USB3317C_V01 datasheet(21/76 Pages) SMSC

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Hi-Speed USB Transceiver with 1.8V-3.3V ULPI Interface - 26MHz Reference Clock

Datasheet

SMSC USB3317 REV C

Revision 2.1 (06-02-10)

DATASHEET

Data from the TX Logic block is encoded, bit stuffed, serialized and transmitted onto the USB cable

by the TX block. Separate differential FS/LS and HS transmitters are included to support all modes.

The USB3317 TX block meets the HS signalling level requirements in the USB 2.0 Specification when

the PCB traces from the DP and DM pins to the USB connector have very little loss. In some systems,

it may be desirable to compensate for loss by adjusting the HS transmitter amplitude. The Boost bits

in the HS TX Boost register may be configured to adjust the HS transmitter amplitude at the DP and

DM pins.

5.2.2

Termination Resistors

The USB3317 transceiver fully integrates all of the USB termination resistors on both DP and DM. This

includes 1.5kΩ pull-up resistors, 15kΩ pull-down resistors and the 45Ω high speed termination

resistors. These resistors require no tuning or trimming by the Link. The state of the resistors is

determined by the operating mode of the PHY when operating in synchronous mode.

The XcvrSelect[1:0], TermSelect and OpMode[1:0] bits in the Function Control register, and the

DpPulldown and DmPulldown bits in the OTG Control register control the configuration. The possible

valid resistor combinations are shown in Table 5.1, and operation is guaranteed in only the

configurations shown. If a ULPI Register Setting is configured that does not match a setting in the

table, the transceiver operation is not guaranteed and the settings in the last row of Table 5.1 will be

used.

RPU_DP_EN activates the 1.5kΩ DP pull-up resistor

RPU_DM_EN activates the 1.5kΩ DM pull-up resistor

RPD_DP_EN activates the 15kΩ DP pull-down resistor

RPD_DM_EN activates the 15kΩ DM pull-down resistor

HSTERM_EN activates the 45Ω DP and DM high speed termination resistors

The USB3317 also includes two 125kΩ DP and DM pull-up resistors described in Section 5.8.

Table 5.1 DP/DM Termination vs. Signaling Mode

SIGNALING MODE

ULPI REGISTER SETTINGS

USB3317 TERMINATION

RESISTOR SETTINGS

General Settings

Tri-State Drivers

XXb

01b

0b0b0b0b0b

Power-up or Vbus < VSESSEND

01b

00b1b

0b0b1b1b0b

Host Settings

Host Chirp

00b

10b1b

0b0b1b1b1b

Host Hi-Speed

00b

00b1b

0b0b1b1b1b

Host Full Speed

X1b

00b1b

0b0b1b1b0b

Host HS/FS Suspend

01b

00b1b

0b0b1b1b0b

Host HS/FS Resume

01b

10b1b

0b0b1b1b0b

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