5 stand-alone operation, 1 serial port format selection, 2 de-emphasis control – Cirrus Logic CS4350 User Manual
Page 23: 3 popguard transient control, 6 control port operation, 1 map auto increment, 2 i²c mode, 1 map auto increment 6.2 i²c mode, Section 5.1
DS691F2
23
CS4350
5 STAND-ALONE OPERATION
5.1
Serial Port Format Selection
The desired serial audio format is selected with the DIF2, DIF1 and DIF0 pins. For an explanation of the
required relationship between the LRCK, SCLK and SDIN, see
. For all formats, SDIN is valid
on the rising edge of SCLK. TDM Mode requires the selection of which stereo pair time “slot” is used to out-
put data as shown in
and
.
Note:
The group delay for TDM slot 0 channel B differs from the group delay of all other interface formats
and TDM slots/channels by one sample. Refer to the group delay specification in the combined in-
terpolation and on-chip analog filter response specifications table.
5.2
De-Emphasis Control
When pulled to VLC, the DEM pin activates the 44.1 kHz de-emphasis filter. When pulled to GND, the DEM
pin turns off the de-emphasis filter.
5.3
Popguard
Transient Control
In Stand-Alone Mode, Popguard is selected by placing a 47 k
resistor between RMCK and VLS. Popguard
is defeated in Stand-Alone Mode by placing a 47 k
resistor between RMCK and ground.
6 CONTROL PORT OPERATION
The control port is used to load all the internal register settings (see
”Register Description” on page 28
). The oper-
ation of the control port may be completely asynchronous with the audio sample rate. However, to avoid potential
interference problems, the control port pins should remain static if no operation is required.
The control port can operate in I²C or SPI mode.
6.1
MAP Auto Increment
The device has a MAP (memory address pointer) auto-increment capability enabled by the INCR bit (also
the MSB) of the MAP. If INCR is set to 0, MAP will stay constant for consecutive writes or reads. If INCR is
set to 1, MAP will auto increment after each byte is read or written, allowing block reads or writes of con-
secutive registers.
6.2
I²C Mode
In the I²C Mode, data is clocked into and out of the bi-directional serial control data line, SDA, by the serial
control port clock, SCL (see
for the clock to data relationship). There is no CS pin. AD1 and AD0
DIF2 DIF1 DIF0
DESCRIPTION
FORMAT FIGURE
0
0
0
Left-Justified, up to 24-bit data
0
0
0
1
I²S, up to 24-bit data
1
0
1
0
Right-Justified, 16-bit data
2
0
1
1
Right-Justified, 24-bit data
3
1
0
0
TDM slot 0
4
1
0
1
TDM slot 1
5
1
1
0
TDM slot 2
6
1
1
1
TDM slot 3
7
Table 12. Digital Interface Format - Stand-Alone Mode