USB3500 Datasheet, PDF (32/46 Pages) SMSC Corporation – Hi-Speed USB Host, Device or OTG PHY With UTMI+ Interface

Hi-Speed USB Host, Device or OTG PHY With UTMI+ Interface
Table 7.2 Host Linestate States (DPPD & DMPD = 1) (continued)
Datasheet
STATE OF DP/DM LINES
LINESTATE[1:0]
LS[1]
1
LS[0]
0
LOW SPEED
XCVRSEL[1:0]=10
TERMSELECT=1
LS-J
1
1
SE1
FULL SPEED
XCVRSEL[1:0]=01
TERMSELECT=1
FS-K
SE1
HIGH SPEED
XCVRSEL[1:0]=00
TERMSELECT=0
OPMODE=00/01
Invalid
Invalid
CHIRP MODE
XCVRSEL[1:0]=00
TERMSELECT=0
OPMODE=10
!Squelch &
!HS Differential
Receiver Output
Invalid
7.2
OPMODES
The OPMODE[1:0] pins allow control of the operating modes.
Table 7.3 Operational Modes
MODE[1:0] STATE NAME
DESCRIPTION
00
Normal Operation Transceiver operates with normal USB data encoding and decoding
01
Non-Driving
Allows the transceiver logic to support a soft disconnect feature which tri-
states both the HS and FS transmitters, and removes any termination from
the USB making it appear to an upstream port that the device has been
disconnected from the bus
10
Disable Bit Stuffing Disables bitstuffing and NRZI encoding logic so that 1's loaded from the
and NRZI encoding DATA bus become 'J's on the DP/DM and 0's become 'K's
11
Reserved
N/A
The OPMODE[1:0] signals are normally changed only when the transmitter and the receiver are
quiescent, i.e. when entering a test mode or for a device initiated resume.
When using OPMODE[1:0] = 10, the SYNC and EOP patterns are not transmitted.
The only exception to this is when OPMODE[1:0] is set to 10 while TXVALID has been asserted (the
transceiver is transmitting a packet), in order to flag a transmission error. In this case, the USB3500
has already transmitted the SYNC pattern so upon negation of TXVALID the EOP must also be
transmitted to properly terminate the packet. Changing the OPMODE[1:0] signals under all other
conditions (while the transceiver is transmitting or receiving data) will generate undefined results.
7.3
Test Mode Support
Table 7.4 USB2.0 Test Modes
USB3500 SETUP
USB2.0 TEST MODES
SE0_NAK
J
K
Test_Packet
OPERATIONAL MODE
State 0
State 2
State 2
State 0
LINK TRANSMITTED
DATA
No transmit
All '1's
All '0's
Test Packet data
Revision 1.0 (04-04-05)
32
DATASHEET
XCVRSELECT &
TERMSELECT
HS
HS
HS
HS
SMSC USB3500