CS8412 datasheet(26/38 Pages) CIRRUS

26 / 38 page

CS8411 CS8412

DS61F1

C, U, VERF, ERF, and CBL Serial Outputs

The C and U bits and CBL are output one SCK pe-

riod prior to the active edge of FSYNC in all serial

port formats except 2, 3 and 9 (I2S modes). The ac-

tive edge of FSYNC may be used to latch C, U, and

CBL externally. In formats 2, 3 and 9, the C and U

bits and CBL are updated with the active edge of

FSYNC. The validity + error flag (VERF) and the

error flag (ERF) are always updated at the active

edge of FSYNC. This timing is illustrated in Figure

19.

The C output contains the channel status bits with

CBL rising indicating the start of a new channel

status block. CBL is high for the first four bytes of

channel status (32 frames or 64 samples) and low

for the last 20 bytes of channel status (160 frames

or 320 samples). The U output contains the User

Channel data. The Vbit is OR’ed with the ERF flag

and output on the VERF pin. This indicates that the

audio sample may be in error and can be used by in-

terpolation filters to interpolate through the error.

ERF being high indicates a serious error occurred

on the transmission line. There are three errors that

cause ERF to go high: a parity error or biphase

coding violation during that sample, or an out of

lock PLL receiver. Timing for the above pins is il-

lustrated in Figure 19.

Multifunction Pins

There are seven multifunction pins which contain

either error and received frequency information, or

channel status information, selectable by SEL.

No.

FSYNC (out)

SDATA (out)

13*

FSYNC (out)

SCK (out)

SDATA (out)

12*

MSB VU C P

LSB

AUX

MSB VU C P

LSB

AUX

Left

Right

Left

Right

MSB VU C P

LSB

AUX

MSB VU C P

LSB

AUX

SCK (out)

* Error flags are not accurate in these modes.

Figure 18. Special Audio Port Formats 12 and 13

CBL

SDATA

FSYNC

Left 0

Left 1

Right 0

Left 0

Left 32

Right 191

Right 31

Right 191

Ca-Ce

C0,

ERF,

VERF

C, U

Figure 19. CBL Timing

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