CS8420 datasheet(67/80 Pages) CIRRUS

67 / 80 page

CS8420

DS245PP2

14.7

Hardware Mode 6 Description

(AES3 Transmitter Only)

Hardware Mode 6 data flow is shown in Figure 31.

Audio data is input via the serial audio input port

and routed to the AES3 transmitter.

The transmitted channel status, user and validity

data may be input in 2 alternative methods, deter-

mined by the state of the CEN pin. Mode 6A is se-

lected when the CEN pin is low. In mode 6A, the

user data and validity bit are input via the U and V

pins, clocked by both edges of ILRCK. The chan-

nel status data is derived from the state of the

COPY/C, ORIG, EMPH, and AUDIO pins. Table

13 shows how the COPY/C and ORIG pins map to

channel status bits. In consumer mode, the trans-

mitted category code shall be set to Sample Rate

Converter (0101100).

Mode 6B is selected when the CEN pin is high. In

mode 6B, the channel status, user data and validity

bit are input serially via the COPY/C, U and V pins.

These pins are clocked by both edges of ILRCK (if

the port is in master mode). Figure 22 shows the

timing requirements.

The channel status block pin (TCBL) may be an in-

put or an output, determined by the state of the

TCBLD pin. The serial audio input port data format

is selected as shown in Table 14, and may be set to

master or slave by the state of the APMS input pin.

The following pages contain the detailed pin de-

scriptions for hardware mode 6.

AES3

Encoder

&Tx

Serial

Audio

Input

C, U, V Data Buffer

ILRCK

ISCLK

TXP

COPY/C ORIG EMPH AUDIO TCBL

DFC0

DFC1

S/AES

VD+

H/S

Output

Clock

Source

OMCK

Power supply pins (VD+, VA+, DGND, AGND) & the reset pin (RST)

are omitted from this diagram. Please refer to the Typical Connection Diagram for hook-up details.

VD+

SDIN

SFMT1 SFMT0

VD+

FILT

TXN

CEN

VD+

TCBLD

APMS

Figure 31. Hardware Mode 6 - AES3 Transmitter Only

COPY/C ORIG

Function

PRO=0, COPY=0, L=0

PRO=0, COPY=0, L=1

PRO=0, COPY=1, L=0

PRO=1

Table 13. HW 6C COPY/C and ORIG pin function

SFMT1 SFMT0

Function

Serial Input Format IF1

Serial Input Format IF2

Serial Input Format IF3

Serial Input Format IF4

Table 14. HW 6 Serial Audio Port Format Selection

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