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参数资料
| 型号： | SPEAR-07-NC03 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 1 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PBGA180 |
| 封装： | LEAD FREE, 12 X 12 MM, 1.70 MM HEIGHT, LFBGA-180 |
| 文件页数： | 164/194页 |
| 文件大小： | 1987K |
| 代理商： | SPEAR-07-NC03 |
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6 Blocks description
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6.3.4.3 USBSUSPEND
In this state, the Host Controller is not generating SOF tokens on the USB; nor is it processing
any lists that may be enabled in the HcControl register. In fact, the Host Controller ignores most
of the operational registers which need not contain any meaningful values; however, the Host
Controller does preserve their values. While in this state, the Host Controller monitors the USB
for resume signalling, and if detected, changes the state to USBRESUME. Because of this,
there is a restriction on how the Host Controller Driver may modify the contents of HcControl
while in the USBSUSPEND state: Host Controller Driver may only write to HcControl with the
HostControllerFunctionalState
field set to either USBRESET or USBRESUME (see
exception).
OpenHCI - Open Host Controller Interface Specification for USB
After a certain length of time without SOF tokens, devices on the USB enter the suspend state.
Normally, the Host Controller Driver must ensure that the Host Controller stays in this state for
at least 5 ms and then exits this state to either the USBRESUME or the USBRESET state. An
exception is when this state is entered due to a software reset and the previous state was not
USBSUSPEND, in which case, if the Host Controller remains in the USBSUSPEND state for
less than 1 ms, it may exit directly to USBOPERATIONAL (the timing of less than 1 ms ensures
that no device on USB attempts to initiate resume signalling and thus the Host Controller does
not attempt to modify HcControl). The only interrupts possible in the USBSUSPEND state are
ResumeDetected
(the Host Controller will have changed the HostControllerFunctionalState
to the USBRESUME state) and OwnershipChange.
6.3.4.4 USBRESUME
While the Host Controller is in the USBRESUME state, it is asserting resume signalling on the
USB; as a result, no tokens are generated and the Host Controller does not process any lists
that may be enabled in the HcControl register. In fact, most of the operational registers are
ignored and need not contain any meaningful values; however, the Host Controller does
preserve their values. This state must be maintained for the minimum time specified in the USB
Specification for the assertion of resume on the USB. The only interrupt possible in the
USBRESUME state is OwnershipChange.
For more details please refer to the OpenHCI Interface Specification for USB in Chapter 8)
Reference Documents
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