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參數(shù)資料
| 型號(hào)： | E-1110 |
| 英文描述： | E-1110 10/100/1000 Mbits/s Ethernet MAC preliminary technical manual 4/01 |
| 中文描述： | 電子1110 10/100/1000 Mbits /秒以太網(wǎng)MAC初步的技術(shù)手冊(cè)4 / 01 |
| 文件頁(yè)數(shù)： | 77/108頁(yè) |
| 文件大小： | 577K |
| 代理商： | E-1110 |
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3-32
Signals
The signals in E110_TSV[30:0] have the following
functions:
TSV30
Transmit canceled because of excess deferral.
Excess deferrals occur when the network is
constantly busy (greater than 24,288 bit times
when the host HUGE_PKT_EN signal is
deasserted or greater than 524,288 bit times
when HUGE_PKT_EN is asserted).
TSV29
Transmit dropped because of late collision. A late
collision is one that occurs greater than 512 bit
times into packet transmission.
TSV28
Transmit dropped because of excessive collisions
(15 transmit retries).
TSV27
Transmit aborted because of underrun. If the host
is unable to supply transmit packet data bytes in
a timely manner to the E-110 core an underrun
condition exists.
TSV26
Transmit aborted because of excessive length.
The transmission is aborted if the packet exceeds
1518 bytes with the host HUGE_PKT_EN signal
LOW, or 32 Kbytes with the HUGE_PKT_EN
signal HIGH.
TSV25
Packet transmitted successfully.
TSV24
Packet deferred on transmission attempt. A packet
is deferred when the network is busy.
TSV23
Broadcast packet transmitted or attempted.
TSV22
Multicast packet transmitted or attempted.
TSV21
FCS error seen on transmission attempt. When
the host deasserts E110_CRCEN, indicating that
the host provides the FCS eld in transmitted
packets, the MAC veries the host FCS against its
internally computed FCS. The E-110 core asserts
the TSV21 signal to indicate a mismatch in the
two FCSs. If the host asserts the E110_CRCEN
signal, the MAC both calculates and provides the
FCS in transmitted packets. In this case, the MAC
does not assert the TSV21 signal.
TSV20
Late collision (a collision that occurs more than
512 bits times into the packet) seen on
transmission attempt.
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