Samsung S5PC100 User Manual page 851

USB2.0 HS OTG
7 I/O DESCRIPTION
Function Signal
USB_DP
USB_DM
USB_XTI
USB_XTO
USB_REXT
(1)
USB_VBUS
USB_ID
USB_DRVVBUS
NOTE 1 : USB2.0 HS OTG module can operate in device mode when the voltage on USB_VBUS is valid. To be valid in device
mode, the voltage on USB_VBUS is required to be between 4.75V and 5.25V.
In host mode, OTG makes USB_DRVVBUS low if the voltage on USB_VBUS is lower than the threshold voltage.
The setting value in OPHYTUNE[16:14] can change the threshold voltage on USB_VBUS.
A register in GPIO has to be set for USB to work appropriately.
Register Address
ETC4DRV 0xE030056C
To use crystal, The 8th and 9th of Port Group ETC4 Control register based on address 0xE030056C is guided to
be set differently depending on the crystal input frequency of USB.
th th
9 bit 8 bit
0 0
0 1
1 0
1 1
8.10 -8
I/O
Input/Output Data Plus Signal from the USB Cable
Input/Output Data Minus Signal from the USB Cable
Input Crystal Oscillator XI
Output Crystal Oscillator XO
Input/Output Connection to the External 44.2 ohms
register
Input/Output USB 5V Power detection
Input/Output This signal indicates whether the
connected plug is mini-A or mini-B.
Low : Mini-A connected
High: Mini-B connected
This controller signal enables or disables
Output
external charge pump.
R/W
R/W Port Group ETC4 Drive strength control Register
Output
Driver X1
Driver X2
Driver X4
Driver X8
Description
Description
S5PC100 USER'S MANUAL (REV1.0)
Pad
Xusb DP
XusbDM
XusbXTI
XusbXTO
XusbREXT
XusbVBUS
XusbID
XusbDRVVBU
S
Reset Value
comment
32KHz ~ 1MHz
1MHz ~ 15MHz
15MHz ~ 30MHz
30MHz ~ 50MHz
Type
Dedicated
Dedicated
Dedicated
Dedicated
Dedicated
Dedicated
Dedicated
Dedicated
0x0000