ICS9LRS3187B datasheet(6/21 Pages) RENESAS

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IDT® Programmable Timing Control Hub for Intel Based Systems

1602F—11/04/11

ICS9LRS3187B

Programmable Timing Control Hub for Intel Based Systems

Datasheet

General SMBus serial interface information for the ICS9LRS3187B

How to Write:

• Controller (host) sends a start bit.

• Controller (host) sends the write address D2

(H)

• IDT clock will

acknowledge

• Controller (host) sends the beginning byte location = N

• IDT clock will

acknowledge

• Controller (host) sends the data byte count = X

• IDT clock will

acknowledge

• Controller (host) starts sending

Byte N through

Byte N + X -1

• IDT clock will

acknowledge each byte one at a time

• Controller (host) sends a Stop bit

How to Read:

• Controller (host) will send start bit.

• Controller (host) sends the write address D2

(H)

• IDT clock will

acknowledge

• Controller (host) sends the begining byte

location = N

• IDT clock will

acknowledge

• Controller (host) will send a separate start bit.

• Controller (host) sends the read address D3

(H)

• IDT clock will

acknowledge

• IDT clock will send the data byte count = X

• IDT clock sends

Byte N + X -1

• IDT clock sends

Byte 0 through byte X (if X

(H)

was written to byte 8).

• Controller (host) will need to acknowledge each byte

• Controller (host) will send a not acknowledge bit

• Controller (host) will send a stop bit

IDT (Sla ve /Re ce ive r)

ACK

Byte N + X - 1

Data Byte Count = X

B eginning Byte N

stoP bit

Index Block Write Operation

S lave Address D2(H)

B eginning Byte = N

WRite

starT bit

Controlle r (Host)

starT bit

WRite

Repeat starT

ReaD

Beginning B yte N

Byte N + X - 1

Not acknowledge

PstoP bit

IDT (Sla ve /Re ce ive r)

Controlle r (Host)

ACK

Data Byte Count = X

ACK

S lave Address D3(H)

Index Block Read Operation

S lave Address D2(H)

B eginning Byte = N

ACK

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