ISD-200 Datasheet, PDF (42/64 Pages) List of Unclassifed Manufacturers – USB Mass Storage Class Bulk-Only Specification Compliant

ISD-200 ASIC Datasheet
Device Descriptor (See Table 7):
bNumConfigurations = 1 if ‘Report One Configuration’ is set otherwise 2
Configuration Descriptor (See Table 8):
bConfigurationValue1 = 1
iConfiguration1 = 3
bMaxPower1 = (USB Current required by the peripheral system limited to under 500mA)
iInterface1 = 4
bConfigurationValue2 = 2
iConfiguration2 = 7
bMaxPower2 = 0x31 (98 mA)
iInterface2 = 8
Configuration 1 = Dynamic Configuration (NPWR500 asserted)
Configuration 2 = Self-Powered Configuration
Configuration 2 consists of configuration 1 values except with the 4 bytes of override
values from bConfigurationValue2, iConfiguration2, bMaxPower2, and iInterface2 (See
Tables 3 and 7-8).
If ‘Report One Configuration’ is set to 1:
o Configuration 1 will be returned when BUS_POWER is asserted.
o Configuration 2 will be returned when BUS_POWER is de-asserted.
If ‘Report One Configuration’ is set to 0:
o When BUS_POWER is asserted, bNumConfigurations in the device descriptor will be
overridden with 1 and Configuration 1 will be returned.
o When BUS_POWER is not asserted Configuration 1 and Configuration 2 will be
returned.
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In-System Design Confidential