SMSC USB2512i Benutzerhandbuch
Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
SMSC USB2512i
29
Revision 1.92 (11-28-07)
DATASHEET
Notes:
When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than
100mA from the upstream USB power source during t1+t5.
100mA from the upstream USB power source during t1+t5.
All Power Supplies must have reached the operating levels mandated in
, prior to (or coincident with) the assertion of RESET_N.
4.6.2.2
RESET_N for EEPROM Configuration
Figure 4.4 Reset_N Timing for EEPROM Mode
Notes:
When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than
100mA from the upstream USB power source during t4+t5+t6+t7.
100mA from the upstream USB power source during t4+t5+t6+t7.
All Power Supplies must have reached the operating levels mandated in
, prior to (or coincident with) the assertion of RESET_N.
t7
USB Idle.
undefined
msec
t8
Completion time for requests (with or without data
stage).
5
msec
Table 4.4 Reset_N Timing for EEPROM Mode
NAME
DESCRIPTION
MIN
TYP
MAX
UNITS
t1
RESET_N Asserted.
1
μsec
t2
Hub Recovery/Stabilization.
500
μsec
t3
EEPROM Read / Hub Config.
2.0
99.5
msec
t4
USB Attach (See Note).
100
msec
t5
Host acknowledges attach and signals USB
Reset.
100
msec
t6
USB Idle.
undefined
msec
t7
Completion time for requests (with or without data
stage).
5
msec
Table 4.3 Reset_N Timing for Default/Strap Option Mode (continued)
NAME
DESCRIPTION
MIN
TYP
MAX
UNITS
t1
t2
t4
t5
t6
t7
RESET_N
VSS
Hardware
reset
asserted
Read Strap
Options
Read EEPROM
+
Set Options
Attach
USB
Upstream
USB Reset
recovery
Idle
Start
completion
request
response
t3