www.ti.com

ERRORS AND ERROR PROCESSING

Error Output Description

ERROR Output

DIR9001

DetectedParityError

DataError

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