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參數(shù)資料
| 型號(hào)： | AM79C987 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Hardware Implemented Management Information Base (HIMIB) Device |
| 中文描述： | 硬件實(shí)現(xiàn)管理信息庫（HIMIB）設(shè)備 |
| 文件頁數(shù)： | 18/30頁 |
| 文件大小： | 183K |
| 代理商： | AM79C987 |
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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 |
|---|---|
| AM79C987JC | Hardware Implemented Management Information Base (HIMIB) Device |
| AM79C987JCB | Hardware Implemented Management Information Base (HIMIB) Device |
| AM79C988A | IC,Motor Controller,CMOS,SOP,8PIN |
| AM79C988 | Quad Integrated Ethernet Transceiver (QuIET⑩) |
| Am79C988BJC | Quad Integrated Ethernet Transceiver (QuIET⑩) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C987JC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Hardware Implemented Management Information Base (HIMIB) Device |
| 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) |
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