SiI9022ACNU Transmitter

SiI9022ACNU General Description

The Lattice Semiconductor SiI9022A/SiI9024A HDMI® transmitter, which can be integrated into various mobile devices, offers extensive support for the High-Definition Multimedia Interface (HDMI) Specification. Using the flexible audio and video interfaces provided by this ultra-low-power solution, digital still cameras, high-definition camcorders and personal mobile devices can be connected directly to a large installed base of DVI PC monitors and HDMI TVs.

This transmitter, a better version of the SiI9022/SiI9024 device, is the next generation in its family. Compared to its predecessor, it uses less power and has more modern features. The SiI9024A transmitter has fully self-sequencing HDCP detection and authentication, including SHA-1 for repeaters, and the HDCP keys are already pre-programmed into it. The HDCP keys are additionally encrypted. The device supports HDCP, or High-bandwidth Digital Content Protection, for use by other devices that demand the delivery of certain content.

Video Input

• xvYCC metadata support
• BTA-T1004 video input format
• Integrated color space converter allows direct connection to all significant MPEG decoders, including those that provide only an ITU-R.656 output
• Internal DE generator supports non-embedded sync formats

Control Capability

• The Consumer Electronics Control (CEC) interface includes a hardware protocol and arbitration logic-enabled CEC I/O that is HDMI-compliant and does not need external calibration. Two separate circuits—the Hot Plug and the Receiver Sense—are used for monitoring device detection.
• Single slave I2C from the host, passing through to master I 2C interface for DDC connection, simplifies board layout and lowers the cost
• Supports the SiI9020 transmitter registers by default for compatibility with older software.

Functional Description

Transmitting digital audio and video that complies with HDMI is made simple with the SiI9022A/SiI9024A HDMI transmitter. The transmitter has specialized audio and video processing, making it simple and affordable to upgrade consumer electronics devices to support HDMI.

● Input Clock Multiplier/Divider

You can divide by two, multiply by two, or by four by the input pixel clock (multiplied by 0.5). The HDMI link can transmit video input formats that use a 1x clock (such as YC Mux mode). The same is true for the conversions from 1x to 2x, 1x to 4x, and 2x to 4x.

● Embedded Sync Decoding

The transmitter can generate the HSYNC, DE, and VSYNC signals anywhere between the start of the active video (SAV) and the end of the active video (EAV) codes in a video stream in ITU-R BT.656 format.

● Enabling Data Maker.

With the incoming HSYNC signal, the transmitter has the necessary logic to produce a Data Enable (DE) movement and IDCK. This signal is used to correct the timing obtained from the sync extraction to comply with the CEA-861D timing specifications. The DE signal can determine the extent of the currently active display area through register programming. This feature is beneficial when connecting the transmitter to MPEG decoders that do not provide a specific DE output signal because it allows for more flexibility.

● Color Space Converter

To interface with the numerous video formats that AV processors make available and to provide full DVI 1.0 backward compatibility, There are two known color space converters (CSCs): one that converts YCbCr to RGB and another that converts RGB to YCbCr. By setting the appropriate registers, the CSC can be configured to carry out conversions of the standard definition (ITU.601) or high definition (ITU.709).

● Audio Data Capture Logic

The SiI9022A/SiI9024A chip, which comes in 81-ball and 72-pin packages, has separate inputs for S/PDIF and I2 S (SD[3:0]). Digital audio can be put in through these ports.

The audio output of the 49-ball SiI9022A/SiI9024A transmitter is constrained in some ways because both the S/PDIF and DE inputs use ball G6. This is because the number of leads has gone down. When the system is set up to use S/PDIF, either the DE generator mode or one of the YC 4:2:2 embedded sync formats must be used for the video format. Both of these modes can’t be used at the same time.

● I 2C Slave Interface

Slave in nature, the transmitter’s controller I2C interface (signals CSCL and CSDA) can accept inputs of up to 4.0 V and operate at frequencies between 40 kHz and 400 kHz. The host uses this interface to set up the transmitter by reading and writing to registers.

● Control and Configuration

All the registers needed for managing and configuring the transmitter are included in the register/configuration logic block. A different logic block handles the CEC subsystem’s setup and maintenance.

● DDC Master I2C Interface

The HDMI cable can be connected directly to the transmitter via its master I2C port. To perform read/write operations on a DDC, the transmitter must access and modify a set of registers. This attribute reduces complexity in the system’s design, which in turn helps to cut costs.

● Hot Plug Detection Logic

If the SiI9022A/SiI9024A transmitter is plugged into a receiver, the Hot Plug Detection Logic block will activate. With the HPD signal HIGH, the sender knows the connected receiver’s EDID can be read. When describing voltage, 2.0 V is considered HIGH, while 0.8 V is considered LOW.

● HDCP Encryption Engine.

The HDCP encryption engine powers your encrypted audio and video streams, which has capabilities like repeater checks and HDCP authentication. The microcontroller or microprocessor of the system manages the encryption process by sequentially reading and writing registers. An on-board algorithm creates a number by XORing HDCP keys with a Key Selector Value (KSV) read from ROM. In this process, audio and video are encrypted frame-by-frame.

● HDCP Key ROM (SiI9024A Device Only)

The SiI9024A transmitter has had its ROM pre-programmed by the manufacturer with the HDCP production keys. System manufacturers must not buy key sets from Digital Content Protection LLC. All aspects of the HDCP keys, from acquisition to programming and ongoing protection, fall under the purview of Lattice Semiconductor. Pre-programmed HDCP keys provide the highest level of security because they can’t be read once the devices have been set up.

Conclusion

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