Description

STDP4028

2/7

Doc ID 15886 Rev 1

1

Description

The STDP4028 is a DisplayPort transmitter IC for the secure transmission of high-

bandwidth, uncompressed digital audio-video signals targeted for applications such as DTV,

LCD monitor, docking station, and other types of display systems. STDP4028 is a VESA DP

1.1a and eDP compliant device, implementing a single link DisplayPort output port

comprising four main lanes, auxiliary channel and HPD. In addition to the standard HBR (2.7

Gbps) and RBR (1.62 Gbps) speeds, this device supports “turbo” speed of 3.24 Gbps per

lane with a total link bandwidth of 12.96 Gbps. The higher bandwidth provides unique

benefits to users over other commercial DP transmitters for embedded applications by

offering additional margin to support higher color depth, resolution, and refresh rate. For

example, STDP4028 supports FHD non-reduced blanking video (1080p 30-bit color per

pixel) at 120 Hz, plus 7.1 Ch audio in two-box TV applications. The high-speed auxiliary

channel in STDP4028 acts as a bidirectional communication link, supporting application-

specific protocols such as MCCS, DDC, UART, IR, as well as, the dedicated DisplayPort link

training and device management functions.

The STDP4028 supports RGB and YCC video color formats with color depth of 12 (YCC

4:2:2 only), 10, and 8 bits. This device offers LVDS and LVTTL input interface configurable to

map a wide range of display controller products. The Quad LVDS interface supports video

signals up to 400 MHz pixel rate with flexible channel and lane swapping options. The 60-bit

LVTTL input ports on STDP4028 can be mapped to transfer video data either in two pixels

per clock or single pixel per clock of a chosen color depth. The STDP4028 also supports

both compressed and uncompressed audio formats. This device comprises four I2S audio

inputs, supporting up to 8 channels LPCM audio and a single wire SPDIF input for encoded

audio. The STDP4028 features HDCP 1.3 content protection scheme with an embedded key

option for secure transmission of digital audio-video content. In addition, it supports the

HDCP repeater function and, thus acts as a downstream transmitter suitable for two-box TV

and HDMI/DVI to DP converter applications.

The STDP4028 can be configured by an external host through the I2C host interface. This

IC also includes general purpose inputs/outputs that can be used for controlling system

components. The STDP4028 features a color space converter (RGB to YCC and YCC to

RGB) for flexible interface with external video processing devices.

Figure 1.

System diagram

DisplayPort

STDP4028

STDP4028

LVDSx4

TTL (60 bits)

Video/Audio

Processor

I2S (8 CH)/

SPDIF

27 MHz

crystal

I2C for Host

Interface and

I2C-over-AUX