20H04 Datasheet, PDF (28/38 Pages) SMSC Corporation – 4-PORT USB2.0 HUB CONTROLLER

8.4.1.1 SMBus Configuration Timing
4-Port USB2.0 Hub Controller
Datasheet
SCK/SCL
t1
t2
t3
t4
RESET_N
GND
Hardware
Reset Asserted
CS/EE_SEL
& SMB_SEL_N
strapping
options read
First External
SCK/SCL
Activity
Configuration
Finished
Figure 8.3 - Timing for Configuration from SMBus
Hub Function
Enable
Table 8.7 - Time Values to Configure from SMBus
NAME
DESCRIPTION
MIN
TYP
T1 RESET_N asserted
100
T2 USB20H04 recovery/stabilization – until first
16
external SCK/SCL activity
T3 Implementation dependent load time
T4 Configuration finished to Hub enabled
35
MAX
32
70
UNITS
nsec
nsec
nsec
Revision 1.63 (10-14-04)
Page 28
DATASHEET
SMSC USB20H04