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參數(shù)資料
| 型號： | L64381 |
| 廠商： | LSI Corporation |
| 英文描述： | 4-Port Ethernet Controller(四端口以太網(wǎng)控制器) |
| 中文描述： | 4端口以太網(wǎng)控制器（四端口以太網(wǎng)控制器） |
| 文件頁數(shù)： | 47/109頁 |
| 文件大?。?/td> | 815K |
| 代理商： | L64381 |
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Bus Interface Signals
3-7
the L64381 drops the last several bytes of packet A
(no EOP signal for packet A) before it receives packet
B. Even if the L64381 successfully receives all of
packet B without an error, it asserts ABORT_OUT
with EOP for packet B.
For a Transmit operation, the L64381 may assert
ABORT_OUT anytime during a packet write operation for
one of many reasons:
L64381 detects a late collision
It detects excessive collisions
It detects a collision and S64 is set to 0 in the Packet
Configuration Register
It detects a transmit FIFO underrun error
It detects an invalid BYTE_VALID[3:0] combination
In any case, the L64381 asserts ABORT_OUT only dur-
ing a write attempt for the same packet to a port that has
just encountered an error. ABORT_OUT is asserted
when the first write operation after the failure occurs. The
L64381 ignores subsequent write bus transfers for the
same packet until it detects the start of a new packet. If
a nontransmit FIFO underrun error occurs during the last
write transfer of the packet, the L64381 does not assert
ABORT_OUT for the next new packet. The L64381 does
not assert ABORT_OUT for the current packet if that
packet ends within the FIFO. The L64381 simply flushes
the packet from the FIFO.
The L64381 requires three cycles after a write transfer to
send the transmit FIFO pointer values to the network.
The L64381 may detect a transmit FIFO underrun error
while a write transfer for the last portion of a packet is
occurring (with EOP asserted). The L64381 detects this
error within three cycles after it asserts EOP. If a new
write transfer starts on the same port within five cycles of
the previous write transfer, the L64381 asserts
ABORT_OUT.
The failing condition is one of the following:
L64381 detected a Receive FIFO overrun
Packet being received was a runt packet
Packet being received was an oversized packet
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