CS4298 datasheet(16/52 Pages) CIRRUS

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CS4298

DS315PP2

5. AC ‘97

5.1

AC ‘97 Frame Definition

The AC Link is a bi-directional serial port with thirteen time-division multiplexed slots in each di-

rection. The first slot is 16 bits long and termed the tag slot. Bits in the tag slot determine if the Codec

is ready and indicate which, if any, other slots contain valid data. Slots 1 through 11 are 20-bits long

and can contain audio data. Slot 12 contains data to be written and read from GPIO. The serial data

line is defined from the Controller’s perspective, NOT from the Audio Codec’s perspective.

5.2

AC-Link Serial Data Output Frame

In the serial data output frame, data is passed on the SDATA_OUT pin TO the CS4298 FROM the

Controller. Figure 9 illustrates the serial port timing.

20.8

µS

(48 kHz)

Tag Phase

Data Phase

12.288 MHz

81.4 nS

SYNC

BIT_CLK

SDATA_OUT

SDATA_IN

F16

F15

F14

F13

F12

F35

F56

F76

F255

Valid

Frame

Slot 1

Valid

SCRA1 SCRA0

R/W

WD15

F36

F57

LP19

LP18

RP19

LC17

LC16

RC17

RD15

Bit Frame Position:

F16

F15

F14

F13

F12

F35

F56

F76

F255

F36

F57

F255

F97

Slot 0

Slot 1

Slot 2

Slot 3

Slot 4

Slots 5-12

Slot 2

Valid

Slot 1

Valid

Slot 2

Valid

Codec

Ready

Bit Frame Position:

Figure 9. AC-link Input and Output Framing

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