GS1670 datasheet(49/126 Pages) SEMTECH

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GS1670 HD/SD SDI Receiver

Data Sheet

53831 - 2

September 2012

49 of 126

The data format is determined using the following criteria:

• If TRS ID words are detected but no SDTI header or TDM header is detected, then

the data format is SDI

• If TRS ID words are detected and the SDTI header is available then the format is

SDTI

• If TRS ID words are detected and the TDM data header is detected then the format is

TDM video

• No TRS words are detected, but the PLL is locked, then the data format is unknown

NOTE: Two data format sets are provided for HD video rates. This is because the Y and

Cr/Cb channels can be used separately to carry SDTI data streams of different data

formats. In SD video mode, only the Y data format register contains the data, and the C

4.14 EDH Detection

4.14.1 EDH Packet Detection

The GS1670 determines if EDH packets are present in the incoming video data and

asserts the EDH_DETECT status according to the SMPTE standard.

EDH_DETECT is set HIGH when EDH packets have been detected and remains HIGH

until EDH packets are no longer present. It is set LOW at the end of the vertical blanking

(falling edge of V) if an EDH packet has not been detected during vertical blanking.

EDH_DETECT can be programmed to be output on the multi-function output port pins.

The EDH_DETECT bit is also available in the host interface.

Table 4-12:Data Format Register Codes

YDATA_FORMAT[3:0] or

CDATA_FORMAT[3:0]

Data Format

Remarks

0h ~ 05h

SDTI

SMPTE 321M, SMPTE 322M,

SMPTE 326M

SDI

−

Reserved

−

TDM

SMPTE 346M

HD-SDTI

−

Ah ~ Eh

Reserved

−

Non-SMPTE data

format

Detected data format is not SMPTE.

SMPTE_BYPASS = LOW

or LOCKED =

LOW

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