USB2250I datasheet(28/43 Pages) MICROCHIP

28 / 43 page

USB2250/50i/51/51i

DS00002005A-page 28

 2009 - 2015 Microchip Technology Inc.

7.2.4.5

A8h: LED Blink Interval

7.2.4.6

A9h: LED Blink Duration

7.2.5

DEVICE ID STRINGS

These bytes are used to specify the LUN descriptor returned by the device. These bytes are used in combination with

the device to LUN mapping bytes in applications where the OEM wishes to reorder and rename the LUNs. If multiple

devices are mapped to the same LUN (a COMBO LUN), then the CLUN#_ID_STR will be used to name the COMBO

LUN instead of the individual device strings. When applicable, the "SM" value will be overridden with xD once an xD-

Picture Card has been identified.

7.2.5.1

AAh-B0h: Device 0 Identifier String

7.2.5.2

B1h-B7h: Device 1 Identifier String

7.2.5.3

B8h-BEh: Device 2 Identifier String

7.2.5.4

BFh-C5h: Device 3 Identifier String

7.2.5.5

C6h-CDh: Inquiry Vendor String

Byte

Name

Description

LED_BLK_INT

The blink rate is programmable in 50 ms intervals. The high bit (7) indicates

an idle state:

‘0’ - Off

‘1’ - On

The remaining bits (6:0) are used to determine the blink interval up to a max

of 63 x 50 ms.

Byte

Name

Description

LED_BLK_DUR

LED Blink After Access. This byte is used to designate the number of seconds

that the LED will continue to blink after a drive access. Setting this byte to "05"

will cause the LED to blink for 5 seconds after a drive access.

Byte

Name

Description

6:0

DEV0_ID_STR

Not applicable.

Byte

Name

Description

6:0

DEV1_ID_STR

This ID string is associated with the Memory Stick device.

Byte

Name

Description

6:0

DEV2_ID_STR

This ID string is associated with the Smart Media device.

Byte

Name

Description

6:0

DEV3_ID_STR

This ID string is associated with the Secure Digital / MultiMediaCard device.

Byte

Name

Description

7:0

INQ_VEN_STR

If bit 4 of the 1st attribute byte is set, the device will use these strings in

response to a USB inquiry command, instead of the USB descriptor

manufacturer and product ID strings.

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