Datasheet

ADAU1701 Data Sheet
Rev. C | Page 40 of 52
2078 (0x081E)—SERIAL OUTPUT CONTROL REGISTER
Table 47. Serial Output Control Register Bit Map
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
0
0
OLRP
OBP
M/S
OBF1
OBF0
OLF1
OLF0
FST
TDM
MSB2
MSB1
MSB0
OWL1
OWL0
0x0000
Table 48.
Bit Name Description
OLRP OUTPUT_LRCLK Polarity. When this bit is set to 0, the left-channel data is clocked when OUTPUT_LRCLK is
low and the right-channel data is clocked when OUTPUT_LRCLK is high. When this bit is set to 1, the right-
channel data is clocked when OUTPUT_LRCLK is low and the left-channel data is clocked when
OUTPUT_LRCLK is high.
OBP OUTPUT_BCLK Polarity. This bit controls on which edge of the bit clock the output data is clocked. Data
changes on the falling edge of OUTPUT_BCLK when this bit is set to 0 and on the rising edge when this bit is
set to 1.
M/S Master/Slave. This bit sets whether the output port is a clock master or slave. The default setting is slave; on
power-up, the OUTPUT_BCLK and OUTPUT_LRCLK pins are set as inputs until this bit is set to 1, at which time
they become clock outputs.
OBF[1:0] OUTPUT_BCLK Frequency (Master Mode Only). When the output port is being used as a clock master, these
bits set the frequency of the output bit clock, which is divided down from an internal 1024 × f
S
clock
(49.152 MHz for a f
S
of 48 kHz).
OBF[1:0] Setting
00 Internal clock/16
01
Internal clock/8
10 Internal clock/4
11 Internal clock/2
OLF[1:0]
OUTPUT_LRCLK Frequency (Master Mode Only). When the output port is used as a clock master, these bits set
the frequency of the output word clock on the OUTPUT_LRCLK pins, which is divided down from an internal
1024 × f
S
clock (49.152 MHz for a f
S
of 48 kHz).
OLF[1:0]
Setting
00 Internal clock/1024
01 Internal clock/512
10 Internal clock/256
11 Reserved
FST Frame Sync Type. This bit sets the type of signal on the OUTPUT_LRCLK pins. When this bit is set to 0, the
signal is a word clock with a 50% duty cycle; when this bit is set to 1, the signal is a pulse with a duration of
one bit clock at the beginning of the data frame.
TDM TDM Enable. Setting this bit to 1 changes the output port from four serial stereo outputs to a single
8-channel TDM output stream on the SDATA_OUT0 pin (MP6).
MSB[2:0] MSB Position. These three bits set the position of the MSB of data with respect to the LRCLK edge. The data
output of theADAU1701 is always MSB first.
MSB[2:0] Setting
000 Delay by 1
001 Delay by 0
010 Delay by 8
011 Delay by 12
100 Delay by 16
101 Reserved
111 Reserved
OWL[1:0] Output Word Length. These bits set the word length of the output data-word. All bits following the LSB are
set to 0.
OWL[1:0] Setting
00 24 bits
01 20 bits
10 16 bits
11 Reserved