1.

General description

CBTL04DP211 is an (Embedded) DisplayPort multiplexer for DisplayPort v1.1a switching

and multiplexing applications on PC platforms. It is capable of 1 : 2 switching or

2 : 1 multiplexing of 2-lane DisplayPort Main Link signals, using high-bandwidth pass-gate

technology. Also, it can switch/multiplex Hot Plug Detect (HPD) signal and AUX signals,

for a total of four channels on the display side.

To facilitate DisplayPort switching/multiplexing scheme on PC platforms suitably,

CBTL04DP211 provides two separate selection pins (GPU_SEL, AUX_SEL). The

selection pin GPU_SEL performs switching from one Main Link to another Main Link. HPD

signals will also be switched using the same selection pin. A separate select pin

(AUX_SEL) provides additional selection between two AUX channels such that the AUX

channel selection is independent of the Main Link and HPD signal selection.

A typical application of CBTL04DP211 is on motherboards where one of two GPU/CPU

display sources needs to be selected to connect to a DisplayPort sink device or connector.

A controller chip selects which path to use by setting a select signal HIGH or LOW. Due to

the non-directional nature of the signal paths (which use high-bandwidth pass-gate

technology), the CBTL04DP211 can also be used in the reverse topology, e.g., to connect

one DisplayPort source device to one of two DisplayPort sink devices or connectors.

2.

Features and benefits

Main Link signals

 6 mm, 0.4 mm pitch HVQFN32 package

CBTL04DP211

DisplayPort 2 : 1 multiplexer

Rev. 1 — 30 March 2011

Product data sheet