Preliminary
S3C2451X RISC MICROPROCESSOR
IIS-BUS INTERFACE
25-
17
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
IIS MODE REGISTER (IISMOD)
Register Address
Description
Reset
Value
IISMOD
0x55000104
IIS interface mode register
0x0000_0000
IISMOD Bit
R/W
Description
[31:15]
R/W
Reserved. Program to zero.
BLC [14:13]
R/W
Bit Length Control Bit Which decides transmission of 8/16 bits per
audio channel
00
:16 Bits per channel
01
:8 Bits Per Channel
10
:24 Bits Per Channel
11
:Reserved
CDCLKCON [12] R/W
Determine direction of codec clock(I2SCDCLK)
0 : Supply codec clock to external codec chip.
(from PCLK, EPLL, EPLLRefCLK)
1 : Get codec clock from external codec chip.
(to CLKAUDIO)
(Refer to Figure 25-2)
IMS
[11:10]
R/W
IIS master or slave mode select. (and select source of codec clock)
00: Master mode
(PCLK is source clock for I2SSCLK, I2SLRCLK, I2SCDCLK)
01: Master mode
(CLKAUDIO is source clock for I2SSCLK, I2SLRCLK.
CLKAUDIO-EPLL, EPLLRefCLK is source clock for I2SCDCLK)
10: Slave mode
(PCLK is source clock for I2SCDCLK)
11: Slave mode
(CLKAUDIO-EPLL, EPLLRefCLK is source clock for I2SCDCLK)
(Refer to Figure 25-2)
TXR [9:8]
R/W
Transmit or receive mode select.
00: Transmit only mode
01: Receive only mode
10: Transmit and receive simultaneous mode
11: Reserved
LRP [7]
R/W
Left/Right channel clock polarity select.
0: Low for left channel and high for right channel
1: High for left channel and low for right channel
SDF [6:5]
R/W
Serial data format.
00: IIS format
01: MSB-justified (left-justified) format
10: LSB-justified (right-justified) format
11: Reserved
RFS [4:3]
R/W
IIS root clock (codec clock) frequency select.
00: 256 fs, where fs is sampling frequency