Cirrus Logic CS4349 - Manual (Page 20)

20 DS782F2
CS4349
4.3.1 Time-Division Multiplex (TDM) Mode
Four TDM interface modes are available that allow the CS4349 to input stereo PCM data in one of four
time “slots”.
Figure 14 shows the serial port connections necessary to input eight-channel TDM data into
four CS4349 devices and the corresponding DIF[2:0] pin or register-bit settings required for each CS4349.
Figure 15 shows the TDM data format for each of the four CS4349 devices shown in Figure 14 .
Note: The group delay for TDM slot 0 channel B differs from the group delay of all other interface for-
mats 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.
.
Figure 14. TDM Mode Connection Diagram
LRCK
SCLK
SDIN
ILRCK
ISCLK
SDIN
LRCK
SCLK
SDIN
LRCK SCLK TDM_OUT
TDM Source
LRCK
SCLK
SDIN
DIF[2:0] = 100 DIF[2:0] = 101 DIF[2:0] = 110 DIF[2:0] = 111
CS4349
4
CS4349
1
CS4349
3
CS4349
2
Slot 1, ch B
LRCK
SCLK
MSB MSB MSB MSB MSB SDIN1
Slot 3, ch A Slot 3, ch B Slot 1, ch A Slot 0, ch A
256 clks
32 clks 32 clks 32 clks 32 clks 32 clks
MSB
Slot 2, ch A
32 clks
MSB
Slot 0, ch B
32 clks
MSB
Slot 2, ch B
32 clks
LSB MSB zero
Data
Figure 15. TDM Mode Timing