4.8 USB Interface Signals –Table 3
Name
Type
Description
USBP12P,
USBP12N,
USBP13P,
USBP13N
I/O
Universal Serial Bus Port [13:12] Differential:
These
differential pairs are used to transmit Data/Address/Command
signals for ports 13 and 12. These ports can be routed to UHCI
controller #7 or the EHCI controller #2.
NOTE:
No external resistors are required on these signals. The
Ibex Peak integrates 15 k
Ω
pull-downs and provides an output
driver impedance of 45
Ω
which requires no external series
resistor.
OC0# /
GPIO59
OC1# /
GPIO40
OC2# /
GPIO41
OC3# /
GPIO42
OC4# /
GPIO43
OC5# /
GPIO9
OC6# /
GPIO10
OC7# /
GPIO14
I
Overcurrent Indicators:
These signals set corresponding bits
in the USB controllers to indicate that an overcurrent condition
has occurred.
OC[7:0]# may optionally be used as GPIOs.
NOTES:
1. OC# pins are not 5 V tolerant.
2. OC# pins must be shared between ports
3. OC#[3:0] can only be used for EHCI controller #1
4. OC#[4:7] can only be used for EHCI controller #2
USBRBIAS
O
USB Resistor Bias:
Analog connection point for an external
resistor. Used to set transmit currents and internal load
resistors.
USBRBIAS#
I
USB Resistor Bias Complement:
Analog connection point
for an external resistor. Used to set transmit currents and
internal load resistors.