DS90UA102-Q1 Datasheet, PDF (32/46 Pages) Texas Instruments – DS90UA102-Q1 Multi-Channel Digital Audio Link

DS90UA102-Q1
SNLS442A – JULY 2013 – REVISED SEPTEMBER 2013
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Multiple Device Addressing
Some applications require multiple devices with the same fixed address to be accessed on the same I²C bus.
The DS90UA101-Q1/DS90UA102-Q1 provides slave ID aliasing to generate different target slave addresses
when connecting two or more identical devices remotely. Instead of addressing their actual I²C addresses, each
remote device can be addressed through a unique alias ID by programming the Slave Alias ID register on the
Serializer/Deserializer. By addressing the Slave Alias IDs, I²C slaves with identical, fixed addresses can now be
addressed independently. On the DS90UA101-Q1, up to 1 Slave Alias ID index is supported. On the
DS90UA102-Q1, up to 8 Slave Alias IDs can be supported. The Audio Module/DSP (I²C Master) must keep track
of the alias list in order to properly address the correct device.
Refer to Figure 24 for an example of this function:
• There is a local I²C bus between Audio Module, DES A, and DES B. Audio Module is the I²C Master, and
DES A and DES B are I²C slaves.
• The I²C protocol is bridged from DES A to SER A and from DES B to SER B. SER A is the master of its own
local I²C bus, and Source A and its µC/EEPROM are slaves on this bus. SER B is also the master of its local
I²C bus, and Source B and its µC/EEPROM are the slaves.
• Audio Module can now address remote slaves connected to SER A and SER B independently.
• Case 1: If Audio Module transmits to I²C slave 0xA0, DES A (address 0xC0) will forward the transaction to
SER A, which then forwards it to remote slave Source A. Responses from Source A will travel from Source A
--> SER A --> DES A --> Audio Module.
• Case 2: If Audio Module transmits to slave address 0xA4, DES B (address 0xC2) will recognize that 0xA4 is
mapped to 0xA0 and will transmit the command to SER B, which then forwards it to remote slave Source B.
Responses from Source B will travel from Source B --> SER B --> DES B --> Audio Module.
• Case 3: If Audio Module sends command to address 0xA6, DES B (address 0xC2) will forward the
transaction to SER B, which then forwards it to Source B's µC/EEPROM. Responses from Source B's
µC/EEPROM will travel from Source B's µC/EEPROM --> SER B --> DES B --> Audio Module.
Source A
Slave ID: (0xA0)
Serializer A
Deserializer A
Digital
Audio
Source
DIN[7:0],
BCK, LRCK,
SCK
DOUT[7:0],
BCK, LRCK,
SCK
SDA
SCL
I²C
2C/
EEPROM
Slave ID: (0xA2)
Source B
Slave ID: (0xA0)
SER A: ID[x] (0xB0)
Serializer B
Digital
Audio
Source
DIN[7:0],
BCK, LRCK,
SCK
I²C
SDA
SCL
DES A: ID[x] (0xC0)
SLAVE ID0 (0xA0)
SLAVE ALIAS ID0 (0xA0)
SLAVE ID1 (0xA2)
SLAVE ALIAS ID1 (0xA2)
Deserializer B
DOUT[7:0],
BCK, LRCK,
SCK
Audio
Module
2C/
EEPROM
Slave ID: (0xA2)
SDA
SCL
I²C
SER B: ID[x] (0xB2)
I²C
SDA
SCL
DES B: ID[x] (0xC2)
SLAVE ID0 (0xA0)
SLAVE ALIAS ID0 (0xA4)
SLAVE ID1 (0xA2)
SLAVE ALIAS ID1 (0xA6)
Figure 24. Multiple Device Addressing
DSP
Master
32
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