GS1671 datasheet(53/130 Pages) SEMTECH

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GS1671 HD/SD SDI Integrated Receiver

Data Sheet

53737 - 2

September 2012

53 of 130

Error conditions are indicated by a VIDEO _ERROR signal and an AUDIO_ERROR signal,

which are available for output on the multifunction I/O output pins. The two signals are

also combined into a summary DATA_ERROR signal, which is also available on the

multifunction I/O pins. These signals are normally HIGH, but are set LOW by the device

when an error condition has been detected.

These signals are a logical 'NOR' of the appropriate error status flags stored in the

ERROR_STAT_X register, which are gated by the bit settings in the ERROR_MASK

registers. When an error status bit is HIGH and the corresponding error mask bit is LOW,

the corresponding DATA_ERROR signal is set LOW by the device.

The ERROR_STAT_X registers, and correspondingly the DATA_ERROR, VIDEO_ERROR,

and AUDIO_ERROR signals, are cleared at the start of the next video field or when read

via the host interface, which ever condition occurs first. Note that any AUDIO_ERROR

condition will cause DATA_ERROR to assert. Use the SD_AUDIO_ERROR_MASK and

HD_AUDIO_ERROR_MASK registers if masking these events is desired.

All bits of the ERROR_STAT_X registers are also cleared under any of the following

conditions:

1. LOCKED signal = LOW.

2. SMPTE_BYPASS = LOW.

3. When a change in video standard has been detected.

4. RESET_TRST = LOW

Table 4-13 shows the ERROR_STAT_X register and ERROR_MASK_X register.

NOTE: Since the error indication registers are cleared once per field, if an external host

micro is polling the error registers periodically, an error flag may be missed if it is

intermittent, and the polling frequency is less than the field rate.

NOTE: See Section 4.18 for Audio Error Status.

Table 4-13: Error Status Register and Error Mask Register

Video Error Status Register

Video Error Mask Register

SAV_ERR (02h, 03h)

SAV_ERR_MASK (037h, 038h)

EAV_ERR (02h, 03h)

EAV_ERR_MASK (037h, 038h)

YCRC_ERR (02h, 03h)

YCRC_ERR_MASK (037h, 038h)

CCRC_ERR (02h, 03h)

CCRC_ERR_MASK (037h, 038h)

LNUM_ERR (02h, 03h)

LNUM_ERR_MASK (037h, 038h)

YCS_ERR (02h, 03h)

YCS_ERR_MASK (037h, 038h)

CCS_ERR (02h, 03h)

CCS_ERR_MASK (037h, 038h)

AP_CRC_ERR (02h)

AP_CRC_ERR_MASK (037h)

FF_CRC_ERR (02h)

FF_CRC_ERR_MASK (037h)

VD_STD_ERR (02h, 03h)

VD_STD_ERR_MASK (037h)

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