Datasheet

www.ti.com
ERRORS AND ERROR PROCESSING
Error Output Description
ERROR Output
DIR9001
DetectedParityError
DataError
Parity Error Processing
DIR9001
SLES198 – DECEMBER 2006
Error detection and data error processing for PLL errors
• PLL responds with unlock for data in which the rule of biphase encoding is lost (biphase error and
frame-length error).
• PLL responds with unlock for data in which the preamble B, M, W can not be detected.
Error processing function and error output pins
• The DIR9001 has a data error detect function and an error output pin, ERROR.
• The ERROR pin is defined as the logical OR of data error and parity error detection.
• The ERROR rising edge is synchronized with CLKST.
• The ERROR falling edge is synchronized with LRCK.
The relationship between data error and detected parity error is shown in Figure 15 .
Figure 15. ERROR Output
The state of the ERROR pin and the details of error are shown in Table 10 .
Table 10. State of ERROR Output Pin
ERROR DESCRIPTION
L Lock state of PLL and nondetection of parity error
H Unlock state of PLL or detection of parity error
Error detection and error processing for parity errors
• For PCM data, interpolation processing by previous data is performed.
• For non-PCM data, interpolation is not performed and data is directly output with no processing. (Non-PCM
data is data with channel-status data bit 1 = 1.)
The processing for parity error occurrence is shown in Figure 16 .
22
Submit Documentation Feedback