High-Definition Multimedia Interface (HDMI)

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Image:connector_hdmi_connector.png 19 pin HDMI type A connector.

HDMI provides an interface between any compatible digital audio/video source and a compatible digital audio and/or video monitor.

The standard Type A HDMI connector has 19 pins, and a higher resolution version called Type B, has been defined, although it is not yet in common use. Type B has 29 pins, allowing it to carry an expanded video channel for use with high-resolution displays. Type-B is designed to support resolutions higher than 1080p.

Type A

Pin Signal Description
1 TMDS Data2+
2 TMDS Data2 Shield
3 TMDS Data2–
4 TMDS Data1+
5 TMDS Data1 Shield
6 TMDS Data1–
7 TMDS Data0+
8 TMDS Data0 Shield
9 TMDS Data0–
10 TMDS Clock+
11 TMDS Clock Shield
12 TMDS Clock–
13 CEC
14 Reserved N.C. on device
15 SCL
16 SDA
17 DDC/CEC Ground
18 +5 V Power
19 Hot Plug Detect

Type B

Pin Signal Description
1 TMDS Data2+
2 TMDS Data2 Shield
3 TMDS Data2-
4 TMDS Data1+
5 TMDS Data1 Shield
6 TMDS Data1-
7 TMDS Data0+
8 TMDS Data0 Shield
9 TMDS Data0-
10 TMDS Clock+
11 TMDS Clock Shield
12 TMDS Clock-
13 TMDS Data5+
14 TMDS Data5 Shield
15 TMDS Data5-
16 TMDS Data4+
17 TMDS Data4 Shield
18 TMDS Data4-
19 TMDS Data3+
20 TMDS Data3 Shield
21 TMDS Data3-
22 CEC
23 Reserved (N.C. on device)
24 Reserved (N.C. on device)
25 SCL
26 SDA
27 DDC/CEC Ground
28 +5V
29 Hot Plug Detect

Notes

  • TMDS channel carries audio, video and auxiliary data.
  • Signalling method: According to DVI 1.0 spec. Single-link (Type A HDMI) or dual-link (Type B HDMI).
  • Video pixel rate: 25 MHz to 165 MHz (Type A) or to 330 MHz (Type B).
  • Video formats with rates below 25 MHz (e.g. 13.5 MHz for 480i/NTSC) transmitted using a pixel-repetition scheme.
  • Up to 24 bits per pixel can be transferred, regardless of rate.
  • Supports 1080p60.
  • Pixel encodings: RGB 4:4:4, YCbCr 4:4:4 (8 bits per component); YCbCr 4:2:2 (12 bits per component).
  • Audio sample rates: 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96kHz, 176.4 kHz, 192 kHz, up to 8 audio channels .
  • Type A HDMI is backward-compatible with the single-link Digital Visual Interface (DVI) used on modern computer monitors and graphics cards. This means that a DVI source can drive an HDMI monitor, or vice versa, by means of a suitable adapter or cable, but the audio and remote control features of HDMI will not be available. Additionally, without support for HDCP, the video quality and resolution may be artificially downgraded by the signal source to prevent the end user from viewing or especially copying restricted content. Type B HDMI is similarly backward-compatible with dual-link DVI.

References

Category:Computer Video Connectors

 

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