USB3290 datasheet(29/46 Pages) SMSC

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Small Footprint Hi-Speed USB 2.0 Device PHY with UTMI Interface

Datasheet

SMSC USB3290

Revision 1.5 (11-02-07)

DATASHEET

8.2

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 (state 2), OPMODES are set, and then 5 60MHz clocks later,

TXVALID is asserted. In this case, the SYNC and EOP patterns are not transmitted.

The only exception to this is when OPMODE[1:0] is set to state 2 while TXVALID has been asserted

(the transceiver is transmitting a packet), in order to flag a transmission error.

In this case, the

USB3290 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.

Under no circumstances should the device controller change OPMODE while the DP/DM lines are still

transmitting or unpredictable changes on DP/DM are likely to occur.

The same applies for

TERMSELECT and XCVRSELECT.

8.3

Test Mode Support

Table 8.2 Operational Modes

MODE[1:0]

STATE#

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 8.3 USB 2.0 Test Modes

USB 2.0 TEST MODES

USB3290 SETUP

OPERATIONAL MODE

SIE 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

USB3290 Datasheet(PDF) 29 Page - SMSC Corporation

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