S3C2416X RISC MICROPROCESSOR
IIS MULTI AUDIO INTERFACE
23-3
5.1 MASTER/SLAVE MODE
Master or slave mode can be chosen by setting IMS bit of IISMOD register. In master mode, I2SSCLK and
I2SLRCLK are generated internally and supplied to external device. Therefore a root clock is needed for
generating I2SSCLK and I2SLRCLK by dividing. The IIS pre-scaler (clock divider) is employed for generating a
root clock with divided frequency from internal system clock(PCLK, divided EPLL clock , EPLLrefCLK) and
external I2S clock(from I2SCDCLK pad). The I2SSCLK and I2SLRCLK are supplied from the pin (GPIOs) in slave
mode.
Master/Slave mode is different with TX/RX. Master/Slave mode presents the direction of I2SLRCLK and
I2SSCLK. It doesn’t matter the direction of I2SCDCLK (This is only auxiliary.) At slave mode, I2SCDCLK can be
also going out for external IIS codec chip operation. If IIS bus interface transmits clock signals to IIS codec, IIS
bus is master mode. But if IIS bus interface receives clock signal from IIS codec, IIS bus is slave mode. TX/RX
mode indicates the direction of data flow. If IIS bus interface transmits data to IIS codec, this is TX mode.
Conversely, IIS bus interface receives data from IIS codec that is RX mode. Let’s distinguish Master/Slave mode
from TX/RX mode.
Figure 23-2 shows the route of the root clock with internal master(PCLK, divided EPLL clock , EPLLRefClock) or
external master(External I2S clock) mode setting in IIS clock control block and system controller. Note that RCLK
indicates root clock and this clock can be supplied to external IIS codec chip at internal master mode and slave
mode.(when CDCLKCON bit of IISMOD register is 1). At slave mode RCLK doesn’t affect to I2SSCLK and
I2SLRCLK, but for correct I2S functioning setting RFS, BFS are needed.
Figure 23-2. IIS Clock Control Block Diagram
Содержание S3C2416
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Страница 38: ...PRODUCT OVERVIEW S3C2416X RISC MICROPROCESSOR 1 10 153 AIN 1 U14 195 EINT 10 GPG2 K15 237 SDATA 14 C18 ...
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Страница 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
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Страница 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Страница 653: ...S3C2416X RISC MICROPROCESSOR ELECTRICAL DATA 26 15 Figure 26 14 SDRAM READ WRITE Timing Trp 2 Trcd 2 Tcl 2 DW 16 bit ...
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Страница 672: ...MECHANICAL DATA S3C2416X RISC MICROPROCESSOR 30 2 Figure 27 2 330 FBGA 1414 Package Dimension 2 Bottom View ...