Integrated USB2.0 Compatible 4-Port Hub
Block Diagram
To
EEPROM
or SMBus
Master
Pin
Upstream Upstream 24 MHz
1.8V Strapping
Cap Options
3.3V
USB Data
VBUS
Crystal
SD SCL
Internal
Defaults
Select
VBUS
1.8V
Reg.
Serial
PLL
Interface
Power
Detect
Upstream
PHY
Controller
SIE
Repeater
TT
#1
TT
#2
TT
#3
TT
#4
Port
Controller
Routing Logic
Port #1
Port #4
Downstream
PHY #1
OC Sense
Downstream
PHY #4
OC Sense
...
Switch Driver
LED Drivers
Switch Driver
LED Drivers
Downstream OC Switch/LED
USB Data Sense Drivers
Downstream
USB Data
OC Switch/LED
Sense Drivers
Figure 1 4-Port Block Diagram
Revision 1.8 (11-11-05)
4
SMSC USB2504/USB2504A
PRODUCT PREVIEW
SMSC [ SMSC CORPORATION ]
