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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)： | 46/109頁 |
| 文件大?。?/td> | 815K |
| 代理商： | L64381 |
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3-6
Signal Descriptions
Two cases need to be considered when ABORT_IN is
asserted while either writing into the Transmit FIFO or
reading from the Receive FIFO:
While writing into the Transmit FIFO, if the L64381
detects the assertion of ABORT_IN, then the L64381
ignores that bus transfer and restores the internal
Transmit FIFO tail pointer to the value it contained
before the current bus transfer began.
While reading from the Receive FIFO, if the L64381
detects the assertion of ABORT_IN, then it stops the
current transfer and restores the Receive FIFO head
pointer to the value it contained just before the trans-
fer was started. On the bus side, the L64381 drives
all zeros on the data bus and negates the
BYTE_VALID{3:0], SOP, and EOP signals for the rest
of the bus transfer.
If ABORT_IN is asserted after the assertion of EOP on
the current bus transfer, the L64381 ignores it. The
PORT_NO inputs determine which port is selected.
ABORT_OUT Abort Out
Output
The L64381 asserts ABORT_OUT upon detection of a
failing condition for either a Transmit or a Receive opera-
tion. For a Receive operation, the L64381 asserts
ABORT_OUT only if EOP is asserted during a packet
read operation. A packet read operation can be a
Runt/Jabber packet, a packet with bad FCS, an internal
PLL error, or a receive FIFO overrun error. When a failing
condition occurs on a receiving port, the L64381 reads
the last received byte (or bytes) from that port through the
Bus Interface, and asserts ABORT_OUT and EOP to sig-
nal the corrupted packet. If necessary, the L64381 also
updates all associated Statistics Counters.
A receive FIFO overrun error may destroy a portion of the
packet and can occur for one of two reasons:
The first error occurs when a long packet is overrun
in the middle of the packet (only some data is miss-
ing). The L64381 asserts ABORT_OUT when the last
byte (or bytes) of the current packet is read.
The second error occurs when two packets arrive
from the network: packet A arrives first, and packet B
follows. Because of a receive FIFO overrun condition,
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