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GS2986 датащи(PDF) 32 Page - Semtech Corporation |
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GS2986 датащи(HTML) 32 Page - Semtech Corporation |
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32 / 41 page ![]() GS2986 Multi-Rate SDI Reclocker with Equalization & De-emphasis Data Sheet 52134 - 3 July 2012 32 of 41 3. Command2’ refers to the altered or decremented Command2. 4.15.13 Reading from a Single Device in the Chain The following example shows how to read from a single device in a chain: Figure 4-16: Daisy Chain Read from a Single Device 1. Read command and 16 cycles of data held HIGH are issued to chain position N. 2. 32xN cycles are applied with data HIGH to cycle the command through N devices in the chain (NOTE: N is 0 for first device in chain). Device N executes the command. 3. With K representing the total number of devices in the chain, 32x(K-N-1) cycles are applied to bring the return data through the rest of the chain. 4. 16 additional cycles are applied until the Data from device N is available on the Master SDI. MOSI MISO CommandN [15:0] DataN [15:0] CommandN’ [15:0] Data High 16 cycles Data High 32xN cycles Data High 32x(K-N-1) cycles Data High 16 cycles Data High 16 cycles Chain Position = N CS Chain Position = N (N = 0 for first device in chain) Chain Length = K (K ≥ 1) |
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