EVB-USB2524 SMSC, EVB-USB2524 Datasheet - Page 50

• Manufacturer Part Number: EVB-USB2524
• Description: BOARD EVAL USB2524 SHARE/SWITCH
• Manufacturer: SMSC
• Series: MultiSwitch™r

Specifications of EVB-USB2524

• Main Purpose: Interface, USB 2.0 Hub
• Embedded: No
• Utilized Ic / Part: USB2524
• Primary Attributes: Quad Port Hub, High Speed (480Mbps), SMBus
• Secondary Attributes: Overcurrent Protection, Port Power Switching, Multi-TT Enabled
• Interface Type: USB
• Operating Supply Voltage: 5 V
• Product: Interface Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: USB2524
• Other names: 638-1044

Revision 1.91 (08-22-07)
9.1.1.3
9.1.2
NAME
RESET_N
t1
t2
t3
t4
t5
t6
t7
VSS
Hardware
asserted
reset
RESET_N Asserted.
Hub Recovery/Stabilization.
SMBus Code Load (See
Hub Configuration and USB Attach.
Host acknowledges attach and signals USB
Reset.
USB Idle.
Completion time for requests (with or without data
stage).
RESET_N for SMBus Slave Configuration
Note: For Bus-Powered configurations, the Hub and its associated circuitry will consume more than
Note 9.3
USB Bus Reset
In response to the upstream port signaling a reset to the Hub, the Hub does the following:
Note: The Hub does not propagate the upstream USB reset to downstream devices.
Sets default address to 0.
Sets configuration to: Unconfigured.
Negates PRTPWR[4:1] to all downstream ports.
Clears all TT buffers.
Moves device from suspended to active (if suspended).
100mA from the upstream USB power source during t2+t3+t4+t5+t6+t7.
t1
Negation
For Self-Powered configurations, t3 MAX is not applicable and the time to load the
configuration is determined by the external SMBus host.
Reset
DESCRIPTION
Figure 9.3 Reset_N Timing for SMBus Mode
Table 9.3 Reset_N Timing for SMBus Mode
SMBus Code
Note
t2
Load
9.3)
DATASHEET
Stabilization
t3
Hub PHY
50
t4
Upstream
Attach
USB
MIN
100
1
USB Reset
recovery
t5
Undefined
TYP
250
t6
Idle
MAX
500
300
100
USB MultiSwitch
5
t7
completion
response
request
SMSC USB2524
Start
UNITS
Datasheet
msec
msec
msec
msec
msec
μsec
μsec
TM
Hub