ST

The STDP4320 is a high-speed DisplayPort dual mode splitter IC targeted for audio-video de-multiplexing and routing in applications such as notebooks, docking stations, video hub, 4K2K TVs, daisy chainable monitors, digital signage, etc. It consists of one dual mode input port and two dual mode output ports configurable as either DisplayPort or HDMI/DVI. STDP4320 is a VESA DP Standard Ver. 1.2a compliant device that supports advanced features such as MST, HBR2, 3D formats and GTC assist. Designs based on STDP4320 have the flexibility to offer either DP or HDMI/DVI connectors on its end product to interface with legacy and new generation video sources and sinks. In addition, STDP4320-based products with a DisplayPort output connector are DP++ compliant and work with any HDMI or single link DVI sink through a passive level translator (dongle).

The STDP4320 uses ST's latest generation DisplayPort dual mode receiver and transmitter technology that supports both DisplayPort and TMDS signal formats. This device receives MST format up to eight audio-video streams, which can be further routed on either of the two outputs in any combination of eight streams depending on the capability of downstream sinks. This device can also replicate the incoming video streams on both output ports simultaneously, thus allowing cloning on two downstream sinks. For example, a 4K2K 60 Hz video input is replicated on two output ports simultaneously. The DisplayPort receiver and transmitters support HBR2 speed, a data rate of 5.4 Gbps per lane with a total bandwidth of 21.6 Gbps link rate. In HDMI mode, this device supports link rate up to 3.2 Gbps that corresponds to pixel rate of 320 MHz, adequate for supporting video resolution up to FHD 120 Hz with all 3D formats. The device is also capable of delivering deep color video up to 16-bits per color. The STDP4320 allows audio transport from the source to the desired audio rendering devices over the video output port or through an SPDIF port.

The STDP4320 supports RGB and YCbCr colorimetric formats with color depth of 16, 12, 10, and 8 bits. The STDP4320 features the HDCP 1.3 content protection scheme with embedded keys for secure transmission of protected audio-video content. It also operates as an HDCP repeater for the downstream sinks.

The DDC ports in the STDP4320 allow the upstream source to access EDID and transfer MCCS commands to downstream sinks when the physical ports are either HDMI or DVI type. If both the upstream source and downstream sinks are DP type, I2C transactions take place over the AUX CH. If one of them is DP type and the other is either HDMI or DVI type, STDP4320 converts the I2C over AUX message protocol to I2C commands and sends it on the DDC port. The device has an on-chip microcontroller with SPI, UART, and I2C interface. The STDP4320 uses an external SPI Flash ROM for storing device configuration firmware. It has an I2C slave port for external host communication. Other system interface signals include the CEC and general-purpose IO for source, sink communication, detection, monitoring, etc. When the downstream sink is disconnected, STDP4320 automatically turns off the inactive port for power saving purposes.

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