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GS1675 SD/HD SDI Reclocker

Data Sheet

54174 - 1

June 2011

24 of 37

3.14.11 Writing to a Single Device in the Chain

The following example shows how to write to a single device in a chain:

Figure 3-13: Daisy Chain Write to a Single Device

1. The command is issued to Chain Position N.

2. 32xN cycles are required to shift the command through N devices. The device at

chain position N executes the command.

3. 32 additional cycles are needed to complete the communication.

3.14.12 Reading from all Devices

To read from all devices in the chain, a Read command is issued for each device

consecutively. After each command, the data is held HIGH for 16 cycles. Once a device

recognizes that it is being talked to, it will output data from the register requested. A

clock needs to be applied to cycle the output data through all devices in the chain.

Figure 3-14: Daisy Chain Read

DataN [15:0]

MOSI CommandN [15:0]

Data High 32xN cycles

Data High 32 cycles

Chain Position = N

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

DataN [15:0]

CommandN’ [15:0]

MISO

Command 2

Command 1

SDI

SDO

Data HIGH for

16 cycles

Command 0

Data HIGH for

16 cycles

Data HIGH for

16 cycles

(Chain Position = 0)

Data2

Data0

Data1

Data held

HIGH for 32x3

cycles

Command2’

Command1’

Command0’

SDI

SDO

(Chain Position = 1)

(Chain Position = 2)

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