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GS2970A Datasheet(PDF) 96 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) 96 Page - Semtech Corporation

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GS2970A 3Gb/s, HD, SD SDI Receiver
Data Sheet
54244 - 2
September 2012
96 of 150
Command Words are clocked into the GS2970A on the rising edge of the Serial Clock
SCLK, which operates in a burst fashion. The chip select (CS) signal must be set low a
minimum of 1.5ns (t0 in Figure 4-50) before the first clock edge to ensure proper
operation.
When the Auto-Increment bit is set LOW, each Command Word must be followed by
only one Data Word to ensure proper operation.
If the Auto-Increment bit is set HIGH, the following Data Word is written into the
address specified in the Command Word, and subsequent Data Words are written into
incremental addresses from the first Data Word. This facilitates multiple address writes
without sending a Command Word for each Data Word.
NOTE: The RSV bits in the GSPI command word can be set to zero as placeholder,
though these bits are not used.
4.20.2 Data Read or Write Access
During a read sequence (Command Word R/W bit set HIGH) serial data is transmitted or
received MSB first, synchronous with the rising edge of the serial clock SCLK. The Chip
Select (CS) signal must be set low a minimum of 1.5ns (t0 in Figure 4-50) before the first
clock edge to ensure proper operation. The first bit (MSB) of the Serial Output (SDOUT)
is available (t5 in Figure 4-51) following the last falling SCLK edge of the read Command
Word, the remaining bits are clocked out on the negative edges of SCLK.
NOTE: When several devices are connected to the GSPI chain, only one CS may be
asserted during a read sequence.
During a write sequence (Command Word R/W bit set LOW), a wait state of 37.1ns (t4 in
Figure 4-50) is required between the Command Word and the following Data Word. This
wait state must also be maintained between successive Command Word/Data Word
write sequences. When Auto Increment mode is selected (AutoInc = 1), the wait state
must be maintained between successive Data Words after the initial Command
Word/Data Word sequence.
During the write sequence, all Command and following Data Words input at the SDIN
pin are output at the SDOUT pin unchanged. When several devices are connected to the
GSPI chain, data can be written simultaneously to all the devices which have CS set
LOW.
Figure 4-49:Data Word Format
D15
D14
D13
D12
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D11
D10
MSB
LSB


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