USB2512 SMSC Corporation, USB2512 Datasheet - Page 29

• Manufacturer Part Number: USB2512
• Description: USB 2.0 High-Speed 2-Port Hub Controller
• Manufacturer: SMSC Corporation

USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
SMSC USB2512
4.6.2.2
NAME
NAME
RESET_N
t7
t8
t1
t2
t3
t4
t5
t6
t7
VSS
Hardware
asserted
USB Idle.
Completion time for requests (with or without data
stage).
reset
RESET_N Asserted.
Hub Recovery/Stabilization.
EEPROM Read / Hub Config.
USB Attach (See Note).
Host acknowledges attach and signals USB
Reset.
USB Idle.
Completion time for requests (with or without data
stage).
Notes:
RESET_N for EEPROM Configuration
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
Parameters, prior to (or coincident with) the assertion of RESET_N.
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.
All Power Supplies must have reached the operating levels mandated in
Parameters, prior to (or coincident with) the assertion of RESET_N.
Table 4.3 Reset_N Timing for Default/Strap Option Mode (continued)
Read Strap
t1
Options
DESCRIPTION
DESCRIPTION
Figure 4.4 Reset_N Timing for EEPROM Mode
Table 4.4 Reset_N Timing for EEPROM Mode
Read EEPROM
Set Options
t2
+
DATASHEET
t4
t3
29
Upstream
Attach
USB
MIN
MIN
100
1
USB Reset
recovery
t5
undefined
undefined
TYP
TYP
2.0
t6
Idle
Chapter 5, DC
Chapter 5, DC
MAX
MAX
99.5
Revision 1.92 (11-28-07)
500
100
5
5
t7
completion
response
request
Start
UNITS
UNITS
msec
msec
msec
msec
msec
msec
msec
μsec
μsec