參數(shù)資料
型號(hào)： ML60852
廠商： OKI SEMICONDUCTOR CO., LTD.
英文描述： USB Device Controller
中文描述： USB設(shè)備控制器
文件頁(yè)數(shù)： 16/81頁(yè)
文件大小： 451K
代理商： ML60852
PEDL60852-01
1
Semiconductor
ML60852
16/81
(6) Data packet transmission and reception procedure during isochronous transfer mode
Transfer of data is the major function in the isochronous transfermode. When carrying out isochronous transfer
between the ML60852 and the host, the following packet communications are carried out via the USB bus for the
data transfer of each packet.
(a) Token packet transfer (IN token or OUT token) from the host to the ML60852.
(b) Data packet transfer in the desired direction (from the host to the device or from the device to the host).
In the isochronous transfer mode, there is no handshaking that reports whether or not the packet transfer was
done normally.
The ML60852 requests the local MCU to send or receive packet data by asserting the
INTR
pin. The interrupt
cause is SOF. Upon receiving this interrupt, the local MCU writes the packet data into the transmit FIFO of the
EP set for transmission (ISO IN) in the isochronous transfer mode, or reads out data from the receive FIFO of
the EP set for reception (ISO OUT) in the isochronous transfer mode.
The above procedures of transferring one packet of data are explained below for transmission and reception
separately.
1)
During transmission
The EP for ISO IN has a two-layer FIFO configuration. One FIFO is used for storing the packet data that is
written in by the MCU via the local bus. The other FIFO is used for transmitting the stored data to the USB bus
when an IN token is received. The roles of the two FIFOs are interchanged when an SOF packet is received.
Upon receiving an SOF interrupt, the local MCU writes the data to be transmitted during the next frame into the
corresponding transmit FIFO of the EP of the ML60852. When the host transmits an IN token packet, the
ML60852 transmits to the host the packet data written in the transmit FIFO during one frame before the current
frame.
During reception
The EP for ISO OUT has a two-layer FIFO configuration. One FIFO is used for storing the packet data that is
output to the local bus when the MCU reads the received packet data. The other FIFO is used for storing the
packet data received from the USB bus. The roles of the two FIFOs are interchanged when an SOF packet is
received.
Upon receiving an SOF interrupt, the local MCU reads out the data that has been received during the previous
frame from the corresponding receive FIFO of the EP of the ML60852. When the host transmits an OUT token
and a data packet to the ML60852, the ML60852 stores that received data packet in the receive FIFO, and that
data packet is read out by the local MCU during the next frame.
2)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ML60852A 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:USB Device Controller
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