USB2640 datasheet(33/60 Pages) MICROCHIP

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DS00001947C-page 33

USB2640/USB2641

7.3.5.2

DFh: Vendor ID (MSB)

7.3.5.3

E0h: Product ID (LSB)

7.3.5.4

E1h: Product ID (MSB)

7.3.5.5

E2h: Device ID (LSB)

7.3.5.6

E3h: Device ID (MSB)

7.3.5.7

E4h: Configuration Data Byte 1 (CFG_DAT_BYT1)

Bit

Byte Name

Description

7:0

VID_MSB

Most Significant Byte of the Vendor ID. This is a 16-bit value that uniquely

identifies the Vendor of the user device (assigned by USB Implementer’s

Forum).

Bit

Name

Description

7:0

PID_LSB

Least Significant Byte of the Product ID. This is a 16-bit value that the vendor

can assign that uniquely identifies this particular product.

Bit

Name

Description

7:0

PID_MSB

Most Significant Byte of the Product ID. This is a 16-bit value that the vendor

can assign that uniquely identifies this particular product.

Bit

Name

Description

7:0

DID_LSB

Least Significant Byte of the Device ID. This is a 16-bit device release number

in BCD (binary coded decimal) format.

Bit

Name

Description

7:0

DID_MSB

Most Significant Byte of the Device ID. This is a 16-bit device release number

in binary coded decimal (BCD) format.

Bit

Name

Description

SELF_BUS_PWR

Self- or Bus-Power: Selects between self- and bus-powered operation.

The hub is either self-powered (draws less than 2 mA of upstream bus power)

or bus-powered (limited to a 100 mA maximum of upstream power prior to

being configured by the host controller).

When configured as a bus-powered device, the Microchip hub consumes less

than 100 mA of current prior to being configured. After configuration, the bus-

powered Microchip hub (along with all associated hub circuitry, any embedded

devices if part of a Compound Device, and 100 mA per externally available

downstream port) must consume no more than 500 mA of upstream VBUS

current. The current consumption is system dependent, and the OEM must

ensure that the USB 2.0 Specification is not violated.

When configured as a self-powered device, <1 mA of upstream VBUS current

is consumed and all ports are available, with each port being capable of

sourcing 500 mA of current.

‘0’ = Bus-powered operation

‘1’ = Self-powered operation

Reserved

Always reads ‘0’.

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