GS2986 Datasheet, PDF (32/41 Pages) Gennum Corporation – Standards indication in Auto mode

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:
CS
MOSI ^{CommandN [15:0]}
Chain Position = N
Data High 16 cycles
Data High 32xN cycles
Data High 32x(K-N-1) cycles
Data High 16 cycles Data High 16 cycles
MISO
CommandN’ [15:0] DataN [15:0]
Chain Position = N (N = 0 for first device in chain) Chain Length = K (K ≥ 1)
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.
GS2986 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
52134 - 3
July 2012
32 of 41