USB2507 datasheet(22/42 Pages) MICROCHIP

22 / 42 page

USB2507

DS000002251A-page 22

 2007 - 2016 Microchip Technology Inc.

5.3.9.1

5.3.9.2

5.3.9.3

5.3.9.4

5.3.9.5

5.3.9.6

Bit Number

Bit Name

Description

7:3

Reserved

Reserved. {Note: Software must never write a ‘1’ to these bits}

RESET

Reset the SMBus Interface and internal memory back to RESET_N assertion

default settings. {Note: During this reset, this bit is automatically cleared to its

default value of 0.}

0 = Normal Run/Idle State.

1 = Force a reset.

WRITE_PROT

Write Protect: The external SMBus host sets this bit after the Hub’s internal

memory is loaded with configuration data. {Note: The External SMBus Host is

responsible for verification of downloaded data.}

0 = The internal memory (address range 01-10h) is not write protected.

1 = The internal memory (address range 01-10h) is “write-protected” to

prevent unintentional data corruption.}

Note:

{This bit is write once and is only cleared by assertion of the external

RESET_N pin.}

USB_ATTACH

USB Attach & power-down the SMBus Interface.

0 = Default; SMBus slave interface is active.

1 = Hub will signal a USB attach event to an upstream device, Note: SMBus

Slave interface will completely power down after the ACK has completed.

Note:

{This bit is write once and is only cleared by assertion of the external

RESET_N pin.}

Bit Number

Bit Name

Description

7:0

VID_LSB

Least Significant Byte of the Vendor ID.

Bit Number

Bit Name

Description

7:0

VID_MSB

Most Significant Byte of the Vendor ID.

Bit Number

Bit Name

Description

7:0

PID_LSB

Least Significant Byte of the Product ID.

Bit Number

Bit Name

Description

7:0

PID_MSB

Most Significant Byte of the Product ID.

Bit Number

Bit Name

Description

7:0

DID_LSB

Least Significant Byte of the Device ID.

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