USB3500 datasheet(32/46 Pages) SMSC

32 / 46 page

Hi-Speed USB Host, Device or OTG PHY With UTMI+ Interface

Datasheet

Revision 1.0 (04-04-05)

SMSC USB3500

DATASHEET

7.2

OPMODES

The OPMODE[1:0] pins allow control of the operating modes.

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

LS-J

FS-K

Invalid

!Squelch &

!HS Differential

Receiver Output

SE1

Invalid

Table 7.3 Operational Modes

MODE[1:0]

STATE NAME

DESCRIPTION

Normal Operation

Transceiver operates with normal USB data encoding and decoding

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

Disable Bit Stuffing

and NRZI encoding

Disables bitstuffing and NRZI encoding logic so that 1's loaded from the

DATA bus become 'J's on the DP/DM and 0's become 'K's

Reserved

N/A

Table 7.4 USB2.0 Test Modes

USB2.0 TEST MODES

USB3500 SETUP

OPERATIONAL MODE

LINK TRANSMITTED

DATA

XCVRSELECT &

TERMSELECT

SE0_NAK

State 0

No transmit

State 2

All '1's

State 2

All '0's

Test_Packet

State 0

Test Packet data

Table 7.2 Host Linestate States (DPPD & DMPD = 1) (continued)

STATE OF DP/DM LINES

LINESTATE[1:0]

LOW SPEED

XCVRSEL[1:0]=10

TERMSELECT=1

FULL SPEED

XCVRSEL[1:0]=01

TERMSELECT=1

HIGH SPEED

XCVRSEL[1:0]=00

TERMSELECT=0

OPMODE=00/01

CHIRP MODE

XCVRSEL[1:0]=00

TERMSELECT=0

OPMODE=10

LS[1]

LS[0]

USB3500 Datasheet(PDF) 32 Page - SMSC Corporation

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