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參數(shù)資料
| 型號： | ML60851D |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | USB Device Controller |
| 中文描述： | USB設(shè)備控制器 |
| 文件頁數(shù)： | 74/82頁 |
| 文件大?。?/td> | 705K |
| 代理商： | ML60851D |
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FEDL60851D-01
1
Semiconductor
ML60851D
74/82
Packets and packet sizes
The ML60851D packs the transmit data into packets and unpacks (restores to the original form) the received data.
The packed data that is recognized by the software client is a set of data consisting of one or more packets, and this
is called an I/O request (IRP).
Among the several packets in an IRP, all the packets other than the last packet are transferred with the maximum
packet size. Only the last packet can be transferred as a "short packet", that is, a packet whose size is less than the
maximum packet size.
Packet
1
I/O Request Packet (IRP)
Maximum packet size
Packet
2
Packet
n-1
Packet
n
1 Packet
M Bytes
The ML60851D has payload registers corresponding to each end point, and it is possible to set the maximum
packet size for each end point in these registers. The maximum packet size should be within the capacity of the
corresponding FIFO, and can be set as follows:
(1) EP0 Receive packet size can be 8 bytes or less;
(2) EP0 Transmit packet size can be 8 bytes or less;
(3) EP1 Transmit/receive packet size can be 64 bytes or less;
(4) EP2 Transmit/receive packet size can be 64 bytes or less;
(5) EP3 Transmit packet size can be 8 bytes or less;
On the USB bus, the separation between successive packets is distinguished by appending a special signal
condition called EOP (End of Packet) at the end of each packet. The appending of EOP during transmission and
the detection and removal of EOP during reception are carried out by the ML60851D automatically.
(1) At the time of transmission, the packet is deemed to have ended when the local MCU has completed writing
the required number of bytes of data in the transmit FIFO and has then asserted the transmit ready status bit.
(The actual addition of EOP is executed at the time of transmitting the data over the USB bus after waiting for
the IN token from the host.) The packet will be a short packet if the transmit packet ready status bit is asserted
after writing data with less number of bytes than the maximum packet size. In particular, by asserting the
transmit packet ready status bit without writing any data, it is possible to form a null packet whose data length
is zero.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML60851E | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:USB Device Controller |
| ML60851EGA | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:USB Device Controller |
| ML60851ETB | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:USB Device Controller |
| ML60852 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:USB Device Controller |
| ML60852A | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:USB Device Controller |
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