CS4218 datasheet(25/44 Pages) CIRRUS

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SERIAL MODE 5 (SM5)

The Serial Mode 5 is compatible with the Phil-

lips I

2S serial protocol. SM5 is enabled by

setting SMODE3 = 0, SMODE2 = 0, and

SMODE1 = 1. This is a master mode fixed at

64 BPF.

Figure 21 shows the frame format of the SM5.

Figure 22 shows the detailed frame format.

The multi-function pins MF4, MF7, and MF8

are not used in this mode. MF4 should be tied

to VD, and MF7 and MF8 should be tied to

ground.

Figures 11 & 12 illustrate the serial data in,

SDIN, and serial data out, SDOUT, sub-frames

for SM5.

Sample Frequency Selection

The multifunction pins MF1:F1, MF2:F2, and

MF3:F3 are used to select the sample frequency

divider. Table 3 lists the decoding for the sample

frequency select pins where the sample fre-

quency selected is CLKIN/N. Also shown are the

sample frequencies obtained by using one of two

example master clocks. A change in sample rate

will automatically initiate a calibration cycle.

Word A

Word B

FRAME n

64 SCLK Periods

Word A

Word B

FRAME (n+1)

Word A

Word B

FRAME (n+2)

Word A

Word B

FRAME (n+3)

Word A

Word B

FRAME (n+4)

SSYNC

DATA

1 SCLK

Figure 21. Serial Mode 5

MSB

SCLK

SSYNC

MSB

32 CLOCKS

LSB

Word A

Word B

LSB

SDIN

SDOUT

LSB

FRAME

Figure 22. Detailed Serial Mode 5.

CS4218

DS135F1

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