CS4216 datasheet(19/58 Pages) CIRRUS

19 / 58 page

SERIAL MODE 4, SM4

S e ri a l

m o d e

i s

en ab led

b y

s ett in g

SMODE3 = 1. Both Master and Slave sub-

modes are available and are selected by setting

the SMODE2 and SMODE1 pins as shown in

Table 6. In Master sub-mode, the phase relation-

ship between SCLK/SSYNC and CLKIN is

controlled to minimize digital noise coupling

into the analog section. Therefore, Master sub-

mo de may yield sl ightly better noise

performance than Slave sub-mode. In Slave sub-

mode, SCLK and SSYNC must be synchronous

to the master clock.

In serial mode 4, SM4, the CLKIN frequency

must be 256 times the highest sample frequency

needed. Also, SM4 has five attenuation bits for

each D/A output channel. SM4 differs from SM3

in that SM4 splits the audio data from the con-

trol data with the control data input on an

independent serial port. This reduces the audio

serial bus bandwidth in half, providing an easier

interface to low-cost DSPs. The audio serial port

sub-frame is illustrated in Figure 13 for SM4.

Interrupt Pin - MF5:INT

Serial Mode 4 also defines the multifunction pin

MF5:INT as an open-collector interrupt pin. In

SM4, this pin requires a pullup resistor and will

go low when the ADV bit or DI1 pin change, or

a rising edge on the LCL or RCL bits, or by

exiting an SCLK out of range condition (Er-

ror = 3). The interrupt may be masked by setting

the MSK bit in the control serial data port.

Sub-frame 1

FRAME (n+1)

Word A

Word B

Sub-frame 1

Word A

Word B

FRAME n

64 SCLK Periods

FRAME (n+2)

Sub-frame 1

Word A

Word B

FRAME (n+3)

Sub-frame 1

Word A

Word B

SSYNC

DATA

SFS2

SFS1 frame

MF8:

MF7:

Sub-

Figure 10. SM3-Slave - 64 BPF; MF1:F1, MF2:F2 = 00

Sub-frame 1

Sub-frame 2

FRAME (n+1)

Word A

Word B

Word A

Word B

Sub-frame 1

Word A

Word B

FRAME n

128 SCLK Periods

Sub-frame 2

Word A

Word B

FRAME (n+2)

Sub-frame 1

Word A

Word B

SSYNC

DATA

SFS2

SFS1 frame

MF8:

MF7:

Sub-

Figure 11. SM3-Slave - 128 BPF; MF1:F1, MF2:F2 = 01

S u b-fra m e 1

S u b-fram e 2

S u b-fram e 3

S u b-fra m e 4

FR AM E (n+1)

Word A

W ord B

Wo rd A

W ord B

W ord A

W ord B

Word A

W ord B

FR A M E n

S ub-fra m e 1

W o rd A

W ord B

25 6 S C LK P erio ds

SSYN C

DA T A

S F S2

SF S 1 fram e

M F 8:

M F 7:

S u b-

Figure 12. SM3-Slave - 256 BPF; MF1:F1, MF2:F2 = 10

CS4216

DS83F2

CS4216 датащи(PDF) 19 Page - Cirrus Logic

CS4216 датащи(HTML) 19 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

датащи скачать

ссылки URL