Texas Instruments PCM186xEVM, User Manual, Page: 8 / 21

Vin1
PCM186x
(Master)
Vin2
Vin3 Vin4
(Slave)
PCM9211
USB-I2X USB
I2C
SPDIF
Opto Out
XO
SCKI
BCK
BCK
LRCK
LRCK
D
out
D
in
Opto In
SPDIF
Vin1
PCM186x
(Slave)
Vin2 Vin3 Vin4
(Master)
PCM9211
USB-I2X USB
I2C
SPDIF
Opto Out
SCKI
SCKO
BCK
BCK
LRCK
LRCK
D
in
D
out
D
out
D
in
Hardware
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4.3 Board Configurations
Mode 0 is the default mode after power up ( Figure 6 ). In mode 0, the master clock is supplied from the
PCM9211 and the PCM186x is the slave. Optical inputs are routed to the PCM186x I2S inputs. The
optical input also sets the sample rate of the system to match the optical rate. If no input is provided, the
sample rate is generated by the PCM9211 and is 48 kHz. The I2X board provides I2C control and power
only. In mode 0, Y0 can be removed and jumpers should be placed on J8 and J11.
Figure 6. Mode 0 Block Diagram
In Mode 1 , the PCM186x is the master ( Figure 7 ). Clocking is provided by Y0. I2S is sent to the optical
output. The optical input is not available in this mode. The I2X board will provide I2C control and power
only. In mode 1, install Y0 and J10.
Figure 7. Mode 1 Block Diagram
8 PCM186xEVM SLAU615 – December 2014
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