GS2986 datasheet(30/41 Pages) SEMTECH

30 / 41 page

GS2986 Multi-Rate SDI Reclocker with Equalization &

De-emphasis

Data Sheet

52134 - 3

July 2012

30 of 41

4.15.9 Read & Write Operation - Daisy Chained Devices

In a serial daisy chain configuration, Read and/or Write operations can be performed to

multiple devices in the chain via consecutive operations. Figure 4-12 below shows a simple 3

device configuration.

Figure 4-12: Three Devices in Daisy Chain Configuration

4.15.10 Writing to all Devices

When writing to all devices in the chain, a Write Command and corresponding Data is required

for each device. When the devices are being configured in the same way, all of them will have

the same command and data with the exception of the Chain Position bits. This example

assumes a 3-device daisy chain. A command is issued to the last device in the chain first,

although it is possible to talk to the devices in any order.

Figure 4-13: Daisy Chain Write

1. The first command issued in time is the command for the last device in the chain (chain

position = 2). When the first device receives this command it will recognize that the Chain

Position is 2 and will not execute the command. It will duplicate the command and data

word at its output and decrement the Chain Position by one.

2. Consecutive commands are issued for each device in the chain as shown.

GS2986

SDI

SDO

GS2986

SDI

SDO

GS2986

SDI

SDO

MOSI

µC

MISO

Data [15:0]

Command0 [15:0]

Data [15:0]

MOSI Command2 [15:0]

Data High 32 cycles

Chain Position = 2

Data [15:0]

Command1 [15:0]

Chain Position = 1

Chain Position = 0

MISO

Data [15:0]

Command0' [15:0]

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