TAS5754M 192kHz Processing Using Optical Input

Kato-san,

The PPCMB optical input doesn't support 192kHz. This will have to be done via the EXT I2S jumpers. In order to the use the EXT I2S as input to the TAS5754M EVM the PPCMB needs to be modified a shown below. Depopulate resistors R326 and  R327.

Kato-san,

Please see shematic modification in red (disconnections) and blue (connections).

Kato-san,

The command to use the IO expander to control the MCLK_MUX_CTRL signal that allows to switch between EXT PSIA MCLK signal and AIC3262 as the MCLK source is given below. The command below can be executed in the "Commad Buffer Interface" field of the "Direct I2C Read/Write" GUI tab.

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# AIC3262 as MCLK/I2S source

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# Change to GPIO mode

i gpio

# Set bank 0

w 99 04 01

# Set bits (command 01) with mask 08   - sets P1.5 of Bank 0

w 99 00 20

# Go back to I2C mode

i i2cfast

# Set pins 21-24 as outputs

w 44 0E 0F

# Set pin 23 low (MCLK-MUX = AIC3262)

w 44 06 3F

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# PSIA as MCLK/I2S source

################################################################

# Change to GPIO mode

i gpio

# Set bank 0

w 99 04 01

# Clear bits (command 01) with mask 20   - clears P1.5 of Bank 0

w 99 01 20

# Go back to I2C mode

i i2cfast

# Set pins 21-24 as outputs

w 44 0E 0F

# Set pin 23 high (MCLK-MUX = PSIA)

w 44 06 7F