GS1675 datasheet(23/37 Pages) SEMTECH

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GS1675 SD/HD SDI Reclocker

Data Sheet

54174 - 1

June 2011

23 of 37

3.14.9 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 3-11 below shows a

simple 3 device configuration.

Figure 3-11: Three Devices in Daisy Chain Configuration

3.14.10 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 3-12: 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.

GS1675

SDI

SDO

GS1675

SDI

SDO

GS1675

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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