USB3250 datasheet(33/48 Pages) SMSC

33 / 48 page

USB2.0 PHY IC

Datasheet

SMSC GT3200, SMSC USB3250

Revision 1.5 (03-24-06)

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 PHY

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

8.4

SE0 Handling

For FS operation, IDLE is a J state on the bus. SE0 is used as part of the EOP or to indicate reset.

When asserted in an EOP, SE0 is never asserted for more than 2 bit times. The assertion of SE0 for

more than 2.5us is interpreted as a reset by the device operating in FS mode.

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 TXDATA bus become 'J's on the DP/DM

and 0's become 'K's

Reserved

N/A

Table 8.3 USB2.0 Test Mode to Macrocell Mapping

USB2.0 TEST MODES

PARTNUMBER SETUP

OPERATIONAL MODE

SIE TRANSMITTED

DATA

XCVRSELECT &

TERMSELECT

SE0_NAK

Normal

No transmit

Disable

All '1's

Disable

All '0's

Test_Packet

Normal

Test Packet data

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