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06/05/15

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PI6CFGL401B

4-Output Low Power PCIE Gen 1-2-3 Clock Generator

Serial Data Interface (SMBus)

This part is a slave only device that supports blocks read and block write protocol using a single 7-bit address and read/write bit as

shown below.

Read and write block transfers can be stopped after any complete byte transfer by issuing STOP.

Address Assignment

Refer to SMBus Address Selection Table.

Data Protocol

(Write)

1 bit

8 bits

1

8 bits

1

8 bits

1

8 bits

1

8 bits

1

1 bit

Start bit Slave

Addr: D4 Ack

Register

offset

Ack

Byte

Count=N Ack

Data

Byte 0

Ack

…

Data

Byte N-1 Ack

Stop bit

(Read)

1 bit

8

bits

1

8 bits

1

1

8

bits

1

8 bits

1

8

bits

1

8

bits

1

1

bit

Start

bit

Slave

Addr:

D4

Ack

Register

offset

Ack

Repeat

start

Slave

Addr:

D5

Ack

Byte

Count=N Ack

Data

Byte 0 Ack …

Data

Byte

N-1

NOT

Ack

Stop

bit

Note:

1.Register offset for indicating the starting register for indexed block write and indexed block read. Byte Count in write mode cannot be 0.

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