LPC47N237-MD datasheet(80/138 Pages) SMSC

80 / 138 page

3.3v I/O Controller for Port Replicators and Docking Stations

Revision 0.3 (10-26-04)

Page 80

SMSC DS – LPC47N237

DATASHEET

Table 15.1 – SMBus Pins

PIN NAME

TYPE

PWR WELL

DESCRIPTION

SMB_A0

VTR

SMBus LSB address pin with

SCLK

IOD

VTR

SMBus Clock IOD

SDAT

IOD

VTR

SMBus Data IOD

nSMBINT

VTR

Active low SMBus Interrupt Open-Drain output

SCLK_1

IOD

VTR

SMBus Clock IOD

SDAT_1

IOD

VTR

SMBus Data IOD

SCLK_2

IOD

VTR

SMBus Clock IOD

SDAT_2

IOD

VTR

SMBus Data IOD

15.1.2 Bus Protocols

Typical Write Byte, Read Byte protocols are shown below. Register accesses are performed using 7-bit

slave addressing, an 8-bit register address field, and an 8-bit data field. The shading indicates the

LPC47N237 driving data on the SDAT line; otherwise host data is on the SDAT line.

The slave address is the unique SMBus Interface Address for the LPC47N237 that identifies it on SMBus.

The register address field is the internal address of the register to be accessed. The register data field is

the data that the host is attempting to write to the register or the contents of the register that the host is

attempting to read.

Data bytes are transferred MSB first.

When using the LPC47N237 SMBus Interface, a read and write will always consist of the SMBus Interface

Address byte, followed by the Register Address byte, then the data byte.

Write Byte

The Write Byte protocol is used to write data to the registers. The data will only be written if the protocol

shown in Table 15.2 is performed correctly. Only one byte is transferred at time for a Write Byte protocol.

Table 15.2

− SMBus Write Byte Protocol

Field: Start

Slave Addr

Ack

Reg. Addr

Ack

Reg. Data

Ack

Stop

Bits:

Read Byte

The Read Byte protocol is used to read data from the registers. The data will only be read if the protocol

shown in Table 15.3 is performed correctly. Only one byte is transferred at time for a Read Byte protocol.

Table 15.3

− SMBus Read Byte Protocol

Field: Start

Slave Addr

Ack

Reg. Addr Ack Start

Slave Addr

Ack

Reg. Data

Nack

Stop

Bits:

15.1.3 Slave Address

The slave address is the unique address for the LPC47N237 that identifies the device on SMBus.

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