mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 987

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

39.7.2 OTG Dual Role B Device Operation
A device is considered a B device if it connected to the bus with a USB Type B cable or a
USB Type Mini B cable.
Freescale Semiconductor, Inc.
A_IDLE
A_WAIT_VRISE
A_WAIT_BCON
A_HOST
A_SUSPEND
A_PERIPHERAL
A_WAIT_VFALL
State
Table 39-96. State Descriptions for the Dual Role A Device Flow
If ID Interrupt.
The cable has been un-plugged or a Type B cable has been
attached. The device now acts as a Type B device.
If the A application wants to use the bus or if the B device is doing
an SRP as indicated by an A_SESS_VLD Interrupt or Attach or Port
Status Change Interrupt check data line for 5 –10 msec pulsing.
If ID Interrupt or if A_VBUS_VLD is false after 100 msec
The cable has been changed or the A device cannot support the
current required from the B device.
If A_VBUS_VLD interrupt
After 200 msec without Attach or ID Interrupt. (This could wait
forever if desired.)
A_VBUS_VLD Interrupt and B device attaches
Enumerate Device determine OTG Support.
If A_VBUS_VLD/ Interrupt or A device is done and doesn't think he
wants to do something soon or the B device disconnects
If the A device is finished with session or if the A device wants to
allow the B device to take bus.
ID Interrupt or the B device disconnects
If ID Interrupt, or if 150 msec B disconnect timeout (This timeout
value could be longer) or if A_VBUS_VLD\ Interrupt
If HNP enabled, and B disconnects in 150 msec then B device is
becoming the host.
If A wants to start another session
If ID Interrupt or if A_VBUS_VLD interrupt
If 3 –200 msec of Bus Idle
If ID Interrupt or (A_SESS_VLD/ & b_conn/)
Action
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Preliminary
Chapter 39 Universal Serial Bus (USB) Controller
Go to B_IDLE
Go to A_WAIT_VRISE
Turn on DRV_VBUS
Go to A_WAIT_VFALL
Turn off DRV_VBUS
Go to A_WAIT_BCON
Go to A_WAIT_FALL
Turn off DRV_VBUS
Go to A_HOST
Turn on Host Mode
Go to A_WAIT_VFALL
Turn off Host Mode
Turn off DRV_VBUS
Go to A_SUSPEND
Go to A_WAIT_BCON
Go to A_WAIT_VFALL
Turn off DRV_VBUS
Go to A_PERIPHERAL
Turn off Host Mode
Go to A_HOST
Go to A_WAIT_VFALL
Turn off DRV_VBUS.
Go to A_WAIT_BCON
Turn on Host Mode
Go to A_IDLE
Response
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