CS4218 查看數據表（PDF） - Cirrus Logic

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CS4218

16-Bit Stereo Audio Codec

Cirrus Logic 

CS4218

ignored and the sample frequency is linearly

scaled with SCLK. (The CLKIN pin must be

tied low.) This mode also fixes SCLK at 256 bits

per frame with MF7:SFS1 and MF8:SFS2 select-

ing the particular sub-frame. This master

clocking option is not available in the multiplier

(SM3-MS) sub-mode.

Multiplier Sub-Modes (SM3-MM and

SM3-MS)

The SM3 Multiplier sub-modes are identical to

the SM3-M and SM3-S sub-modes with the fol-

lowing exceptions:

• Set SMODE1 = SMODE2 = SMODE3 = 0.

This selects SM3 Multiplier mode.

• CLKIN must be 16*Fs, as opposed to

256*Fs used for SM3-M and SM3-S.

• A 0.47uF capacitor must be connected to the

FILT pin as shown in Figure 8.

Master / Slave setup, frame formats, and sample

rate selection are identical to SM3-M and SM3-

S. Please note that the MF1:F1 = MF2:F2 = 1

slave configuration supported by the SM3-S sub-

mode it not available in SM3-MS sub-mode.

DATA

FRAME n

64 SCLK Periods

FRAME (n+1)

FRAME (n+2)

FRAME (n+3)

Sub-frame 1

Sub-frame 1

Sub-frame 1

Sub-frame 1

Word A Word B Word A Word B Word A Word B Word A Word B

SSYNC

Figure 16. SM3-S and SM3-MS - 64 BPF; MF1:F1, MF2:F2 = 00

MF8: MF7: Sub-

SFS2 SFS1 frame

0

01

DATA

SSYNC

FRAME n

128 SCLK Periods

FRAME (n+1)

FRAME (n+2)

Sub-frame 1

Sub-frame 2

Sub-frame 1

Sub-frame 2

Sub-frame 1

Word A Word B Word A Word B Word A Word B Word A Word B Word A Word B

MF8: MF7: Sub-

SFS2 SFS1 frame

0

01

0

12

Figure 17. SM3-S and SM3-MS - 128 BPF; MF1:F1, MF2:F2 = 01

DATA

FRAME n

256 SCLK Periods

FRAME (n+1)

Sub-frame 1

Sub-frame 2

Sub-frame 3

Word A Word B Word A Word B Word A Word B

Sub-frame 4

Sub-frame 1

Word A Word B Word A Word B

SSYNC

Figure 18. SM3-S and SM3-MS - 256 BPF; MF1:F1, MF2:F2 = 10

MF8: MF7: Sub-

SFS2 SFS1 frame

0

01

0

12

1

03

1

14

DS135F1

21

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