST pin LOW.

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GS4910B Datasheet(PDF) 50 Page - Gennum Corporation

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