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參數(shù)資料
| 型號： | IXF440 |
| 英文描述： | LAN HUB CONTROLLER |
| 中文描述： | 局域網(wǎng)集線器控制器 |
| 文件頁數(shù)： | 67/100頁 |
| 文件大小： | 1354K |
| 代理商： | IXF440 |
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IXF440 Multiport 10/100 Mbps Ethernet Controller
Datasheet
67
After detecting receive activity on the line, the IXF440 starts to process the preamble bytes.
6.5.2
Preamble Processing
The IEEE 802.3 Standard allows a maximum size of 56 bits (7 bytes) for the preamble, while the
IXF440 allows any arbitrary preamble length. The IXF440 checks for the start frame delimiter (SFD)
byte. If the IXF440 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
IXF440 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 IXF440 continues to monitor the line condition.
In the MII mode, the IXF440 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 IXF440 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 IXF440 determines the status of the received frame and loads the
status into the receive FIFO. The IXF440 can report the following events at the end of frame
reception:
Overflow
The IXF440 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
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