USB 2.0 Hi-Speed Hub Controller
Datasheet
Chapter 4 Block Diagram
To EEPROM or
SMBus Master
SDA SCK
To Upstream
V
BUS
Upstream
USB Data
3.3 V
24 MHz
Crystal
Bus-
Power
Detect/
V
bus
Pulse
Upstream
PHY
Repeater
Regulator
PLL
Serial
Interface
Serial
Interface
Engine
Controller
3.3 V
Regulator
CRFILT
TT
#1
...
TT
#x
Port
Controller
Routing & Port Re-Ordering Logic
Port #1
PHY#1
OC Sense
Switch Driver/
LED Drivers
...
Port #x
PHY#x
OC Sense
Switch Driver/
LED Drivers
OC
USB Data
Port
Downstream Sense Power
Switch/
LED
Drivers
USB Data OC
Port
Downstream Sense Power
Switch/
LED
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
Note 4.2
USB2512A/USB2512Ai only supports a single transaction translator.
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 ]
