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GS2970A Datasheet(PDF) 34 Page - Semtech Corporation

Part # GS2970A
Description  3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

GS2970A Datasheet(HTML) 34 Page - Semtech Corporation

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GS2970A 3Gb/s, HD, SD SDI Receiver
Data Sheet
54244 - 2
September 2012
34 of 150
NOTE 1: The part will lock into ASI in Auto mode, but could falsely unlock for some ASI
input patterns.
NOTE 2: In Standby mode, the reclocker PLL unlocks. However, the LOCKED signal
retains whatever state it previously held. So, if before Standby assertion, the LOCKED
signal is HIGH, then during standby, it remains HIGH regardless of the status of the PLL.
4.7.1 Asynchronous Lock
The lock detection algorithm is a continuous process, beginning at device power-up or
after a system reset. It continues until the device is powered down or held in reset.
The device first determines if a valid serial digital input signal has been presented to the
device. If no valid serial data stream has been detected, the serial data into the device is
considered invalid, and the LOCKED signal is LOW.
Once a valid input signal has been detected, the asynchronous lock algorithm enters a
“hunt” phase, in which the device attempts to detect the presence of either TRS words or
DVB-ASI sync words.
By default, the device powers up in auto mode (the AUTO/MAN bit in the host interface
is set HIGH). In this mode, the device operating frequency toggles between 3G, HD and
SD rates as it attempts to lock to the incoming data rate. The PCLK output continues to
operate, and the frequency may switch between 148.5MHz, 74.25MHz, 27MHz and
13.5MHz.
When the device is operating in manual mode (AUTO/MAN bit in the host interface is
LOW), the operating frequency needs to be set through the host interface using the
RATE_DET[1:0] bits. In this mode, the asynchronous lock algorithm does not toggle the
operating rate of the device and attempts to lock within a single standard. Lock is
achieved within three lines of the selected standard.
Table 4-4:Lock Detect Conditions
Mode of Operation
Mode Setting
Condition for Locked
Data-Through Mode
SMPTE_BYPASS = LOW
DVB_ASI = LOW
Reclocker PLL is locked.
SMPTE Mode
SMPTE_BYPASS = HIGH
DVB_ASI = LOW
Reclocker PLL is locked. Two
consecutive TRS words are detected in
a two-line window.
SMPTE Mode with Lock
Noise-Immunity
Enabled
SMPTE_BYPASS = HIGH
DVB_ASI = LOW
Bit 0x085[10] set to 1
AUTO/MAN = HIGH
Reclocker PLL is locked. Two
consecutive TRS words are detected in
a two-line window. The last two
detected TRS words must have the
same alignment.
NOTE: Auto mode only. Not
supported in Manual mode.
DVB_ASI Mode
SMPTE_BYPASS = LOW
DVB_ASI = HIGH
Bit AUTO/MAN = LOW
Reclocker PLL is locked. 32 consecutive
DVB_ASI words with no errors are
detected within a 128-word window.


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