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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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USB3343 Datenblatt(PDF) 26 Page - Microchip Technology |
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USB3343 Datenblatt(HTML) 26 Page - Microchip Technology |
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26 / 92 page  USB334x DS00002646A-page 26 2009-2018 Microchip Technology Inc. 5.2.2 TERMINATION RESISTORS The USB334x 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 transceiver 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 of the termination resistors. All possible valid resistor combinations are shown in Table 5-1, and operation is supported 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 maintained 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 TABLE 5-1: DP/DM TERMINATION VS. SIGNALING MODE Signaling Mode ULPI Register Settings USB334x Termination Resistor Settings General Settings Tri-State Drivers, Note 5-1 XXb Xb 01b Xb Xb 0b0b0b0b0b Power-up or VBUS < VSESSEND 01b 0b 00b1b 1b 0b0b1b1b0b Host Settings Host Chirp 00b 0b 10b1b 1b 0b0b1b1b1b Host High Speed 00b 0b 00b1b 1b 0b0b1b1b1b Host Full Speed X1b 1b 00b 1b 1b 0b 0b 1b 1b 0b Host HS/FS Suspend 01b 1b 00b1b 1b 0b0b1b1b0b Host HS/FS Resume 01b 1b 10b1b 1b 0b0b1b1b0b Host Low Speed 10b 1b 00b 1b 1b 0b 0b 1b 1b 0b Host LS Suspend 10b 1b 00b 1b 1b 0b 0b 1b 1b 0b Host LS Resume 10b 1b 10b1b 1b 0b0b1b1b0b Host Test J/Test_K 00b 0b 10b1b 1b 0b0b1b1b1b Peripheral Settings Peripheral Chirp 00b 1b 10b 0b 0b 1b 0b 0b 0b 0b Peripheral HS 00b 0b 00b 0b 0b 0b 0b 0b 0b 1b Peripheral FS 01b 1b 00b 0b 0b 1b 0b 0b 0b 0b |
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