參數(shù)資料
型號： 21440
廠商： Intel Corp.
英文描述： Multiport 10/100Mb/s Ethernet Controller(多端口10/100Mb/s 以太網(wǎng)控制器)
中文描述： 多端口10/100Mb/s以太網(wǎng)控制器（多端口支持10/100Mbps以太網(wǎng)控制器）
文件頁數(shù)： 64/92頁
文件大?。?/td> 1352K
代理商： 21440
21440 Multiport 10/100Mb/s Ethernet Controller
6-7
Network Interface Operation
6.5.2
Preamble Processing
The IEEE 802.3 Standard allows a maximum size of 56 bits (7 bytes) for the preamble, while the
21440 allows any arbitrary preamble length. The 21440 checks for the start frame delimiter (SFD)
byte. If the 21440 receives a binary 11 before receiving 6 bits or a binary 00 anywhere while checking
for SFD, the reception of the current frame is aborted. The frame is not received, and the 21440 waits
until the network activity stops before monitoring the network activity for a new preamble.
The interpacket gap (IPG) between received frames should be at least 32-bit times.
6.5.3
Frame Decapsulation
While the frame is being assembled, the 21440 continues to monitor the line condition.
In the MII mode, the 21440 detects the end of frame when the data valid signal (dv{i}) deasserts.
Reception terminates with a frame error if the frame is not a valid MAC frame, or if an MII error
was detected during frame reception.
In the MII mode, an MII error is detected when the receive error signal (rerr{i}) asserts during
frame reception.
The 21440 refers to the last 4 full bytes received as the CRC. It checks the CRC bytes of all
received frames and reports all errors. Only whole bytes are run through the CRC check.
6.5.4
Terminating Reception
When reception terminates, the 21440 determines the status of the received frame and loads the status
into the receive FIFO. The 21440 can report the following events at the end of frame reception:
Overflow
The 21440 receive FIFO is not emptied as rapidly as it is filled, and an error occurs as frame data
is lost. If the FIFO is already full when a new frame is received, it will not be loaded in the FIFO.
CRC error
The 32-bit CRC, transmitted with the frame, did not match the CRC calculated upon reception.
Alignment error
The frame did not end on a byte boundary, but with a spare nibble (4 bits), and a CRC error has
also occurred. If the frame was not composed of an integral number of bytes, but the CRC was
okay, the frame is considered good and no error is reported.
MII error
An MII error was detected during frame reception.
Frame too short
A frame containing less than 64 bytes was received (including CRC).
Frame too long
A frame containing more than the programmed maximum size was received.
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