CS4216 datasheet(20/58 Pages) CIRRUS

20 / 58 page

MF5:INT is reset by reading the control serial

port.

Master Sub-Mode (SM4)

Master sub-mode configures SSYNC and SCLK

as outputs from the CS4216. During power

down, SSYNC and SCLK are driven high im-

pedance, and during reset they both are driven

low. There are two SM4 Master sub-modes. One

allows 32 bits per frame and the other allows 64

bits per frame. As shown in Table 6, the

SMODE1 and SMODE2 pins select the particu-

lar Master sub-mode (as well as the Slave

sub-mode). When SMODE1 is set to zero,

SMODE2 selects either Master sub-mode with

32-bit frames, or Slave sub-mode.

SMODE1,SMODE2 = 00 selects Master sub-

mode where a frame = sub-frame = 32 bits. This

sub-mode allows only one codec on the audio

serial bus, with the first 16 bits being the left

channel and the second 16 bits being the right

channel. The Applications of SM4 section con-

tains

informat ion

low-co st

implementations of this sub-mode.

SMODE1 = 1 selects Master sub-mode with a

frame width of 64 bits. This sub-mode allows up

to two codecs to occupy the same bus. SMODE2

is now used to select the particular time slot. If

SMODE2 = 0 the codec selects time slot 1,

which is the first 32 bits. If SMODE2 = 1 the

codec selects time slot 2, which is the second

32 bits.

In Master sub-mode, multifunction pins MF6:F1,

MF7:F2, and MF8:F3 select the sample fre-

quency as shown in Table 7. This table indicates

how to obtain standard audio sample frequencies

g ive n one of two CLKIN frequencies:

12.288 MHz or 11.2896 MHz. Other CLKIN

frequencies may be used with the corresponding

sample frequencies being CLKIN/N. The codec

must be reset when changing sample frequencies

to allow a new calibration to occur.

Slave Sub-Mode (SM4)

In SM4, Slave sub-mode is selected by setting

SMODE1,SMODE2 = 01. This mode configures

SSYNC and SCLK as inputs to the CS4216.

These two signals must be externally derived

from CLKIN. Since the CS4216 has no control

over the phase relationship of SSYNC and

SMODE1

SMODE2

SM4, Sub-Mode

Master, 32 BPF

Slave, 128/64/32 BPF

Master, 64 BPF, TS1

Master, 64 BPF, TS2

Table 6. SM4 Sub-Modes.

SSYNC

SCLK

SDIN

SDOUT

Sub-Fram e

AD C - Left W ord

AD C - R ight W ord

ADC - Left W ord

ADC - Right W ord

DAC - Left W ord

DAC - Right W ord

DAC - Left W ord

DAC - Right W ord

(slave)

(m aster)

Figure 13. SM4-Audio Serial Port, 32 BPF

CS4216

DS83F2

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