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Datasheet – SMSC USB2503A User Manual

Page 26

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Integrated USB 2.0 Compatible 3-Port Hub

Datasheet

Revision 2.3 (08-27-07)

26

SMSC USB2503/USB2503A

DATASHEET

5.3.9.1

Register 00h: Status/Command (Reset = 0x00)

5.3.9.2

Register 01h: Vendor ID (LSB) (Reset = 0x00)

0Ch

R/W

Max Power (Self)

MAXPS

7

6

5

4

3

2

1

0

0Dh

R/W

Max Power (Bus)

MAXPB

7

6

5

4

3

2

1

0

0Eh

R/W

Hub Controller
Max Current (Self)

HCMCS

7

6

5

4

3

2

1

0

0Fh

R/W

Hub Controller
Max Current (bus)

HCMCB

7

6

5

4

3

2

1

0

10h

R/W

Power-on Time

PWRT

7

6

5

4

3

2

1

0

BIT

NUMBER

BIT NAME

DESCRIPTION

7:3

Reserved

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

2

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.

1

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.}

0

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.

Table 5.4 SMBus Slave Interface Register Map (continued)

REG

ADDR

R/W

REGISTER NAME

ABBR

BIT 7

(MSB)

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

(LSB)

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