20H04 Datasheet, PDF (10/38 Pages) SMSC Corporation – 4-PORT USB2.0 HUB CONTROLLER

Chapter 2 Functional Block Diagram
4-Port USB2.0 Hub Controller
Datasheet
To Upstream Upstream
V_BUS
USB Data
24 MHz
Crystal
Pin
Selectable
Options
To EEPROM or
SMBus Master
SD SCK
Bus-Power
Detect/
V_BUS Pulse
Upstream
PHY
Repeater
PLL
Internal
Configuration
Select
Serial
Interface
SIE
Controller
TT TT TT TT
#1 #2 #3 #4
Port
Controller
Routing Logic
Downstream
PHY #1
Port #1
OC Sense
Switch Driver
LED Drivers
Downstream
PHY #4
Port #4
OC Sense
Switch Driver
LED Drivers
Downstream OC Switch/LED
USB Data Sense Drivers
Downstream OC Switch/LED
USB Data Sense Drivers
Figure 2.1 - Block Diagram
Revision 1.63 (10-14-04)
Page 10
DATASHEET
SMSC USB20H04