CS8413 datasheet(21/38 Pages) ETC

21 / 38 page

CS8413 CS8414

DS240F1

Normal Modes (M3 = 0)

When M3 is low, the normal serial port formats

shown in Figure 17 are selected using M2, M1, and

M0. These formats are also listed in Table 3,

wherein the first word past the format number

(Out-In) indicates whether FSYNC and SCK are

outputs from the CS8414 or are inputs. The next

word (L/R-WSYNC) indicates whether FSYNC in-

dicates the particular channel or just delineates

each word. If an error occurs (ERF = 1) while using

one of these formats, the previous valid audio data

for that channel will be output. As long as ERF is

high, that same data word will be output. If the

CS8414 is not locked, it will output all zeroes. In

some modes FSYNC and SCK are outputs and in

others they are inputs. In Table 3, LSBJ is short for

LSB justified where the LSB is justified to the end

of the audio frame and the MSB varies with word

length. As outputs the CS8414 generates 32 SCK

periods per audio sample (64 per stereo sample)

and, as inputs, 32 SCK periods must be provided

per audio sample. When FSYNC and SCK are in-

puts, one stereo sample is double buffered. For

those modes which output 24 bits of audio data, the

auxiliary bits will be included. If the auxiliary bits

are not used for audio data, they must be masked

off.

Table 3. Normal Audio Port Modes (M3 = 0)

Special Modes (M3 = 1)

When M3 is high, the special audio modes de-

scribed in Table 4 are selected via M2, M1, and

M0. In formats 8, 9, and 10, SCK, FSYNC, and

SDATA are the same as in formats 0, 1, and 2 re-

spectively; however, the recovered data is output as

is even if ERF is high, indicating an error. (In

modes 0-2 the previous valid sample is output.)

Similarly, when out of lock, the CS8414 will still

output all the recovered data, which should be ze-

ros if there is no input to the RXP, RXN pins. For-

mat 11 is similar to format 0 except that SCK is an

input and FSYNC is an output. In this mode

FSYNC and SDATA are synchronized to the in-

coming SCK, and the number of SCK periods be-

tween FSYNC edges will vary since SCK is not

synchronous to received data stream. This mode

may be useful when writing data to storage.

Table 4. Special Audio Port Modes (M3 = 1)

Format 12 is similar to format 7 except that SDA-

TA is the entire data word received from the trans-

mission line including the C, U, V, and P bits, with

zeros in place of the preamble. In format 13 SDA-

TA contains the entire biphase encoded data from

the transmission line including the preamble, and

SCK is twice the normal frequency. The normal

two frame delay of data from input to output is re-

duced to only a few bit periods in formats 12 and

13. However, the C, U, V bits and error codes fol-

low their normal pathways and therefore follow the

output data by nearly two frames. Figure 18 illus-

trates formats 12 and 13. Format 14 is reserved and

not presently used, and format 15 causes the

CS8414 to go into a reset state. While in reset all

outputs will be inactive except MCK. The CS8414

comes out of reset at the first block boundary after

Format

0 - Out, L/R, 16-24 Bits

1 - In, L/R, 16-24 Bits

2 - Out, L/R, I2S Compatible

3 - In, L/R, I2S Compatible

4 - Out, WSYNC, 16-24 Bits

5 - Out, L/R, 16 Bits LSBJ

6 - Out, L/R, 18 Bits LSBJ

7 - Out, L/R, MSB Last

Format

8 - Format 0 - No repeat on error

9 - Format 1 - No repeat on error

10 - Format 2 - No repeat on error

11 - Format 0 - Async. SCK input

12 - Received NRZ Data

13 - Received Bi-phase Data

14 - Reserved

15 - CS8414 Reset

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