Chapter 5 Switching Hub Block Diagram
EEPRO M
or SM Bus
M aster
24 M Hz
Crystal
Pin
Strapping
O ptions
1.8V
Cap
Upstream
USB Data
3.3V
Upstream
USB Data
Upstream
VBUS
SCL SD
Internal
Defaults
Select
1.8V
Reg.
VBUS Pow er
Detect
Serial
Interface
PLL
SIE
Upstream
PHY
Upstream
PHY
SIE
Controller
Controller
Repeater
Repeater
TT
#1
TT
#2
TT
#3
TT
#4
Port
Controller
Port
Controller
TT
#4
TT
#3
TT
#2
TT
#1
Routing Logic
Routing Logic
Sw itching Logic
Port
Assign
[3:0]
Port #1
Port #2
Port #3
Port #4
Dow nstream
PHY #1
O C Sense
Sw itch Driver
LED Drivers
Dow nstream
PHY #2
O C Sense
Sw itch Driver
LED Drivers
Downstream
PHY #3
O C Sense
Sw itch Driver
LED Drivers
Dow nstream
PHY #4
OC Sense
Sw itch Driver
LED Drivers
Downstream
USB Data
O C
Sense
Switch/LEDDownstream
Drivers USB Data
O C Switch/LED Downstream
Sense Drivers USB Data
O C Switch/LED Downstream
Sense Drivers USB Data
O C Switch/LED
Sense
Drivers
Figure 5.1 USB2524 Switching Hub Block Diagram
SMSC [ SMSC CORPORATION ]
