DS90UB924-Q1 Datasheet, PDF (24/62 Pages) Texas Instruments – 5-MHz to 96-MHz 24-bit Color FPD-Link III to OpenLDI Deserializer With Bidirectional Control Channel

DS90UB924-Q1
SNLS512 – APRIL 2016
Table 3. GPIO_REG and GPIO Local Enable and Configuration (continued)
DESCRIPTION
GPIO3
GPIO2
GPIO1
GPIO0
REGISTER CONFIGURATION
0x1F = 0x01
0x1F = 0x09
0x1F = 0x03
0x1E = 0x01
0x1E = 0x09
0x1E = 0x03
0x1E = 0x01
0x1E = 0x09
0x1E = 0x03
0x1D = 0x01
0x1D = 0x09
0x1D = 0x03
FUNCTION
Output, L
Output, H
Input, Read: 0x6E[3]
Output, L
Output, H
Input, Read: 0x6E[2]
Output, L
Output, H
Input, Read: 0x6E[1]
Output, L
Output, H
Input, Read: 0x6E[0]
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7.3.15 I2S Audio Interface
The DS90UB924-Q1 deserializer features six I2S output pins that, when paired with a DS90UB927Q-Q1
serializer, supports surround-sound audio applications. The bit clock (I2S_CLK) supports frequencies between 1
MHz and the smaller of < PCLK/4 or < 13 MHz. Four I2S data outputs carry two channels of I2S-formatted digital
audio each, with each channel delineated by the word select (I2C_WC) input. The I2S audio interface is not
available in Backwards Compatibility Mode (BKWD = 1).
Deserializer
MCLK
I2S_CLK
I2S_WC
I2S_Dx
System Clock
Bit Clock
Word Select 4
Data
I2S Receiver
Figure 22. I2S Connection Diagram
I2S_WC
I2S_CLK
I2S_Dx
MSB
LSB MSB
LSB
Figure 23. I2S Frame Timing Diagram
When paired with a DS90UB921-Q1 or DS90UB925Q-Q1, the DS90UB924-Q1 I2S interface supports a single
I2S data output through I2S_DA (24-bit video mode), or two I2S data outputs through I2S_DA and I2S_DB (18-
bit video mode).
7.3.15.1 I2S Transport Modes
By default, packetized audio is received during video blanking periods in dedicated data island transport frames.
The transport mode is set in the serializer and auto-loaded into the deserializer by default. The audio
configuration may be disabled from control registers if Forward Channel Frame Transport of I2S data is desired.
In frame transport, only I2S_DA is received to the DS90UB924-Q1 deserializer. Surround Sound Mode, which
transmits all four I2S data inputs (I2S_D[D:A]), may only be operated in Data Island Transport mode. This mode
is only available when connected to a DS90UB927Q-Q1 serializer. If connected to a DS90UB921-Q1 or
DS90UB925Q-Q1 serializer, only I2S_DA and I2S_DB may be received.
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