XR22417 Datasheet, PDF (7/17 Pages) Exar Corporation – USB 2.0 7-Port Hub

Functional Block Diagram
XR22417
XR22417
USB Host
Upstream Phy
Port
Indicators
12
MHz
Overcurrent
Detection
LED
Controller
Upstream Port Controller
Hub
Controller
Oscillator
PLL (x40)
5V to 3.3V 3.3V to 1.8V
Regulator Regulator
480
MHz
Downstream Port Controller
Hub
Activity
Indicator
Power
Control
Port Routing Switch
TT #1
TT #2
...
TT #7
Downstream Downstream
...
Downstream
Phy #1
Phy #2
Phy #7
Device #1 Device #2
...
Device #7
Figure 2. Functional Block Diagram
REV1A
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