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參數(shù)資料
| 型號： | 84302 |
| 廠商： | LSI Corporation |
| 英文描述： | 4-Port Fast Ethernet Controller( 4端口快速以太網(wǎng)控制器) |
| 中文描述： | 4端口快速以太網(wǎng)控制器（4端口快速以太網(wǎng)控制器） |
| 文件頁數(shù)： | 67/96頁 |
| 文件大?。?/td> | 826K |
| 代理商： | 84302 |
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84302 4-Port
Fast Ethernet Controller
4-67
MD400171/C
POWER SUPPLY DECOUPLING
There are thirty three VDD’s (VDD) and thirty six GND’s
(GND) on the 84302.
All VDD’s should be connected together as close as
possible to the device with a arge VDD plane. If the VDD’s
vary n potential by even a small amount, noise and atchup
can result. The VDD’s should be kept to within 50 mV of
each other.
All GND’s should also be connected together as close as
possible to the device with a large ground plane. If the
GND’s vary n potential by even a small amount, noise and
latchup can result. The VDD’s 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 conser-
vative approach would be to use two decoupling capaci-
tors on each VDD/GND set, one 0.1uf for low frequency
and one 0.001uf for high frequency noise on the power
supply.
The PCB layout and power supply decoupling discussed
above should provide sufficient decoupling to achieve the
following when measured at the device: (1) The resultant
AC noise voltage measured across each VDD/GND set
should be less than 100 mVpp, (2) All VDD’s should be
within 50 mVpp of each other, and (3) All GND’s should be
within 50 mVpp of each other.
Table 41
MIB Objects vs. Counter Location
For Ethernet MIB
(IEEE 802.3 Clause 30)
MIB Objects
Counter
Location
Ctr. Register
#
Address
aFramesTransmittedOK
8 -
29
0011110-
0110011
aSingleCollisionFrames
34
0111000
aMultipleCollisionFrames
35
0111001
aFramesReceivedOK
32+ 0110110+
9+
0011111+
10
0100000
aFrameCheckSequenceErrors
36
0111010
aAlignmentErrors
37
0111011
aOctetsTransmittedOK
38
0111100
aFramesWithDeferredXmissions
39
0111101
aLateCollisions
40
0111110
aFrameAbortedDueToXSCollisions
41
0111111
aFrameAbortedDueToIntMACXmitError 28
0110010
aCarrierSenseErrors
42
1000000
aOctetsReceivedOK
43
1000001
aFramesLostDueToIntMACRcvrError
1
0010111
aMulticastFrameXmittedOK
20
0101010
aBroadcastFramesXmittedOK
19
0101001
aFramesWithExcessiveDefferal
44
1000010
aMulticastFramesReceivedOK
10
0100000
aBroadcastFramesReceivedOK
9
0011111
aInRangeLengthErrors
45
1000011
aOutofRangeLengthField
46
1000100
aFrameTooLongErrors
4
0011010
aSQETESTErrors
51
1001001
aSymbolErrorDuringCarrier
47
1000101
aMACControlFramesTransmitted
48
1000110
aMACControlFramesReceived
49
1000111
aUnsupportedOpcodesReceived
50
1001000
aPauseMACCtrlFramesTransmitted
48
1000110
aPauseMACCtrlFramesReceived
49
1000111
Table 40
MIB Objects vs. Counter Location
For Ethernet-Like MIB(RFC 1643)
MIB Objects
Counter
Location
Ctr.
#
37
36
34
35
51
39
40
41
28
42
4
1
Register
Address
0111011
0111010
0111000
0111001
1001001
0111101
0111110
0111111
0110010
1000000
0011010
0010111
dot3StatsAlignmentErrors
dot3StatsFCSErrors
dot3StatsSingleCollisionFrames
dot3StatsMultipleCollisionFrames
dot3StatsSQETESTErrors
dot3DeferredTransmissions
dot3StatsLateCollisions
dot3StatsExcessiveCollisions
dot3StatsInternalMacTransmitErrors
dot3StatsCarrierSenseErrors
dot3StatsFrameTooLongs
dot3StatsInternalMacReceiveErrors
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