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USB3318C-CP-TR

Hi-Speed USB Transceiver with 1.8V-3.3V ULPI Interface - 13MHz Reference Clock

Microchip Technology 

Hi-Speed USB Transceiver with 1.8V-3.3V ULPI Interface - 13MHz Reference Clock

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 USB3318 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 USB3318 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 USB3318 also includes two 125kΩ DP and DM pull-up resistors described in Section 5.8.

Table 5.1 DP/DM Termination vs. Signaling Mode

ULPI REGISTER SETTINGS

USB3318 TERMINATION

RESISTOR SETTINGS

SIGNALING MODE

General Settings

Tri-State Drivers

Power-up or Vbus < VSESSEND

Host Settings

Host Chirp

Host Hi-Speed

Host Full Speed

Host HS/FS Suspend

Host HS/FS Resume

SMSC USB3318 REV C

XXb Xb 01b Xb Xb 0b 0b 0b 0b 0b

01b 0b 00b 1b 1b 0b 0b 1b 1b 0b

00b 0b 10b 1b 1b 0b 0b 1b 1b 1b

00b 0b 00b 1b 1b 0b 0b 1b 1b 1b

X1b 1b 00b 1b 1b 0b 0b 1b 1b 0b

01b 1b 00b 1b 1b 0b 0b 1b 1b 0b

01b 1b 10b 1b 1b 0b 0b 1b 1b 0b

21

DATASHEET

Revision 2.1 (06-02-10)

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