tda9984a NXP Semiconductors, tda9984a Datasheet - Page 23

• Manufacturer Part Number: tda9984a
• Description: Hdmi 1.3 Transmitter With 1080p Upscaler Embedded
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA9984A_4
Product data sheet
8.3.1.1 Repeater function
8.3.1.2 SHA-1
8.2.3 High bit rate audio
8.3.1 High-bandwidth digital content protection
8.4.1 RxSense detection
8.3 HDCP processing
8.4 TMDS serializer
If the input clock has a frequency of 32f
input clock has a frequency of 64f
truncated to 24-bit format and padded with zeros. If the input clock has a frequency of 64f
and is right justified, audio sample must be strictly 24-bit length.
The word select signal WS indicates whether left or right channel information is
transferred over the serial data.
The High Bit Rate audio format is used to support both DTS-HD and Dolby-True HD audio
format provided for instance by Blu-Ray DVD. The transmitter is capable to receive a
single High Bit Rate IEC 61937 stream at a frame rate of 768 kHz. This is typically
stripped across 4
clock rate of 192 kHz.
As for I
information are carried on the stream through the use of the channel status bit via the
I
The HDMI transmitter contains an HDCP function, which encrypts the transmitted stream
content (both video and audio). This function can be enabled and disabled via the I
The keys can be stored internally in OTP non-volatile memory or can be loaded via the
I
The TDA9984A can be used in a repeater device according to the HDCP specification,
Rev 1.2 . The TDA9984A is able to store the KSV list of a maximum of 127 devices in a
register memory.
To deal with repeater, a SHA-1 calculation is performed by the transmitter and by the
downstream repeater. For security purposes and in order to relieve the microcontroller,
the SHA-1 has been implemented within the TDA9984A.
This calculation is worked out after the transmitter has loaded the KSV list (see HDCP
specification, Rev 1.2 ). If SHA-1 calculated by transmitter equals the SHA-1 calculated by
repeater, then an interrupt is sent.
The TDA9984A has the capability to sense the receiver connectivity and working
behavior. This feature detects the presence of the 50
downstream side onto the TMDS clock channel.
2
2
C-bus table.
C-bus. As the keys are stored internally, the security is maximized.
2
S-bus, no additional information is required on the audio infoframe. All relevant
I
2
S-bus interface to the HDMI transmitter with a corresponding I
Rev. 04 — 15 January 2009
HDMI 1.3 transmitter with 1080p upscaler embedded
s
and is left justified or Philips, the audio word is
s
, only 16-bit audio samples can be received. If the
pull-up resistor R
TDA9984A
© NXP B.V. 2009. All rights reserved.
T
on the
2
2
23 of 40
C-bus.
S-bus
s