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USB2642 데이터시트(PDF) 26 Page - Microchip Technology

부품명 USB2642
상세설명  USB 2.0 Hub and Flash Media Card Controller Combo
PDF  56 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB2642 데이터시트(HTML) 26 Page - Microchip Technology

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USB2642
DS00001578C-page 26
 2014-2015 Microchip Technology Inc.
7.4.2.10
A0h-A3h: Reserved
7.4.2.11
A4h-A5h: LUN 0 Power Configuration
The USB2642 has one internal FET which can be utilized for card power. The settings are stored in NVSTORE and
provide the following features:
1.
A card can be powered by an external FET or by an internal FET.
2.
The power limit is set to 200 mA default for the internal FET, but can be set to 100 mA.
Each media uses two bytes to store its LUN power configuration. Bit 3 selects between internal or external. For internal
FETs bits 0 through 2 are used for the power limit. Only 2 of the possible 8 values are currently specified.
7.4.2.12
A6h-BEh: Reserved
7.4.3
DEVICE ID STRINGS
7.4.3.1
BFh-C5h: Device 3 Identifier String
7.4.3.2
C6h-CDh: Inquiry Vendor String
Byte
Name
Description
3:0
rsvd
TABLE 7-4:
FET CONFIGURATION
FET
Type
Bits
Bit Type
Description
0FET Lo
Byte
3:0
Low Nibble
rsvd
1
7:4
High Nibble
2FET Hi
Byte
3:0
Low Nibble
0000b Disabled
0001b External FET enabled
1000b Internal FET with 100 mA power limit
1010b Internal FET with 200 mA power limit
3
7:4
High Nibble
rsvd
Byte
Name
Description
25:0
rsvd
Byte
Name
Description
6:0
DEV3_ID_STR
These bytes are used to specify the LUN descriptor returned by the device.
These bytes are used in combination with the LUN to device mapping bytes
in applications where the OEM wishes to reorder and rename the LUNs. If
this device is configured to be part of a COMBO LUN then this string is
ignored for the appropriate CLUNx_ID_STR.
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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