ISD-200 ETC2 [List of Unclassifed Manufacturers], ISD-200 Datasheet - Page 18

• Manufacturer Part Number: ISD-200
• Description: USB Mass Storage Class Bulk-Only Specification Compliant
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

ISD-200 ASIC Datasheet
Configuration Source
Attached Device Power Source
Note: Internal ROM value options are listed here in case the Internal ROM mask is rolled for a specific
product/vendor application. See Table 3 and 7-11 for Internal ROM contents.
Table 4 – Valid Configuration Byte Settings
USB Interface
The USB port on the ISD-200 is electrically and logically compliant with the Universal Serial Bus
Specification Revision 1.1 (http://www.usb.org/developers/data/usbspec.zip).
Descriptor Requirements
Descriptors programmed into a serial ROM or vendor-specific Identify (FBh) command data must observe
the following constraints.
Configuration Descriptors
The ISD-200 can support one or two configuration descriptors. If the system can operate as USB Bus
powered and self powered, the ISD-200 requires that the first configuration descriptor be “dynamic” and
the second be self powered. If the system can only operate as USB Bus powered or self powered, then only
the first configuration descriptor is used (the second configuration descriptor is zeroed out and not reported
to the host). See Power Management , BUS_POWER pin section.
String Descriptor Indexes
The ISD-200 imposes constraints on what descriptor string index values are allowable. For those strings
that are optional, an index of 0x00 indicates that string is absent. Allowable string indexes are as follows:
16
iManufacturer -
iProduct -
iConfiguration1 -
iInterface1 -
iSerialNumber -
iConfiguration2 -
iInterface2 -
Mode of Operation
USB Bus or Self Powered
USB Bus or Self Powered
FBh (I_MODE) Data
Self-Powered Only
USB Bus Only
Internal ROM
Serial ROM
0x01 or 0x00 if unused
0x02 or 0x00 if unused
0x03 or 0x00 if unused
0x04 or 0x00 if unused
0x05 (must be present to be MSC compliant)
0x07 or 0x00 if unused
0x08 or 0x00 if unused
In-System Design Confidential
0
1
0
0/1
0/1
0/1
0
0
0
0
0/1
0/1
0/1
0/1
0/1
0
0
0
0
0
1
0/1
0
0
0