USB2504A View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'USB2504A' PDF : 46 Pages View PDF
5.6.1.2 RESET_N for EEPROM Configuration
Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
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.
All Power Supplies must have reached the operating levels mandated in Section Chapter 8, "DC
Parameters", prior to (or coincident with) the assertion of RESET_N.
Revision 2.3 (08-27-07)
36
DATASHEET
SMSC USB2504/USB2504A
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