USB2502-HT View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'USB2502-HT' PDF : 44 Pages View PDF
2-Port USB 2.0 Hub Controller
Datasheet
Table 5.5 Reset_N Timing for Default/Strap Option Mode (continued)
NAME
DESCRIPTION
t6
Host acknowledges attach and signals USB
Reset.
t7
USB Idle.
t8
Completion time for requests (with or without data
stage).
MIN
TYP
MAX
100
undefined
5
UNITS
msec
msec
msec
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.
All Power Supplies must have reached the operating levels mandated in Section Chapter 7, "DC
Parameters", prior to (or coincident with) the assertion of RESET_N.
5.6.1.2 RESET_N for EEPROM Configuration
Hardware
reset
asserted
Read Strap
Options
Read EEPROM
+
Set Options
Attach
Start
USB
Upstream
USB Reset
recovery
Idle
completion
request
response
RESET_N
t4
t1
t2
t3
t5
t6
t7
VSS
Figure 5.3 Reset_N Timing for EEPROM Mode
Table 5.6 Reset_N Timing for EEPROM Mode
NAME
DESCRIPTION
t1
RESET_N Asserted.
t2
Hub Recovery/Stabilization.
t3
EEPROM Read / Hub Config.
t4
USB Attach (See Note).
t5
Host acknowledges attach and signals USB
Reset.
t6
USB Idle.
t7
Completion time for requests (with or without data
stage).
MIN
TYP
1
2.0
100
undefined
MAX
500
99.5
100
5
UNITS
μsec
μsec
msec
msec
msec
msec
msec
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.
Revision 2.3 (08-27-07)
34
DATASHEET
SMSC USB2502
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