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4-Port USB 2.0 Controller
Datasheet
SMSC USB20H04 Page 25 Revision 1.63 (03-30-07)
DATASHEET
8.4.1.1 SMBus Configuration Timing
Figure 8.3 - Timing for Configuration from SMBus
Table 8.7 - Time Values to Configure from SMBus
NAME DESCRIPTION MIN TYP MAX UNITS
T1 RESET_N asserted 100 nsec
T2 USB20H04 recovery/stabilization – until first
external SCK/SCL activity
16 32 nsec
T3 Implementation dependent load time
T4 Configuration finished to Hub enabled 35 70 nsec
RESET_N
t1 t2
t3
GND
Hardware
Reset Asserted
CS/EE_SEL
& SMB_SEL_N
strapping
options read
First External
SCK/SCL
Activity
Configuration
Finished
SCK/SCL
t4
Hub Function
Enable