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4.78 OTG Device Control Register (DEVCTL)
The OTG Device Control Register (DEVCTL) is shown in Figure 93 and described in Table 94.
Figure 93. OTG Device Control Register (DEVCTL)
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
BDEVICE | FSDEV | LSDEV | VBUS |
| HOSTMODE | HOSTREQ | SESSION |
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LEGEND: R/W = Read/Write; R = Read only;
Table 94. OTG Device Control Register (DEVCTL) Field Descriptions
Bit | Field | Value | Description |
7 | BDEVICE |
| This |
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| device. |
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| 0 | 'A' device |
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| 1 | 'B' device |
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| Only valid while a session is in progress. |
6 | FSDEV | This | |
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| to the port |
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| when the device is reset). Only valid in Host mode. |
5 | LSDEV | This | |
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| Only valid in Host mode. |
VBUS | These | ||
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| 0 | Below Session End |
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| 1h | Above Session End, below AValid |
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| 2h | Above AValid, below VBusValid |
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| 3h | Above VBusValid |
2 | HOSTMODE | This | |
1 | HOSTREQ | When set, the USB controller will initiate the Host Negotiation when Suspend mode is entered. It is | |
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| cleared when Host Negotiation is completed. ('B' device only) |
0 | SESSION | When operating as an 'A' device, you must set or clear this bit start or end a session. When | |
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| operating as a 'B' device, this bit is set/cleared by the USB controller when a session starts/ends. |
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| You must also set this bit to initiate the Session Request Protocol. When the USB controller is in |
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| Suspend mode, you may clear the bit to perform a software disconnect. |
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| A special software routine is required to perform SRP. Details will be made available in a later |
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| document version. |
Universal Serial Bus (USB) Controller | 137 | |
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