Video Decoder Select and Write Enables | Texas Instruments TVP5158

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	Table 11. Property Sheet Button Controls

Button	Definition

	Writes to all writeable registers whose data has changed. A register is flagged as changed if the value to be
OK	written is different from the value last read from that address.
	Closes the dialog.

	Causes all changes made to the property page since the last Apply to be discarded. Changes made to dialog
	controls with 'immediate hardware update'are not discarded, because they have already been changed in
Cancel	hardware.
	Does not write to hardware.
	Closes the dialog.

	Writes to all writeable registers whose data has changed. A register is flagged as changed if the value to be
Apply	written is different from the value last read from that address.
	Does not close the dialog.

8.3.1Property Sheet Refresh

The property sheets were designed so that the data displayed is always current. Certain actions cause the entire register map to be read from the device and to update the property sheets. This happens when:

•Property sheets are initially opened.

•When tabbing from one page to another.

•When Read All is clicked.

•When making the Property Sheets window the active window (by clicking on it).

•When making a Register Map Editor window the active window (by clicking on it).

8.4Video Decoder Select and Write Enables

The VCC main window contains controls for accessing the four video decoders within the TVP5158. The buttons under “Selected Video Decoder Core” are mutually exclusive. Four sets of the various editing tools (Register Map Edit and Property Sheets) exist in memory, but only the data for the selected video decoder can be seen. Any or all of the write enable buttons can be enabled. These control which of the video decoders will accept I2C writes.

8.4.1Broadcast Write Access

This is the default configuration as shown in Figure 19. All four decoders are enabled for I2C writes. All I2C writes done using the Edit Register Map, Property Sheets, or System Initialization tools will affect all video decoders.

8.4.2Single Video Decoder Write Access

This configuration is used to program unique settings for one video decoder without effecting the others. The “Set write enable for selected decoder only” check box should be checked as shown in Figure 20. This provides a shortcut, so that as each decoder is selected using the decoder buttons, the same decoder is also enabled for writes (and the other three are disabled for writes).

8.4.3Arbitrary Video Decoder Write Access

This configuration is used to program the write enabled video decoder(s) in any combination. The “Set write enable for selected decoder only” check box should be unchecked.

NOTE: The command files used by the System Initialization tool can override the write enable button settings. They are generally setup for writing to all decoders independent of the current write enable buttons setting.

SLEU108 –November 2009	TVP5158 Evaluation Module	27
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TVP5158 specifications

The Texas Instruments TVP5158 is a highly versatile and efficient video decoder designed for a range of video processing applications. It serves as an excellent solution for converting analog video signals into digital formats for further processing. The device is commonly utilized in surveillance systems, video conferencing equipment, and various multimedia applications where reliable and high-quality video output is necessary.

One of the primary features of the TVP5158 is its ability to accept multiple video formats, including NTSC, PAL, and SECAM. This flexibility makes it suitable for a global market where different standards are employed. The device can handle up to four composite video inputs, allowing users to connect multiple sources and switch between them as needed seamlessly. The integrated multiplexing capability makes the TVP5158 an excellent choice for applications that require real-time processing of various video sources.

The TVP5158 also incorporates advanced noise reduction technology, which enhances the quality of the output video by minimizing artifacts and disturbances that may affect the viewing experience. This feature is particularly beneficial in situations where video signals may be degraded due to environmental factors. Additionally, the chip includes capabilities for automatic gain control, which helps adjust the signal levels to maintain consistent output quality.

Another significant characteristic of the TVP5158 is its built-in color space conversion. The device can transform the incoming video signals from YCbCr to RGB or vice versa, ensuring compatibility with a wide range of display systems and digital video formats. This feature is essential for applications that work with various video standards and require high fidelity in color representation.

The TVP5158 is designed for low power consumption, making it ideal for battery-operated devices and systems where energy efficiency is crucial. Its small footprint and integration capabilities also allow for easier design and implementation within existing systems without requiring extensive space or additional components.

In summary, the Texas Instruments TVP5158 is a robust video decoder that offers a rich set of features, including support for multiple video formats, advanced noise reduction, automatic gain control, and color space conversion. Its low power requirements and compact design make it an attractive choice for a variety of applications, positioning it as a reliable solution for modern video processing needs.

Table 11. Property Sheet Button Controls

Button

Definition