TCI6636K2H Datasheet, PDF (261/362 Pages) Texas Instruments – Multicore DSP+ARM KeyStone II System-on-Chip (SoC)

TCI6636K2H
Multicore DSP+ARM KeyStone II System-on-Chip (SoC)
SPRS835F—October 2013
Figure 8-40 USB_PHY_CTL2 Register
31
30
29
27
Reserved
PHY_PC_LOS_BIAS
R-0
R/W-101
26
23
PHY_PC_TXVREFTUNE
R/W-1000
22
21
PHY_PC_TXRISETUNE
R/W-01
20
19
18
17
16
15
14
PHY_PC_TXRESTUNE
PHY_PC_TXPREEMPPULSETUNE
PHY_PC_TXPREEMPAMPTUNE
PHY_PC_TXHSXVTUNE
R/W-01
R/W-0
R/W-00
R/W-11
13
10
9
7
PHY_PC_TXFSLSTUNE
PHY_PC_SQRXTUNE
R/W-0011
R/W-011
Legend: R = Read only; R/W = Read/Write, -n = value after reset
6
4
PHY_PC_OTGTUNE
R/W-100
3
Reserved
R-0
2
0
PHY_PC_COMPDISTUNE
R/W-100
Table 8-58 USB_PHY_CTL2 Register Field Descriptions (Part 1 of 2)
Bit
31-30
29-27
Field
Reserved
PHY_PC_LOS_BIAS
26-23 PHY_PC_TXVREFTUNE
22-21 PHY_PC_TXRISETUNE
20-19 PHY_PC_TXRESTUNE
18
PHY_PC_TXPREEMPPULSETUNE
17-16 PHY_PC_TXPREEMPAMPTUNE
Description
Reserved
Loss-of-Signal Detector Threshold Level Control.
Sets the LOS detection threshold level.
+1 = results in a +15 mVp incremental change in the LOS threshold.
-1 = results in a -15 mVp incremental change in the LOS threshold.
Note: the 000b setting is reserved and must not be used.
HS DC Voltage Level Adjustment.
Adjusts the high-speed DC level voltage.
+1 = results in a +1.25% incremental change in high-speed DC voltage level.
-1 = results in a -1.25% incremental change in high-speed DC voltage level.
HS Transmitter Rise/Fall TIme Adjustment.
Adjusts the rise/fall times of the high-speed waveform.
+1 = results in a -4% incremental change in the HS rise/fall time.
-1 = results in a +4% incremental change in the HS rise/fall time.
USB Source Impedance Adjustment.
Some applications require additional devices to be added on the USB, such as a series switch, which
can add significant series resistance. This bus adjusts the driver source impedance to compensate for
added series resistance on the USB.
HS Transmitter Pre-Emphasis Duration Control.
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.
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 μA 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.
Copyright 2013 Texas Instruments Incorporated
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