Cirrus-logic CS4350 Manuel d'utilisateur télécharger pdf (Page 19)

DS691F2 19

CS4350

4.3.1 Time-Division Multiplex (TDM) Mode

Four TDM interface modes are available that allow the CS4350 to input stereo PCM data in one of 4 time

“slots”. Figure 14 shows the serial port connections necessary to input 8-channel TDM data into four

CS4350 devices, and the corresponding DIF[2:0] pin or register-bit settings required for each CS4350.

Figure 15 shows the TDM data format for each of the four CS4350 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 com-

bined interpolation and on-chip analog filter response specifications table.

LRCK

SCLK

SDIN

ILRCK

ISCLK

SDIN

LRCK

SCLK

SDIN

LRCK SCLK TDM_OUT

TDM Source

CS4350

LRCK

SCLK

SDIN

CS4350

DIF[2:0] = 100 DIF[2:0] = 101 DIF[2:0] = 110 DIF[2:0] = 111

CS4350

Figure 14. TDM Mode Connection Diagram

Slot 1, ch B

LRCK

SCLK

MSB MSB MSB MSB MSB

SDIN1

Slot 3, ch A Slot 3, ch B

Slot 1, ch ASlot 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

LSBMSB

zero

Data

Figure 15. TDM Mode Timing

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 37 38

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Cirrus-logic CS4350 Manuel d'utilisateur Page 19

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