LC89057W-VF4A-E Datasheet, PDF (12/59 Pages) Sanyo Semicon Device – Digital Audio Interface Transceiver

LC89057W-VF4A-E
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9.3 Demodulation Function Master/Slave Settings (CKST/PB)
• A master/slave function that allows multi-channel synchronized transfer using multiple LC89057W-VF4A-E ICs is
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included. For this setting, connects either a 10kΩ pull-down or a pull-up resistor to CKST/PB.
• _{Set to the master mode normally, when single LC89057W-VF4A-E IC is used. When multiple LC89057W-VF4A-E}
ICs are used, set one of them to the master mode and the others to the slave mode.
• _{In the multi-channel synchronous transfer mode using multiple LC89057W-VF4A-E ICs, connect RBCK and RLRCK}
(output) on the master side to RBCK and RLRCK (input) on the slave side. Also connect XMCK on the master side to
XIN on the slave side. At this time, the polarity of RBCK and RLRCK, and the frequency of XIN and XMCK must be
identical.
• _{If the input data sampling frequency or the phase are different between the master mode and slave mode or if the clock}
sources differ while the sampling frequencies are not different, some of the output data may get dropped or read twice
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on the slave side. You can see if these are happening by INT and the microcontroller interface.
Table 9.3 Master/Slave Switching (Register Connection)
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CKST/PB
Mode
Pull-down
Master
Pull-up
Slave
Pin
RMCK
RBCK
RLRCK
Table 9.4 Clock Pin State
Master mode
Output
Output
Output
Slave mode
Output
Input
Input
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9.4 Switching between Modulation Function and General-Purpose I/O Port (INT)
• _{The modulation function and the general-purpose I/O function share same pins. Therefore, these two functions cannot}
be used simultaneously.
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• _{To switch functions, connect either a 10kΩ pull-down or pull-up resistor to INT pin.}
Table 9.5 Switching between Modulation Function and General-Purpose I/O Port (Register Connection)
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INT State
Function
Pull-down
Modulation function
Pull-up
General-purpose I/O
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