tda19978bhv NXP Semiconductors, tda19978bhv Datasheet - Page 13

• Manufacturer Part Number: tda19978bhv
• Description: Quad Hdmi 1.3a Receiver Interface With Equalizer Hdtv Up To 1080p, Up To Uxga For Pc Formats
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA19978B_1
Product data sheet
8.12 Sync timing measurement
8.13 Format measurement timing
8.14 Color space conversion
8.15 4:2:2 downsampling filters
8.16 Range control
8.17 Dithering function
To assist input format recognition, the vertical/horizontal periods and the horizontal pulse
width are measured based on the externally generated MCLK frequency (27 MHz crystal).
This function has an accuracy of 1 LSB = 1
The TDA19978B includes an improved system for accurate recognition of PC and TV
formats. This system measures the parameters of blanking and video active area.
This function can be useful for example when the TDA19978B receives PC format data in
HDMI or DVI modes.
The color space conversion enables an RGB signal from the HDMI input to be converted
into a YCbCr signal or converting the YCbCr signal from the HDMI input into an RGB
signal. The color space conversion formula is:
Activation of the color space conversion function and programming of all coefficients and
offsets is done via the I
These filters downsample the Cb and Cr signals by a factor of 2. A delay has been added
to the G/Y channel corresponding to the downsample filters pipeline delay to make sure
the Y channel is in phase with the Cb and Cr channels.
Four different filters, from simple cut to ITU-R BT.601 compliant digital, can be selected
using the I
The range control function truncates the range of data to remove super-white and
super-black pixels at specified ceiling and floor values.
The error dispersal rounding (dithering) function can convert the color depth from 30-bit or
36-bit to reduced 30-bit or 24-bit color depth. When dithering is triggered, the TDA19978B
applies round, truncate or noise-shaping algorithms.
When the error dispersal rounding function is not used, the data coming from the filter is
directly sent to the 4:2:2 formatter. The error dispersal rounding function works only with
the active video signal.
UB
YG
VR
=
C
C
C
2
11
21
31
C-bus.
C
C
C
12
22
32
C
C
C
13
23
33
Rev. 01 — 7 August 2008
2
C-bus.
BU
CY
RV
+
O11
O12
O13
Quad HDMI 1.3a receiver with digital processing
+
OO1
OO2
OO3
MCLK period.
TDA19978B
© NXP B.V. 2008. All rights reserved.
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