Samsung S5PC100, User Manual

Page: 902 / 1863

S5PC100 USER’S MANUAL (REV1.0) USB2.0 HS OTG
8.10-59
DCTL Bit Description R/W Reset
Value
GNPINNakSts [2] Global Non-Periodic IN NAK Status
•
1'b0 : A handshake is sent based on the data availability in
the transmit FIFO.
•
1'b1 : A NAK handshake is sent out on all non-periodic IN
endpoints, irrespective of the data availability in the transmit
FIFO.
R 1'b0
SftDiscon [1] Soft Disconnect
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 will not
receive signals on the USB. The core stays in the
disconnected state until the application clears this bit.
•
1'b0 : Normal operation. If this bit is cleared after a soft
disconnect, the core drives the opmode signal on the UTMI+
to 2’b00, which generates a device connect event to the USB
host. If the device is reconnected, the USB host restarts
device enumeration.
•
1'b1 : The core drives the opmode signal on the UTMI+ to
2'b01, which generates a device disconnect event to the
USB host.
R/W 1'b0
RmtWkUpSig [0] Remote Wakeup Signaling
If the application sets this bit, the core initiates remote
signaling to wake up the USB host. The application must set
this bit to instruct the core to exit the Suspend state. As
specified in the USB 2.0 specification, the application must
clear this bit 1-15ms after setting it.
R/W 1'b0
The following table lists the minimum duration under various conditions for which the SoftDisconnect bit must be
set for the USB host to detect a device disconnect. To accommodate clock jitter, it is recommended that the
application add some extra delay to the specified minimum duration.
Operating Speed Device state Minimum Duration
High speed Suspended
1ms + 2.5
μ
s
High speed Idle
3ms + 2.5
μ
s
High speed Not Idle or Suspended
(Performing transactions) 125
μ
s
Full speed/ Low speed Suspended
1ms + 2.5
μ
s
Full speed/ Low speed Idle
2.5
μ
s
Full speed/ Low speed Not Idle or Suspended
(Performing transactions)
2.5
μ
s