DS90UH927Q Datasheet, PDF (21/59 Pages) Texas Instruments – 5MHz - 85MHz 24-bit Color FPD-Link III Serializer with HDCP

DS90UH927Q
FIGURE 16. I2S Frame Timing Diagram
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When paired with a DS90UH926Q, the DS90UH927Q I2S interface supports a single I2S data input through I2S_DA (24-bit video
mode), or two I2S data inputs through I2S_DA and I2S_DB (18-bit video mode).
Table 3 covers several common I2S sample rates:
Sample Rate (kHz)
32
44.1
48
96
192
32
44.1
48
96
192
32
44.1
48
96
192
TABLE 3. Audio Interface Frequencies
I2S Data Word Size (bits)
16
16
16
16
16
24
24
24
24
24
32
32
32
32
32
I2S CLK (MHz)
1.024
1.411
1.536
3.072
6.144
1.536
2.117
2.304
4.608
9.216
2.048
2.822
3.072
6.144
12.288
I2S TRANSPORT MODES
By default, audio is packetized and transmitted during video blanking periods in dedicated Data Island Transport frames. Data
Island frames may be disabled from control registers if Forward Channel Frame Transport of I2S data is desired. In this mode, only
I2S_DA is transmitted to the DS90UH928Q deserializer. If connected to a DS90UH926Q deserializer, I2S_DA and I2S_DB are
transmitted. Surround Sound Mode, which transmits all four I2S data inputs (I2S_D[A..D]), may only be operated in Data Island
Transport mode. This mode is only available when connected to a DS90UH928Q deserializer.
I2S REPEATER
I2S audio may be fanned-out and propagated in the repeater application. By default, data is propagated via Data Island Transport
on the FPD-Link interface during the video blanking periods. If frame transport is desired, then the I2S pins should be connected
from the deserializer to all serializers. Activating surround sound at the top-level deserializer automatically configures downstream
DS90UH927Q serializers and DS90UH928Q deserializers for surround sound transport utilizing Data Island Transport. If 4-channel
operation utilizing I2S_DA and I2S_DB only is desired, this mode must be explicitly set in each serializer and deserializer control
register throughout the repeater tree (Table 5).
A DS90UH927Q serializer configured in repeater mode may also regenerate I2S audio from its I2S input pins in lieu of Data Island
frames. See the HDCP Repeater Connection Diagram (Figure 19) and the I2C Control Registers (Table 5) for additional details.
Copyright © 1999-2012, Texas Instruments Incorporated
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