DS90UH940-Q1 Datasheet, PDF (34/87 Pages) Texas Instruments – FPD-Link III to CSI-2 Deserializer

DS90UH940-Q1
SNLS478A – NOVEMBER 2014 – REVISED JANUARY 2016
Sample Rate
(kHz)
32
44.1
48
96
192
32
44.1
48
96
192
Table 7. Audio Interface Frequencies (continued)
I2S Data Word Size (bits) I2S_CLK (MHz)
1.536
2.117
24
2.304
4.608
9.216
2.048
2.8224
32
3.072
6.144
12.288
MCLK Output (MHz)
I2S_CLK x1
I2S_CLK x2
I2S_CLK x4
I2S_CLK x1
I2S_CLK x2
I2S_CLK x4
I2S_CLK x1
I2S_CLK x2
I2S_CLK x4
I2S_CLK x1
I2S_CLK x2
I2S_CLK x4
I2S_CLK x1
I2S_CLK x2
I2S_CLK x4
I2S_CLK x1
I2S_CLK x2
I2S_CLK x4
I2S_CLK x1
I2S_CLK x2
I2S_CLK x4
I2S_CLK x1
I2S_CLK x2
I2S_CLK x4
I2S_CLK x1
I2S_CLK x2
I2S_CLK x4
I2S_CLK x1
I2S_CLK x2
I2S_CLK x4
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Register 0x3A[6:4]
000
001
010
001
010
011
001
010
011
010
011
100
011
100
101
001
010
011
001
010
011
001
010
011
010
011
100
011
100
110
8.3.13 HDCP
The HDCP Cipher function is implemented in the deserializer per HDCP v1.4 specification. The DS90UH940-Q1
provides HDCP decryption of audiovisual content when connected to an HDCP capable FPD-Link III serializer.
HDCP authentication and shared key generation is performed using the HDCP Control Channel, which is
embedded in the forward and backward channels of the serial link. On-chip Non-Volatile Memory (NVM) is used
to store the HDCP keys. The confidential HDCP keys are loaded by TI during the manufacturing process and are
not accessible external to the device.
8.3.13.1 HDCP I2S Audio Encryption
Depending on the quality and specifications of the audiovisual source, HDCP encryption of digital audio may be
required. When HDCP is active, packetized Data Island Transport audio is also encrypted along with the video
data per HDCP v1.4. I2S audio transmitted in Forward Channel Frame Transport mode is not encrypted. System
designers should consult the specific HDCP specifications to determine if encryption of digital audio is required
by the specific application audiovisual source.
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