USB3500-ABZJ Standard Microsystems (SMSC), USB3500-ABZJ Datasheet - Page 43

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USB3500-ABZJ

Manufacturer Part Number
USB3500-ABZJ
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet

Specifications of USB3500-ABZJ

Operating Temperature (min)
0C
Operating Temperature Classification
Commercial
Operating Temperature (max)
70C
Package Type
QFN
Rad Hardened
No
Lead Free Status / Rohs Status
Compliant
Hi-Speed USB Host, Device or OTG PHY With UTMI+ Interface
Datasheet
SMSC USB3500
7.14
HOST
Device
termselect
termselect
xcvrselect
xcvrselect
linestate
opmode
opmode
rxactive
rxvalid
txvalid
txvalid
data
DPPD & DMPD == 1
vbus
data
DM
DP
DPPD & DMPD == 0
USB Reset and Chirp
5Volt
The USB 2.0 specification describes USB Reset as a means of attaching a FS or a HS Device to a
Host. This discussion will focus on a HS device connecting to a HS host.
Figure 7.9
DMPD = 0). The following discussion applies to when the USB3500 is a configured as a Device and
is connected to another USB3500 configured as a Host. Since the Host and Device negotiate this
transition, both are discussed together and the user may follow this discussion for either a host or
device depending on the application of the USB3500. This sequence is also referred to as a “high-
speed chirp” due to the K-J pairs which the host sends to the downstream device.
Before the Host begins a session, it will set Xcvrselect to FS mode (10b) and Termselect to 1b to
activate the HS termination. The Host will also asserted the 15Kohm pull-down resistors on DP and
DM. The 15Kohm pull down resistors will pull DP and DM to 0 volts so that the Host Linestate will
return Single Ended Zero (SE0) when nothing is attached.
At time marker T0, the host link applies VBUS to the downstream port.
At T1, the Device has detected a valid voltage on VBUS and has asserted Termselect to enable the
1.5K ohm pull-up resistor on DP. During T1 the Host sees the linestate go from SEO to a J due to the
pull-up on DP.
T0
01
00
01
00
SE0
T1
shows the UTMI+ interface for both a Host (DPPD & DMPD = 1) and a Device (DPPD &
J
T2
SE0
00
T3
Figure 7.9 USB Reset and Chirp
00h
K
00
10
10
T4
seo
DATASHEET
T5
00
K
FF
J
43
00
K
FF
J
00
K
T6
00
Pairs
K-J
00-FF
T7
00
Revision 1.0 (06-05-08)
SE0
00h
T8
Hs SOF packet
Hs SOF packet
SOF
HS
A5h
J

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