參數(shù)資料
型號: L84302
元件分類: 通用總線功能
英文描述: L84302 Quad 100/10 Mbps 4-Port Ethernet Controller with RMON/SNMP Management Counters technical manual 4/02
中文描述: L84302四100/10 Mbps的4端口以太網(wǎng)的遠(yuǎn)程監(jiān)控控制器/ SNMP管理處的技術(shù)手冊,4月2日
文件頁數(shù): 94/128頁
文件大小: 997K
代理商: L84302
94 of 128
April, 2002
L84302 Quad 4-Port Ethernet Controller - Technical Manual
Copyright 1997-2002 by LSI Logic Corporation. All rights reserved.
4.3 Power Supply Decoupling
There are 33 VDDs (VDD) and 36 GNDs (GND) on the L84302. All VDDs
should be connected together as close as possible to the device with a
large VDD plane. If the VDDs vary in potential by even a small amount,
noise and latchup can result. The VDDs should be kept to within 50 mV
of each other.
All GNDs should also be connected together as close as possible to the
device with a large ground plane. If the GNDs vary in potential by even
a small amount, noise and latchup can result. The VDDs should be kept
to within 50 mV of each other.
A 0.01-0.1uF decoupling capacitor should be connected between VDD
and GND for every eight sets of VDD/GND placed as close as possible
to the device pins, preferably within 0.5". The value should be chosen on
whether the noise from VDD-GND is high or low frequency. A
conservative approach would be to use two decoupling capacitors on
Table 39
MIB Objects vs. Counter Location For SNMP Interfaces
Group (RFC 1573 & 1573)
MIB Objects
Counter Location
Ctr.#
Register Address
ifInOctets
30
0110100
ifInUcastPkts
32
0110110
ifInNUcastPkts
9 +10
0011111 + 0100000
ifInDiscards
1
0010111
ifInErrors
2 + 3 + 4
0011000 + 0011001 + 0011010
ifOutOctets
31
0110101
ifOutUcastPkts
33
0110111
ifOutNUcastPkts
8 – 33
0011110 - 0110111
ifOutDiscards
28
0110010
ifOutErrors
29
0110011
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