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GS2970A Datasheet(PDF) 96 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 96 Page - Semtech Corporation |
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96 / 150 page  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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