REF: BBONEBLK_SRM
BeagleBone Black System
Reference Manual
Rev A5.2
Page 63 of 108
6.9
HDMI Interface
The BeagleBone Black has an onboard HDMI framer that converts the LCD signals and
audio signals to drive a HDMI monitor. The design uses an NXP
TDA199988
HDMI
Framer.
The following sections provide more detail into the design of this interface.
6.9.1
Supported Resolutions
The maximum resolution supported by the BeagleBone Black is 1280x1024 @ 60Hz.
Table 8
below shows the supported resolutions. Not all resolutions may work on all
monitors, but these have been tested and shown to work on at least one monitor. EDID is
supported on the BeagleBone Black. Based on the EDID reading from the connected
monitor, the highest compatible resolution is selected.
Table 8.
HDMI Supported Monitor Resolutions
800 x 600 @60Hz
1024 x 768 @75Hz 1280 x 720 @60
800 x 600 @56Hz
1024 x 768 @70Hz
640 x 480 @75Hz
1024 x 768 @60Hz
640 x 480 @60Hz
800 x 600 @75Hz
720 x 400 @70Hz
800 x 600 @72Hz
1280 x 1024 @75Hz 720 x 480 @60Hz
6.9.2
HDMI Framer
The
TDA19988
is a High-Definition Multimedia Interface (HDMI) 1.4a transmitter. It is
backward compatible with DVI 1.0 and can be connected to any DVI 1.0 or HDMI sink.
The HDCP mode is not used in the design. The non-HDCP version of the device is used
in the BeagleBone Black design.
This device provides additional embedded features like CEC (Consumer Electronic
Control). CEC is a single bidirectional bus that transmits CEC over the home appliance
network connected through this bus. This eliminates the need of any additional device to
handle this feature. While this feature is supported in this device, as of this point, the SW
to support this feature has not been implemented and is not a feature that is considered
critical.
It can be switched to very low power Standby or Sleep modes to save power when HDMI
is not used. TDA19988 embeds I
2
C-bus master interface for DDC-bus communication to
read EDID. This device can be controlled or configured via I
2
C-bus interface.
