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EVB-USB2250

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P43
2009 - 2015 Microchip Technology Inc. DS00002005A-page 25
USB2250/50i/51/51i
7.2.3.13 32h-5Dh: Reserved
7.2.3.14 5Eh: USB Product String Descriptor Length
7.2.3.15 5Fh: USB Product String Descriptor Type
7.2.3.16 60h-99h: USB Product String Option
7.2.3.17 9Ah: USB BmAttribute (1 byte)
7.2.3.18 9Bh: USB MaxPower (1 byte)
Byte Name Description
59:16 Reserved Reserved.
Byte Name Description
0 USB_PRD_STR
_LEN
USB product string descriptor length as defined by Section 9.6.7 “String” of the
USB 2.0 Specification (Revision 2.0, 2000). This field is the “bLength” which
describes the size of the string descriptor (in bytes). Maximum string length is
29 characters
Byte Name Description
1 USB_PRD_STR
_TYP
USB product string descriptor type as defined by Section 9.6.7 “String” of the
USB 2.0 Specification (Revision 2.0, 2000). This field is the “bDescriptorType”
which is a constant value associated with a string descriptor type.
Byte Name Description
59:2 USB_PRD_STR This string will be used during the USB enumeration process in the Windows
®
operating system. Maximum string length is 29 characters.
Byte Name Description
7:0 USB_BM_ATT Self- or Bus-Power: Selects between self- and bus-powered operation.
The hub is either self-powered (draws less than 2 mA) or bus-powered (limited
to 100 mA maximum power prior to being configured by the host controller).
When configured as a bus-powered device, the Microchip device consumes
less than 100 mA of current prior to being configured. After configuration, the
bus-powered Microchip device (along with all associated device 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 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 current is consumed and
all ports are available, with each port being capable of sourcing 500 mA of
current.
80 = Bus-powered operation (default)
C0 = Self-powered operation
A0 = Bus-powered operation with remote wake-up
E0 = Self-powered operation with remote wake-up
Byte Name Description
7:0 USB_MAX_PWR USB Max Power per the USB 2.0 Specification. Do NOT set this value greater
than 100 mA.
USB2250/50i/51/51i
DS00002005A-page 26 2009 - 2015 Microchip Technology Inc.
7.2.3.19 9Ch-9Fh: Attribute Byte Descriptions
7.2.4 A0H-A7H: DEVICE POWER CONFIGURATION
The USB2250/50i/51/51i has four internal FETs which can be utilized for card power. This section describes the default
internal configuration. 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 can be set to 100 mA or 200 mA (Default) for the internal FET.
Each media uses two bytes to store its device power configuration. Bit 3 selects between internal or external card power
FET options. For internal FET card power control, bits 0 through 2 are used to set the power limit. The “Device Power
Configuration” bits are ignored unless the “Enable Device Power Configuration” bit is set. See Section 7.2.3.19, "9Ch-
9Fh: Attribute Byte Descriptions," on page 26.
Byte Byte Name Bit Description
0 ATT_LB 3:0 Always reads ‘0’.
4 Inquire Manufacturer and Product ID Strings
‘1’ - Use the Inquiry Manufacturer and Product ID Strings.
‘0’ (default) - Use the USB Descriptor Manufacturer and Product ID Strings.
5 Always reads ‘0’.
6 Reverse SD Card Write Protect Sense
‘1’ (default) - SD cards will be write protected when SW_nWP is high, and
writable when SW_nWP is low.
‘0’ - SD cards will be write protected when SW_nWP is low, and writable
when SW_nWP is high.
7 Reserved.
1 ATT_HLB 3:0 Always reads ‘0’.
4 Activity LED True Polarity
‘1’ - Activity LED to Low True.
‘0’ (default) - Activity LED polarity to High True.
5 Common Media Insert / Media Activity LED
‘1’ - The activity LED will function as a common media inserted/media access
LED.
‘0’ (default) - The activity LED will remain in its idle state until media is
accessed.
6 Always reads ‘0’.
7 Reserved.
2 ATT_LHB 0 Attach on Card Insert / Detach on Card Removal
‘1’ - Attach on Insert is enabled.
‘0’ (default) - Attach on Insert is disabled.
1 Always reads ‘0’.
2 Enable Device Power Configuration
‘1’ - Custom Device Power Configuration stored in the NVSTORE is used.
‘0’ (default) - Default Device Power Configuration is used.
7:3 Always reads ‘0’.
3 ATT_HB 6:0 Always reads ‘0’.
7 xD Player Mode
2009 - 2015 Microchip Technology Inc. DS00002005A-page 27
USB2250/50i/51/51i
7.2.4.1 A0h-A1h: Memory Stick Device Power Configuration
7.2.4.2 A2h-A3h: Compact Flash Device Power Configuration
7.2.4.3 A4h-A5h: Smart Media Device Power Configuration
7.2.4.4 A6h-A7h: Secure Digital Device Power Configuration
FET Type Bits Bit Type Description
0 FET Lo Byte
MS_PWR_LB
3:0 Low Nibble 0000b Disabled
1 7:4 High Nibble
2 FET Hi Byte
MS_PWR_HB
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 0000b Disabled
FET Type Bits Bit Type Description
0 FET Lo Byte
CF_PWR_LB
3:0 Low Nibble 0000b Disabled
1 7:4 High Nibble
2 FET Hi Byte
CF_PWR_HB
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 0000b Disabled
FET Type Bits Bit Type Description
0 FET Lo Byte
SM_PWR_LB
3:0 Low Nibble 0000b Disabled
1 7:4 High Nibble
2 FET Hi Byte
SM_PWR_HB
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 0000b Disabled
FET Type Bits Bit Type Description
0 FET Lo Byte
SD_PWR_LB
3:0 Low Nibble 0000b Disabled
1 7:4 High Nibble
2 FET Hi Byte
SD_PWR_HB
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 0000b Disabled
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P43

EVB-USB2250

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Buy EVB-USB2250
Manufacturer:
Microchip Technology
Description:
Interface Development Tools USB2250 UltFastHiSpd Customer Eval Brd
Lifecycle:
New from this manufacturer.
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