20H04 Datasheet, PDF (29/38 Pages) SMSC Corporation – 4-PORT USB2.0 HUB CONTROLLER

4-Port USB2.0 Controller
Datasheet
8.4.1.2 EEPROM Configuration Timing
SCK/SCL
t1
t2
RESET_N
GND
t3
t4
Hardware
Reset Asserted
CS/EE_SEL
& SMB_SEL_N
strapping
options read
First Clock
Rising Edge
Configuration
Finished
Figure 8.4 - Timing to Complete Configuration from EEPROM
Hub Function
Enable
Table 8.8 - Time Values to Configure From EEPROM
NAME
DESCRIPTION
MIN
TYP
T1 RESET_N asserted
100
T2 (I²C) USB20H04 recovery/stabilization – until
24
first rising edge of SCK/SCL
T3 (I²C) EEPROM configuration to final
8
SCK/SCL activity
T4 Configuration finished to Hub enabled
35
MAX
30
10
70
UNITS
nsec
µsec
msec
nsec
SMSC USB20H04
Page 29
DATASHEET
Revision 1.63 (10-14-04)