ICS9220B

Programmable Rambus

8

Operating Modes

Device ID and SMBus Device Address

The device ID (SMB_A(2:1)) is part of the SMBus device address. The least significant bit of the address designates a write

or read operation. Table 3 shows the addresses for four ICS9220 devices on the same SMBus.

Table 4: Operating Modes

Byte 1

LX

X

X

X

Z

Z

HX

1

X

X

HL

0

X

X

H

H

000

Z

Z

H

H

001

Z

CLK_INT/C

H

H

010

CLK_INT/C

Z

H

H

011

CLK_INT/C

CLK_INT/C

Notes

1 Bypass Mode

2 Power up default mode

CLK_INT/C

Reserved for Vendor Test

ODCLK_T/C1 ODCLK_T/C0

Byte 0

OE

BYPASS#/

PLL

Table 3. SMBus Device Addresses

Device

Control Function

AS2

AS1

Wr#/Rd

D8

0

D9

1

DA

0

DB

1

DC

0

DD

1

DE

0

DF

1

3

11011

0

1

0

1

0

0

1

Hex

Address

ICS 9220

Operation

Read

Write

Read

Write

Write

Read

Write

Read

0

1

2

8 bit SM Bus De vice Addre ss Including Oper.

1