參數資料
型號: E-110
廠商: LSI Corporation
英文描述: 100BASE-T Fast Ethernet Core(100BASE-T快速以太網處理芯片 Fast Ethernet Core)
中文描述: 100兆- T的快速以太網核心(100兆- T的快速以太網處理芯片快速以太網核心)
文件頁數: 57/130頁
文件大小: 770K
代理商: E-110
MAC Core Signals
2-25
and SNMP specifications. The MAC provides basic per
packet information that can be collected by an application
built on top of the MAC. The collected information can
then be used for RMON and SNMP.
The signals in TSV[30:0] have the following functions:
TSV30
Transmit canceled because of excess deferral.
Excess deferrals occur when the network is con-
stantly busy (greater than 24,288 bit times when
HUGEN is deasserted or greater than 524,288 bit
times when HUGEN 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 HUGEN signal LOW, or
32 Kbytes with the HUGEN 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 CRCEN, indicating that the
host provides the FCS field in transmitted packets,
the MAC verifies the host FCS against its inter-
nally computed FCS. The E-110 core asserts the
TSV21 signal to indicate a mismatch in the two
FCSs. If the host asserts the 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 transmis-
sion attempt.
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