Preliminary
Registers
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20.9.2.1.21 USB0 MGC UTMI Loopback Register (USB0UTMILB)
The USB0 MGC UTMI loopback register (USB0UTMILB) contains most of the input and output UTMI
signals for the Mentor Graphics Controller. The UTMI interface is located between the PHY module and
the Mentor Graphics Controller.
In the loopback mode test register bits 11 to 0 control various UTMI signals that are input to the Mentor
Graphics Controller.
In the loopback mode test register bits 28 to 16 observe various UTMI signals that are output from the
Mentor Graphics Controller.
The USB0 MGC UTMI loopback register is shown in
and described in
.
Figure 20-85. USB0 MGC UTMI Loopback Register (USB0UTMILB)
31
29
28
27
26
25
24
Reserved
suspendm
suspendm
txvalid
xcvrsel
R-0h
R-0h
R-0h
R-0h
R-0h
23
22
21
20
19
18
17
16
xcvrsel
termsel
drvvbus
chrgvbus
dischrgvbus
dppulldown
dmpulldown
idpullup
R-0h
R-0h
R-0h
R-0h
R-0h
R-0h
R-0h
R-0h
15
12
11
10
9
8
Reserved
iddig
hostdiscon
sessend
avalid
R-0h
R/W-0
R/W-0
R/W-0
R/W-0
7
6
5
4
3
2
1
0
vbusvalid
rxerror
Reserved
linestate
Reserved
R/W-0
R/W-0
R-0h
R/W-1h
R-0h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 20-96. USB0 MGC UTMI Loopback Register (USB0UTMILB) Field Descriptions
Bits
Field
Description
31-29
Reserved
Always read as 0. Writes have no effect.
28
suspendm
Loopback test observed value for suspendm
27-26
opmode
Loopback test observed value for opmode
25
txvalid
Loopback test observed value for txvalid
24-23
xcvrsel
Loopback test observed value for xcvrsel
22
termsel
Loopback test observed value for termsel
21
drvvbus
Loopback test observed value for drvvbus
20
chrgvbus
Loopback test observed value for chrgvbus
19
dischrgvbus
Loopback test observed value for dischrgvbus
18
dppulldown
Loopback test observed value for dppulldown
17
dmpulldown
Loopback test observed value for dmpulldown
16
idpullup
Loopback test observed value for idpullup
15-12
Reserved
Always read as 0. Writes have no effect.
11
iddig
Loopback test value for iddig
10
hostdiscon
Loopback test value for hostdiscon
9
sessend
Loopback test value for sessend
8
avalid
Loopback test value for avalid
7
vbusvalid
Loopback test value for vbusvalid
6
rxerror
Loopback test value for rxerror
5-4
Reserved
Always read as 0. Writes have no effect.
3-2
linestate
Loopback test value for linestate
1-0
Reserved
Always read as 0. Writes have no effect.
1884Universal Serial Bus (USB)
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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