USB3329C-GL-TR Datasheet, PDF (22/79 Pages) Microchip Technology – Industry’s Smallest Hi-Speed USB Transceiver with 1.8V ULPI Interface

Industry’s Smallest Hi-Speed USB Transceiver with 1.8V ULPI Interface
Datasheet
interpreted as data. The RX block also includes a single-ended receiver on each of the data lines to
determine the correct FS linestate.
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 USB332x 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 USB332x 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 USB332x also includes two DP and DM pull-up resistors described in Section 5.8.
Table 5.1 DP/DM Termination vs. Signaling Mode
ULPI REGISTER SETTINGS
USB332X TERMINATION
RESISTOR SETTINGS
SIGNALING MODE
General Settings
Tri-State Drivers
Power-up or VBUS < V_SESSEND
Host Settings
Host Chirp
Host Hi-Speed
Host Full Speed
Revision 1.1 (11-20-12)
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
22
DATASHEET
SMSC USB332x