GS2986 datasheet(32/41 Pages) SEMTECH

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

Chain Position = N

Chain Position = N (N = 0 for first device in chain)

Chain Length = K (K ≥ 1)

GS2986 Datasheet(PDF) 32 Page - Semtech Corporation