參數(shù)資料
型號(hào)： ML60851EGA
廠商： OKI ELECTRIC INDUSTRY CO LTD
元件分類： 總線控制器
英文描述： UNIVERSAL SERIAL BUS CONTROLLER, PQFP44
封裝： 0.80 MM PITCH, PLASTIC, QFP-44
文件頁(yè)數(shù)： 73/88頁(yè)
文件大?。?/td> 1137K
代理商： ML60851EGA
Oki Semiconductor
ML60851E
73/84
Control transfer
(a) Setup stage
The setup token and 8 bytes of setup data are transmitted from the host. The ML60851E decodes the setup
token, and automatically stores the 8 bytes of setup data in the setup registers. When this is completed
normally, the ML60851E returns an ACK to the host.
The 8-byte setup data is the standard request code defined in Section 9.3 of the USB Standards, or a code of
the requests unique to each device class, etc. The request is decoded on the local MCU side.
(b) Data stage
If the request specified by the 8-byte setup data is also accompanied by transfer of parameter data from the
host to the device, the transfer is a control write transfer, and the OUT token and the data packet are
transmitted from the host. When these are received normally, the ML60851E stores the parameter data in the
EP0 receive FIFO and returns ACK to the host.
If the request is accompanied by transfer of parameter data from the device to the host, the transfer is a control
read transfer, and when the host sends the IN token, the ML60851E sends the parameter data that was already
stored beforehand in the EP0 transmit FIFO by the local MCU. When the host receives this normally, it
returns an ACK to the ML60851E.
On the other hand, in the case of requests that do not contain any parameter data that need to be transmitted or
received, this data stage will not be present and the processing proceeds directly to the status stage from the
setup stage.
(c) Status stage
The status stage is a stage intended for reporting the status of the result of executing a request from the device
to the host. During a control write transfer or a control transfer without data, the IN token is sent by the host,
and the ML60851E returns a response to it. During a control read transfer, the OUT token and data of zero
length are sent by the host, and the ML60851E returns a response to it.
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