tda19977a NXP Semiconductors, tda19977a Datasheet - Page 14

• Manufacturer Part Number: tda19977a
• Description: Triple Input Hdmi 1.3a Compliant Receiver Interface With Equalizer Up To 1080p For Hdtv, And Uxga For Pc Formats
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA19977A_TDA19977B_1
Product data sheet
8.13 Sync timing measurement
8.14 Format measurement timing
8.15 Color space conversion
8.16 4:2:2 downsampling filters
8.17 Range control
8.18 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 TDA19977A; TDA19977B 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 TDA19977A; TDA19977B 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, programming of all coefficients and
offsets is done using 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
TDA19977A; TDA19977B 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
Triple input HDMI receiver interface with digital processing
C-bus.
BU
CY
RV
+
O11
O12
O13
TDA19977A; TDA19977B
+
OO1
OO2
OO3
MCLK period.
© NXP B.V. 2008. All rights reserved.
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