Altera cyclone V Technical Reference page 2475

Hard processor system

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USB 2.0 OTG Controller

Send Feedback

Defines IN NAK conditions.

The application uses this bit to signal the otg core to

do a soft disconnect. As long as this bit is Set, the host

does not see that the device is connected, and the

device does not receive signals on the USB. The core

stays in the disconnected state until the application

clears this bit. There is a minimum duration for which

the core must keep this bit set. When this bit is

cleared after a soft disconnect, the core drives the

phy_opmode_o signal on the ULPI, which generates a

device connect event to the USB host. When the

device is reconnected, the USB host restarts device

enumeration.;

A handshake is sent out based on the data

availability in the transmit FIFO

A NAK handshake is sent out on all non-

periodic IN endpoints, irrespective of the

data availability in the transmit FIFO.

Normal operation

The core drives the phy_opmode_o signal on

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