CS8401A-CS datasheet(23/34 Pages) ETC

23 / 34 page

C2 is tied high, channel status bit 2 will be trans-

mitted as a zero. Also, FC0 and FC1 are encoded

versions of channel status bits 24 and 25, which

define the sample frequency. When FC0 and FC1

are both high, the part is placed in a CD sub-

mode which activates the CD subcode port. This

submode is described in detail in the next sec-

tion. Table 5 describes the encoding of C24 and

C25 through the FC1 and FC0 pins. According

to AES/EBU standards, C2 is copy prohibit/per-

mit, C3 specifies pre-emphasis, C8 and C9

define the category code, and C15 identifies the

generation status of the transmitted material (i.e..

first generation, second generation).

Consumer - CD Submode

The consumer CD submode is invoked by plac-

ing the part in consumer mode (PRO = high) and

setting both FC1 and FC0 high. This mode rede-

fines some of the pins for a CD subcode port as

shown in Figure 21. The CD subcode port pins,

SBF and SBC, replace the C and CBL pins respec-

tively. The user data input, U, becomes the CD

subcode input. Figure 22 describes the timing for

the CD subcode port. When SBF is low, SBC be-

comes active, clocking in the subcode bits. SBF

goes high for one SCK period, one half SCK pe-

riod after the active edge of FSYNC for all formats

(except format 4, which will be one and a half

SCK periods after the active edge of FSYNC). SBF

high for more than 16 SBC periods indicates the

start of a subcode block. The first, third, and fourth

Q bits after the start of a subcode block become

channel status bits 5, 2, and 3 respectively. Chan-

nel status bits are set by the dedicated pins; the

category code is forced to CD.

Parity

Preamble

Timing

Mux

MCK

TXP

TXN

Serial

Port

Audio

Logic

FSYNC

SCK

SDATA

C Bits

Aux

Biphase

Mark

Encoder

Line

Driver

RST

CBL

FC1

FC0

PRO

C15

+5V

Registers

U Bits

Validity

Figure 20. CS8402A Block Diagram - Consumer Mode

Table 5. Sample Frequency Encoding

FC1

FC0

C24

C25

Comments

44.1 kHz

48.0 kHz

32.0 kHz

44.1 kHz, CD Mode

Table 4. Emphasis Encoding

EM1

EM0

CS8402A

DS60F1

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