GS1582-IBE3 View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

GS1582-IBE3

Multi-Rate Serializer with Cable Driver, Audio Multiplexer and ClockCleaner™

Semtech Corporation 

4.3.2 CEA 861 Timing

The GS1582 extracts timing information from externally provided HSYNC, VSYNC, and

DE signals when CEA 861 timing mode is selected by setting DETECT_TRS = LOW and

the TIM_861 = HIGH.

Horizontal sync (H), Vertical sync (V), and Data Enable (DE) timing must be provided via

the H/HSYNC, V/VSYNC and F/DE input pins. The host interface register bit H_CONFIG

will be ignored in the CEA 861 input timing mode.

The GS1582 will determine the EIA/CEA-861 standard and embed EAV and SAV TRS

words in the output serial video stream.

Video standard detection is not dependent on the HSYNC pulse width or the VSYNC

pulse width and therefore the GS1582 will tolerate non-standard pulse widths. In

addition, the device can compensate for up to ±1 PCLK cycle of jitter on VSYNC with

respect to HSYNC and sample VSYNC correctly.

NOTE 1: The period between the leading edge of the HSYNC pulse and the leading edge

of Data Enable (DE) must follow the timing requirements described in the EIA/CEA-861

specification. The GS1582 embeds TRS words according to this timing relationship to

maintain compatibility with the corresponding SMPTE standard.

NOTE 2: When CEA 861 standards 6 & 7 [720(1440)x480i] are presented to the GS1582,

the device will embed TRS words corresponding to the timing defined in SMPTE 125M

to maintain SMPTE compatibility.

CEA 861 standards 6 & 7 [720(1440)x480i] define the active area on lines 22 to 261 and

285 to 524 inclusive (240 active lines per field). SMPTE 125M defines the active area on

lines 20 to 263 and 283 to 525 inclusive (244 lines on field 1; 243 lines on field 2).

Therefore, in the first field, the GS1582 adds two active lines above and two active lines

below the original active image. In the second field it adds two lines above and one line

below the original active image.

GS1582 Multi-Rate Serializer with Cable Driver, Audio

Multiplexer and ClockCleanerTM

Data Sheet

40117 - 4

December 2011

31 of 115

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