USB 2.0 Hi-Speed Hub Controller
Datasheet
Chapter 4 Block Diagram
To EEPROM or
SMBus Master
To Upstream
VBUS
Upstream
USB Data
24 MHz
Crystal
SCK
SDA
3.3 V
Serial
Interface
Bus-
Power
Detect/
Vbus Pulse
Regulator
PLL
Upstream
PHY
Serial
Interface
Engine
Repeater
Controller
3.3 V
TT
#x
TT
#1
Port
Controller
...
Regulator
CRFILT
Routing & Port Re-Ordering Logic
Port #1
Port #x
OC Sense
Switch Driver/
LED Drivers
OC Sense
PHY#1
PHY#x
...
Switch Driver/
LED Drivers
USB Data
OC
USB Data
Port
OC
Port
Downstream
Sense
Switch/
LED
Sense
Switch/
LED
Downstream
Power
Power
Drivers
Drivers
The ‘x’ indicates the number of available downstream ports: 2, 3, 4, or 7.
Figure 4.1 USB251x Hub Family Block Diagram
Note 4.1 USB2512A/USB2512Ai only supports a single transaction translator.
Note 4.2 The LED port indicators only apply to USB2513/14 (48QFN only) and USB2517/17i.
SMSC USB251x
11
Revision 1.0 (3-11-09)
DATASHEET
SMSC [ SMSC CORPORATION ]
