參數(shù)資料
型號： AM79C987JC
廠商： ADVANCED MICRO DEVICES INC
元件分類： 網(wǎng)絡(luò)接口
英文描述： Hardware Implemented Management Information Base (HIMIB) Device
中文描述： DATACOM, ETHERNET TRANSCEIVER, PQCC28
封裝： PLASTIC, LCC-28
文件頁數(shù)： 18/30頁
文件大?。?/td> 183K
代理商： AM79C987JC
AMD
P R E L I M I N A R Y
18
Am79C987
Frames Too Long
P[4:0] = 16–23, 31, R[4:0] = 4
Byte 0
Byte 1
Byte 2
Byte 3
bit 7
bit 31
bit 0
bit 24
MSB
LSB
D Port Read
“Frames Too Long” is a read-only attribute that counts
the number of frames that exceed the maximum valid
packet length of 1518 bytes. This attribute is a 32-bit
counter with a minimum rollover time of 61 days.
Short Events
P[4:0] = 16–23, 31, R[4:0] = 5
Byte 0
Byte 1
Byte 2
Byte 3
bit 7
bit 31
bit 0
bit 24
MSB
LSB
D Port Read
“Short Events” is a read-only attribute that counts the
number of instances where activity is detected with a du-
ration less than the “ShortEventMaxTime” (74–82-bit
times). This attribute is a 32-bit counter with a minimum
rollover time of 16 hours.
Runts
P[4:0] = 16–23, 31, R[4:0] = 6
Byte 0
Byte 1
Byte 2
Byte 3
bit 7
bit 31
bit 0
bit 24
MSB
LSB
D Port Read
“Runts” is a read-only attribute that counts the number of
instances where activity is detected with a duration
greater than the “ShortEventMaxTime” (74–82-bit
times), but less than the minimum valid frame time
(512-bit times, or 64 bytes). This attribute is a 32-bit
counter with a minimum rollover time of 16 hours.
Note:
Runts usually ndicate collision fragments, a nor-
mal network event. In certain situation associated with
large diameter networks a percentage of runts may ex-
ceed ValidPacketMinTime.
Collisions
P[4:0] = 16–23, 31, R[4:0] = 7
Byte 0
Byte 1
Byte 2
Byte 3
bit 7
bit 31
bit 0
bit 24
MSB
LSB
D Port Read
“Collisions” is a read-only attribute that counts the num-
ber of instances where a carrier is detected on the port,
and a collision is detected. This attribute is a 32-bit
counter with a minimum rollover time of 16 hours.
Late Events
P[4:0] = 16–23, 31, R[4:0] = 8
Byte 0
Byte 1
Byte 2
Byte 3
bit 7
bit 31
bit 0
bit 24
MSB
LSB
D Port Read
“Late Events” is a read-only attribute that counts the
number of instances where a collision is detected after
the LateEventThreshold (480–565-bit times) in the
frame. This event will be counted both by the “Late
Events” attribute, as well as the “Collisions” attribute.
This attribute is a 32-bit counter with a minimum rollover
time of 81 hours.
Very Long Events
P[4:0] = 16–23, 31, R[4:0] = 9
Byte 0
Byte 1
Byte 2
Byte 3
bit 7
bit 31
bit 0
bit 24
MSB
LSB
D Port Read
“Very Long Events” is a read-only attribute that counts
the number of times the transmitter is active in excess of
the MAU Jabber Lockup Protection (MJLP) Timer (4 ms
– 7.5 ms). This attribute is a 32-bit counter with a mini-
mum rollover time of 198 days.
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C987JCB 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Hardware Implemented Management Information Base (HIMIB) Device
AM79C988 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Quad Integrated Ethernet Transceiver (QuIET⑩)
AM79C988A 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Quad Integrated Ethernet Transceiver (QuIET⑩)
AM79C988BJC 制造商:Rochester Electronics LLC 功能描述:- Bulk
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