66AK2L06
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SPRS930 –APRIL 2015
Table 9-67. USB_PHY_CTL2 Register Field Descriptions (continued)
Bit Field Description
18 PHY_PC_ HS Transmitter Pre-Emphasis Duration Control.
TXPREEMPPULSETUNE
Controls the duration for which the HS pre-emphasis current is sourced onto DP or DM. It is
defined in terms of unit amounts. One unit of pre-emphasis duration is approximately 580 ps
and is defined as 1x pre-emphasis duration. This signal valid only if either
txpreempamptune[1] or txpreempamptune[0] is set to 1.
• 1 = 1x, short pre-emphasis current duration.
• 0 = 2x, long pre-emphasis current duration.
17-16 PHY_PC_TXPREEMPAMPTUNE HS Transmitter Pre-Emphasis Current Control.
Controls the amount of current sourced to DP and DM after a J-to-K or K-to-J transition.
The HS Transmitter pre-emphasis current is defined in terms of unit amounts. One unit
amount is approximately 600 µ;A and is defined as 1x pre-emphasis current.
• 11 = 3x pre-emphasis current.
• 10 = 2x pre-emphasis current.
• 01 = 1x pre-emphasis current.
• 00 = HS Transmitter pre-emphasis is disabled.
15-14 PHY_PC_TXHSXVTUNE Transmitter High-Speed Crossover Adjustment.
Adjusts the voltage at which the DP and DM signals cross while transmitting in HS mode.
• 11 = Default setting.
• 10 = +15 mV
• 01 = -15 mV
• 00 = Reserved
13-10 PHY_PC_TXFSLSTUNE FS/LS Source Impedance Adjustment.
Adjusts the low- and full-speed single-ended source impedance while driving high.
This parameter control is encoded in thermometer code.
• +1 = results in a -2.5% incremental change in threshold voltage level.
• -1 = results in a +2.5% incremental change in threshold voltage level.
Any non-thermometer code setting (that is 1001) is not supported and reserved.
9-7 PHY_PC_SQRXTUNE Squelch Threshold Adjustment.
Adjusts the voltage level for the threshold used to detect valid high-speed data.
• +1 = results in a -5% incremental change in threshold voltage level.
• -1 = results in a +5% incremental change in threshold voltage level.
6-4 PHY_PC_OTGTUNE VBUS Valid Threshold Adjustment.
Adjusts the voltage level for the VBUS valid threshold.
• +1 = results in a +1.5% incremental change in threshold voltage level.
• -1 = results in a -1.5% incremental change in threshold voltage level.
3 Reserved Reserved
2-0 PHY_PC_COMPDISTUNE Disconnect Threshold Adjustment.
Adjusts the voltage level for the threshold used to detect a disconnect event at the host.
• +1 = results in a +1.5% incremental change in the threshold voltage level.
• -1 = results in a -1.5% incremental change in the threshold voltage level.
Figure 9-53. USB_PHY_CTL3 Register
31 30 29 23
Reserved PHY_PC_PCS_TX_SWING_FULL
R-0 R/W-1111000
22 17 16 11 10 5 4 0
PHY_PC_PCS_TX_DEEMPH_6DB Reserved PHY_PC_PCS_TX_DEEMPH_3P5DB PHY_PC_LOS_LEVEL
R/W-100000 R-0 R/W-010101 R/W-01001
Legend: R = Read only; R/W = Read/Write, -n = value after reset
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