Chapter 10
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Figure 10-3 MSC State Machine
Upon detecting that the MSC device is connected, the device will enter an infinite loop
waiting to receive the first CBW from the host. Depending on the command received, the
device will either enter the data phase or transmit CSW phase. In the event of any stall
conditions in the data phase, the host must clear the respective endpoint before
transitioning to the CSW phase. If an invalid CBW is received from the host, the device shall
enter reset recovery state where both endpoints are stalled to complete the full reset with
the host issuing the Bulk-Only Mass Storage Reset Class Request. After a successful CSW
phase or a reset recovery, the task will return to receive the next CBW command. If at any
stage the device is disconnected from the host the state machine will transition to the None
state.
172
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