USB2412-DZK Standard Microsystems (SMSC), USB2412-DZK Datasheet - Page 15

• Manufacturer Part Number: USB2412-DZK
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB2412-DZK

• Lead Free Status / RoHS Status: Supplier Unconfirmed

2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
SMSC USB2412
RESET_N
Strap Pins
4.2.1.1
4.2.2
NAME
t1
t2
t3
t4
t5
t6
t7
t8
VSS
VSS
Hardware
asserted
reset
RESET_N Asserted.
Strap Setup Time
Strap Hold Time.
hub outputs driven to inactive logic states
USB Attach (See Note).
Host acknowledges attach and signals USB
Reset.
USB Idle.
Completion time for requests (with or without data
stage).
Don’t Care
RESET_N
Note: All power supplies must have reached the operating levels mandated in
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.
1. Sets default address to ‘0’.
2. Sets configuration to: Unconfigured.
3. Negates PRTPWR[2:1] to all downstream ports.
4. Clears all TT buffers.
Parameters, prior to (or coincident with) the assertion of RESET_N.
Read Strap
t1
Options
t2
Valid
DESCRIPTION
t3
Don’t Care
t4
Figure 4.1 Reset_N Timing
Table 4.1 Reset_N Timing
Drive Strap
Outputs to
inactive
levels
DATASHEET
t5
15
Upstream
Attach
USB
Driven by Hub if strap is an output.
16.7
16.7
MIN
100
1
USB Reset
recovery
t6
undefined
TYP
1.5
t7
Idle
MAX
1400
100
Revision 1.0 (02-12-10)
2
5
t8
Chapter 5, DC
completion
response
request
Start
UNITS
msec
msec
msec
msec
μsec
nsec
nsec
μsec