Datasheet
www.ti.com
Channel-Status Data and User Data Serial Outputs
UOUT
COUT
BFRAME
Recovered
LRCKO
(I S)
2
Recovered
LRCKO
(ExceptI S)
2
U0L U0RU191R
U1L
U1R U2L U2R
C0L C0RC191R C1L C1R C2L C2R
DOUT
0L 0R191R
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
Submit Documentation Feedback