
Universal Serial Bus Interface – On-The-Go Module
21-38
Freescale Semiconductor
21.3.3.16 USB Mode Register (USBMODE)
This register is not defined in the EHCI specification. It controls the operating mode of the module.
1
VC
VBUS charge. Setting this bit causes the VBUS line to charge. This is used for VBus pulsing during SRP.
0
VD
VBUS discharge. Setting this bit causes VBUS to discharge through a resistor.
Address: 0xFC0B_01A8 (USBMODE)
Access: User read/write
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
0
0
0
0
0
SDIS SLOM
ES
CM
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 21-30. USB Mode Register (USBMODE)
Table 21-33. USBMODE Field Descriptions
Field
Description
31–5
Reserved, must be cleared.
4
SDIS
Stream disable.
0 Inactive.
1 Active.
Host mode (USB host and USB OTG):
Setting this bit ensures that overruns/underruns of the latency FIFO are eliminated for low bandwidth systems
where the RX and TX buffers are sufficient to contain the entire packet. Enabling stream disable also has the
effect of ensuring the TX latency fills to capacity before the packet launches onto the USB.
Time duration to pre-fill the FIFO becomes significant when stream disable is active. See TXFILLTUNING to
characterize the adjustments needed for the scheduler when using this feature.
Also, in systems with high system bus utilization, setting this bit ensures no overruns or underruns during
operation at the expense of link utilization. SDIS can be left clear and the rules under the description of the
TXFILLTUNING register can limit underruns/overruns for those who desire optimal link performance.
Device mode (USB OTG only):
Setting this bit disables double priming on RX and TX for low bandwidth systems. This mode ensures that when
the RX and TX buffers are sufficient to contain an entire packet that the standard double buffering scheme is
disabled to prevent overruns/underruns in bandwidth limited systems.
In high-speed mode, all packets received are responded to with a NYET handshake when stream disable is
active.
3
SLOM
Setup lockout mode. For the module in device mode, this bit controls behavior of the setup lock mechanism. See
Section 21.5.3.4.4, “Control Endpoint Operation.”
0 Setup lockouts on.
1 Setup lockouts off (software requires use of the USBCMD[SUTW] bit).
Table 21-32. OTGSC Field Descriptions (continued)
Field
Description
MCF5329 Reference Manual, Rev 3
Содержание MCF5329
Страница 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
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Страница 564: ...Liquid Crystal Display Controller LCDC 22 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 692: ...Programmable Interrupt Timers PIT0 PIT3 28 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 720: ...Queued Serial Peripheral Interface QSPI 30 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
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Страница 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
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