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: 163/194页
文件大小: 1987K
代理商: SPEAR-07-NC03
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6 Blocks description
SPEAR-07-NC03
The HcHCCA is filled in by software and points the Host Controller at the block of shared RAM
called the Host Controller Communication Area (HCCA). All fields within the HCCA start with
the prefix Hcca.
6.3.3
Initialization of the HCI
There are a number of steps necessary for an OS to bring its Host Controller Driver to an
operational state:
Load Host Controller Driver and locate the HC
Verify the HC and allocate system resources
Take control of HC (support for an optional System Management Mode driver)
Set up HC registers and HC Communications Area
Begin sending SOF tokens on the USB
Note:
Due to some devices on the USB that may take a long time to reset, it is desirable that the Host
Controller Driver start-up process not transition to the USBRESET state if at all possible.
6.3.4
Operational States
The operational states of the Host Controller are defined by their effect on the USB:
USBOPERATIONAL
USBRESET
USBRESUME
USBSUSPEND
6.3.4.1 USBRESET
When the Host Controller enters this state, most of the operational registers are ignored by the
Host Controller and need not contain any meaningful values; however, the contents of the
registers (except Root Hub registers) are preserved by the HC. The obvious exception is that
the Host Controller uses the HcControl register which contains the
HostControllerFunctionalState
.
While in this state, the Root Hub is being reset, which causes the Root Hub's downstream ports
to be reset and possibly powered off. This state must be maintained for the minimum time
specified in the USB Specification for the assertion of reset on the USB. Only the following
interrupts are possible while the Host Controller is in the USBRESET state:
OwnershipChange
.
6.3.4.2 USBOPERATIONAL
This is the normal state of the HC. In this state, the Host Controller is generating SOF tokens on
the USB and processing the various lists that are enabled in the HcControl register. This allows
the clients of the Host Controller Driver, USBD and above, to communicate with devices on the
USB. The Host Controller generates the first SOF token within one ms of the time that the
USBOPERATIONAL state is entered (if the Host Controller Driver wants to know when this
occurs, it may enable the StartOfFrame interrupt). All interrupts are possible in the
USBOPERATIONAL state, except ResumeDetected.
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