參數(shù)資料
型號： LXT9883HC
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)： 80/96頁
文件大小： 1309K
代理商： LXT9883HC
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
80
Datasheet
Table 51. Port Counter Registers
Name
Offset
Addr
1
Description
Registers Used When Running at 10 or 100 Mbps
rptrMonitorPortReadableFrames
0X0
Counts valid-length (64 to 1518 bytes), valid-CRC, collision-
free packets. Depending on the state of the CountMode bit
(6) in the Repeater Configuration Register, this counter will
count either all packets (CountMode=0) or only Unicast
Packets (CountMode=1).
rptrMonitorPortReadableOctets
(Lower/Upper)
0X1,
0X2
Counts the number of octets in all valid-length (64 to 1518
bytes), valid-CRC, collision-free packets, not including
preamble and framing bits. This register is not affected by the
CountMode bit.
rptrMonitorPortFrameCheckSequence
0X3
Counts valid length, collision-free packets that had FCS
errors, but were correctly framed (had an integral number of
octets).
rptrMonitorPortAlignmentErrors
0X4
Counts valid length, collision-free packets that had FCS
errors and were incorrectly framed (had a non-integral
number of octets).
rptrMonitorPortFramesTooLong
0X5
Counts packets that had a length greater than 1518 octets.
rptrMonitorPortShortEvents
0X6
10M:
Counts events <80 bit times.
100M:
Counts events
< 88 bit times.
rptrMonitorPortRunts
0X7
10M:
Counts events
>
80 and
<
504 bit times.
100M:
Counts events
>
92 and
<
504 bit times.
2
rptrMonitorPortCollisions
0X8
Counts the number of collisions that occurred, not including
late collisions.
rptrMonitorPortLateEvents
0X9
Counts the number of times collision was detected more than
512 bit times after the start of carrier.
rptrMonitorPortVeryLongEvents
0XA
Counts the number of times any activity continued for more
than 4 to 7.5 ms.
rptrMonitorPortDataRateMismatches
0XB
Counts the number of times the incoming data rate
mismatched the local clock source enough to cause a FIFO
underflow or overflow.
rptrMonitorPortAutoPartitions
0XC
Counts the number of times this port has been partitioned by
the Auto-partition algorithm.
rptrTrackSourceAddrChanges
0XD
Counts the number of times the source address has
changed.
Minimum roll-over time of 81 hours.
rptrMonitorPortBroadcastPkts
0XE
Counts the number of good broadcast packets received by
this port. Counter is not cleared by ZeroCount bit.
rptrMonitorPortMulticastPkts
0XF
Counts the number of good multicast packets received by
this port. Counter is not cleared by ZeroCount bit.
Registers used only when running at 100 Mbps
1. Replace
“
X
”
in address with specific port to be addressed (offsets 0 through 4 correspond to Ports 1 through 5).
2. For 100M: the
“
Short Events
”
register counts events < 88 bit times; the
“
Port Runts
”
register counts events > 92. A 4-bit-time
differential exists because 100M operates with nibble boundaries, so data packets < 4 bits are counted as 4.
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