GS1670 datasheet(2/126 Pages) SEMTECH

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GS1670 HD/SD SDI Receiver

Data Sheet

53831 - 2

September 2012

2 of 126

Description

The GS1670 is a multi-rate SDI Receiver which includes

complete SMPTE processing, as per SMPTE 292 and SMPTE

259M-C. The SMPTE processing features can be bypassed to

support signals with other coding schemes.

The device features an Integrated Reclocker with an

internal VCO and a wide Input Jitter Tolerance (IJT) of 0.7UI.

A serial digital loop-through output is provided, which can

be configured to output either reclocked or non-reclocked

serial digital data. The serial digital output can be connected

to an external cable driver.

The device operates in one of four basic modes: SMPTE

mode, DVB-ASI mode, Data-Through mode or Standby

mode.

In SMPTE mode, the GS1670 performs SMPTE

de-scrambling and NRZI to NRZ decoding and word

alignment. Line-based CRC errors, line number errors, TRS

errors and ancillary data check sum errors can all be

detected. The GS1670 also provides ancillary data

extraction. The entire ancillary data packet is extracted,

and written to host-accessible registers. Other processing

functions include H:V:F timing extraction, Luma and

Chroma ancillary data indication, video standard detection,

and SMPTE 352M packet detection and decoding. All of the

processing features are optional, and may be enabled or

disabled via the Host Interface.

In DVB-ASI mode, 8b/10b decoding is applied to the

received data stream.

In Data-Through mode all forms of SMPTE and DVB-ASI

processing are disabled, and the device can be used as a

simple serial to parallel converter.

The device can also operate in a lower power Standby

mode. In this mode, no signal processing is carried out and

the parallel output is held static.

Parallel data outputs are provided in 20-bit or 10-bit

multiplexed format for HD and SD video rates. The

associated Parallel Clock input signal operates at 148.5 or

148.5/1.001MHz (HD 10-bit multiplexed modes), 74.25 or

74.25/1.001MHz (for HD 20-bit mode), 27MHz (for SD 10-bit

mode) and 13.5MHz (for SD 20-bit mode).

Up to eight channels, in two groups, of serial digital audio

may be extracted from the video data stream, in accordance

with SMPTE 272M and SMPTE 299M. The output signal

formats supported by the device include AES/EBU and

three other industry standard serial digital formats. 16, 20

and 24-bit audio formats are supported at 48kHz

synchronous for SD modes and 48kHz synchronous or

asynchronous in HD mode. Additional audio processing

features include group selection, channel swapping, ECC

error detection and correction (HD mode only), and audio

channel status extraction. Audio clock and control signals

provided by the device include Word Clock (fs), Serial Clock

(64fs), and Audio Master Clock at user-selectable rates of

128fs, 256fs or 512fs.

Application: Multi-format Audio De-embedder Module

PCLK

10-bit

GS1662

DAC

Switch

Logic

Drivers

Analog

Audio

Outputs

AES

Audio

Outputs

AUDIO 1/ 2

AUDIO 3/ 4

AUDIO 5/ 6

AUDIO 7/ 8

Audio Clocks

SD/HD-SDI

(GS1574A

or GS2984)

GS1670

SD/HD-SDI

Application: Multi-format Digital VTR/Video Server

Storage:

Tape/HDD/Solid State

Audio

Processor

Video

Processor

20-bit

HV F/P CLK

Audio Outputs

V ideo Output

Audio Clocks

AUDIO 1/ 2

AUDIO 3/ 4

AUDIO 5/ 6

AUDIO 7/ 8

SD/HD-SDI

GS1670

(GS1574A

or GS2984)

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