CS4218 Datasheet, PDF (21/44 Pages) Cirrus Logic – 16-Bit Stereo Audio Codec

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
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