Block Diagrams; Block Diagram For Usb Host Differential Connection (Port 1 Or Port 2) - Intel PXA27 Series Design Manual

Universal Serial Bus Host Interface
20.3

Block Diagrams

20.3.1 Block Diagram for USB Host Differential Connection (Port 1
or Port 2)
The Host Controller Port 1 is only used with a differential connection. The Host Controller Port 2
also is used with a differential connection.
See the block diagram in
connections to USB Host Port 2 of the PXA27x processor.
Figure 20-1. USB Host (Port 1 or Port 2) Differential Connections Block Diagram
PXA27x
Processor
USB Host
Controller
II:20-2
Figure 20-1
USBHPEN<1>
USBHPWR<1>
USBH_P<1>
C
P
USBH_N<1>
C
P
for USB Host Port 2 differential connections, except
+5V
CONTROL VBUS
USB Power
Switch Circuitry
(Required)
FAULT
R
S
R
Termination,
Filtering, and
P
ESD Protection
Circuitry
(Optional)
R
S
R
P C = 68 - 75 pF
P
R = 10 - 25 Ohms
S
R = 15K Ohms
P
®
Intel PXA27x Processor Family Design Guide
USB Host
Cable
Connector
1
VBUS (+5V)
4
GND
3
USB D+
2
USB D-
USBH_001_P2