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Figure 22.
USB Device Controller Device State Transitions
SET_ADDRESS 0
SET_CONFIGURATION
SET_ADDRESS < > 0
SET_CONFIGURATION
SYSCON2.DEV_CFG not set
SET_CONFIGURATION
SYSCON2.DEV_CFG set
SET_ADDRESS
SET_CONFIGURATION
SYSCON2.DEV_CFG not set
SET_CONFIGURATION
Behavior not specified by USB 1.1 specifications (see chapter 9)
USB reset generates two interrupts (when USB reset is asserted and then when USB reset completes).
‡†
No interrupt is asserted by the core for tansitions shown with dashed lines.
SPRU761A
ATTACHED
USB Reset
or
†
DEFAULT
SET_ADDRESS 0
or
† †
USB Reset
SET_ADDRESS < > 0
or
ADDRESSED
SET_CONFIGURATION
SYSCON2.DEV_CFG set
CONFIGURED
†
(stalled) or
or
stalled
† †
† †
USB Reset
Remote
wake-up
enabled
SUSPEND
Remote
wake-up
enabled
USB Reset
SUSPEND
Remote
wake-up
enabled
SUSPEND
Universal Serial Bus (USB)
USB Device Controller
† †
159
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