PCM4108

SBAS354 − JUNE 2005

www.ti.com

23

Slot 1

Slot 2

Slot 3

Slot 4

Ch. 1

Ch. 2

Ch. 3

Ch. 4

In the case of BCK = 96f

In the case of BCK = 128f

The audio data is left justified in the time slot, with the the least significant 8 bits of each time slot being don’tcare bits.

Audio data is always presented in two’s complement, MSB−first format.

LRCK

Normal, Zero BCK Delay

LRCK

Normal, One BCK Delay

LRCK

Inverted, Zero BCK Delay

LRCK

Inverted, One BCK Delay

DATA0

DATA2

Ch. 5

Ch. 6

Ch. 7

Ch. 8

One Frame

BCK = 96f

(SUBA = SUBB = 0)

TDM Data Formats

− Quad Rate Sampling Mode

Figure 14. TDM Data Formats: Quad Rate Sampling Mode

LRCK

BCK

(BCKE = 0)

t

DS

t

DH

t

LRBKD

t

LRCKP

t

BNF

t

BKBF

One Frame

BCK

(BCKE = 1)

P ARAM E T E R

DE S CRIP T IO N

M IN

M A X

UNIT S

1/f

BCK

1/f

BCK

12

10

10

12

ns

ns

ns

ns

ns

ns

LRCK pulse width

LRCK active edge to BCK sampling edge delay

Data setup time

Data hold time

LRCK transition before new frame

BCK sampling edge to new frame delay

Audio Data

Figure 15. TDM Timing