Texas Instruments AM335 Series Technical Reference Manual

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16.5.4.1 Termination_control Register (offset = 0h) [reset = 1000800h]
Termination_control is shown in Figure 16-134 and described in Table 16-145.
contains bits related to control of terminations in USB2PHY
Figure 16-134. Termination_control Register
31 30 29 28 27 26 25 24
Reserved ALWAYS_UPDATE RTERM_CAL_DONE FS_CODE_SEL
R/W-0h R/W-0h R-0h R/W-1h
23 22 21 20 19 18 17 16
Reserved USE_RTERM_RMX_ RTERM_RMX
REG
R/W-0h R/W-0h R/W-0h
15 14 13 12 11 10 9 8
RTERM_RMX HS_CODE_SEL RTERM_COMP_OUT RESTART_RTERM_C DISABLE_TEMP_TR
AL ACK
R/W-0h R/W-1h R-0h R/W-0h R/W-0h
7 6 5 4 3 2 1 0
USE_RTERM_CAL_R RTERM_CAL
EG
R/W-0h R/W-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 16-145. Termination_control Register Field Descriptions
Bit Field Type Reset Description
31-30 Reserved R/W 0h
29 ALWAYS_UPDATE R/W 0h
When set to 1 , the calibration code is updated immediately after a
code computation without waiting for idle periods.
28 RTERM_CAL_DONE R 0h Rterm calibration is done.
1st time cal is done this bit gets set and gets reset at a restart
cal.Read value is valid only if VDDLDO is on.
27-24 FS_CODE_SEL R/W 1h
FS Code selection control
23-22 Reserved R/W 0h
21 USE_RTERM_RMX_REG R/W 0h
Override termination resistor trim code with RTERM_RMX from this
register
20-14 RTERM_RMX R/W 0h When read, this field returns the current Termination resistor trim
code.Read value is valid only if VDDLDO is on.
The value written to this field is used as Termination resistor trim
code if bit 21 is set to 1
13-11 HS_CODE_SEL R/W 1h HS Code selection control.
Each increment increases the termination impedance by ~1.5%.
Valid values are 000b 011b.
10 RTERM_COMP_OUT R 0h Master loop comparator output.
Read value is valid only if VDDLDO is on.
9 RESTART_RTERM_CAL R/W 0h Restart the rterm calibration.
The calibration restarts on any toggle 0 to 1 or 1 to 0 on this bit.
8 DISABLE_TEMP_TRACK R/W 0h
Disables the temperature tracking function of the termination
calibration
7 USE_RTERM_CAL_REG R/W 0h
when '1' the rterm cal code is overridden by values in RTERM_CAL
6-0 RTERM_CAL R/W 0h When read this field returns the current rterm calibration code.
Read value is valid only if VDDLDO is on.
The value written to this field is used as rterm calibration code if the
bit USE_RTERM_CAL_REG is 1.
1903
SPRUH73H–October 2011–Revised April 2013 Universal Serial Bus (USB)
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Texas Instruments AM335 Series Specifications

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Brand	Texas Instruments
Model	AM335 Series
Category	Computer Hardware
Language	English