SMSC USB2504 - Manual (Page 4)

Integrated USB 2.0 Compatible 4-Port Hub
Revision 2.3 (08-27-07) 4 SMSC USB2504/USB2504A
PRODUCT PREVIEW
Block Diagram
Figure 1 4-Port Block Diagram
Upstream
V
BUS
Upstream
PHY
Upstream
USB Data
Repeater
Controller SIE
Serial
Interface
PLL
24 MHz
Crystal
To
EEPROM
or SMBus
Master
Routing Logic
SCL SD
TT
#1
TT
#2
TT
#3
TT
#4
Port
Controller
Downstream
PHY #1
Port #1
OC Sense
Switch Driver
LED Drivers
Downstream
PHY #4
Port #4
OC Sense
Switch Driver
LED Drivers
...
Downstream
USB Data
OC
Sense
Switch/LED
Drivers
Downstream
USB Data
OC
Sense
Switch/LED
Drivers
V
BUS
Power
Detect
Pin
Strapping
Options
Internal
Defaults
Select
3.3V
1.8V
Reg.
1.8V
Cap