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Channel-Status Data and User Data Serial Outputs

UOUT

COUT

BFRAME

Recovered

LRCKO

(I S)

2

Recovered

LRCKO

(ExceptI S)

2

U0L

U0R

U191R

U1L

U1R

U2L

U2R

C0L

C0R

C191R

C1L

C1R

C2L

C2R

DOUT

0L

0R

191R

1L

1R

2L

2R

3L

17BCK

Channel-Status Data Information Output Terminal

DIR9001

SLES198 – DECEMBER 2006

The DIR9001 can output channel-status data and user data synchronized with audio data from the biphase input

signal.

Each output data has its own dedicated output pin.

• Channel-status data (C, hereinafter) is output through COUT pin.

• User data (U, hereinafter) is output through UOUT pin.

The C and U outputs are synchronized with LRCKO recovered from the biphase input signal.

The polarity of LRCKO recovered from the biphase input signal depends on FMT[1:0] setting.

For detecting the top of the block of channel-status data or user data, the BFRAME pin is provided.

The BFRAME pin outputs a high level for an 8-LRCK period if the preamble B is detected in the received

biphase signal.

In processing these data by a microcontroller or register circuit, LRCKO is used as the data input clock, and the

output pulse on the BFRAME pin is used as the top-of-block signal.

The relationship among LRCKO, BFRAME, DOUT, COUT, and UOUT is shown in Figure 13.

When in the XTI mode and the PLL-locked state, COUT and UOUT output L.

NOTE: The numbers 0 through 191 of DOUT, COUT, and UOUT indicate frame numbers of the biphase input.

Figure 13. LRCKO, DOUT, BFRAME, COUT, UOUT Output Timing

The DIR9001 can output part of the channel-status information (bit 1, bit 3) through two dedicated pins, AUDIO

and EMPH.

The channel-status information which can be output from dedicated pins is limited to information from the

L-channel.

If channel-status information other than AUDIO or EMPH is required, or information from the R-channel, then the

channel-status data on the COUT pin, which is synchronized with biphase input signal, can be used.

These outputs are synchronized with the top of block.

The information that can be output through the dedicated pins is shown as follows.

20

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