- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄360706 > IBM3209K4060 Telecom Switching Circuit PDF資料下載
參數(shù)資料
| 型號(hào)： | IBM3209K4060 |
| 英文描述： | Telecom Switching Circuit |
| 中文描述： | 電信開關(guān)電路 |
| 文件頁數(shù)： | 18/131頁 |
| 文件大?。?/td> | 1679K |
| 代理商： | IBM3209K4060 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁當(dāng)前第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁
PRS28.4G
IBM Packet Routing Switch
Architecture
Page 18 of 131
prs28.03.fm
August 31, 2000
priority) is below the output priority threshold. It is removed whenever this count exceeds the threshold value
(no hysteresis). Grants are also provided for the shared memory for each priority. The shared memory grant
(memory grant) for a given priority is provided whenever the total packet count in shared memory is below the
shared memory priority threshold. It is removed whenever this count exceeds the threshold value (no hyster-
esis).
An adapter is only allowed to transmit a packet when it has the memory grant for the packet priority as well as
the output queue grants for the destination logical outputs. For multicast packets, the adapter is allowed to
transmit a packet if it has the memory grant for the packet priority, regardless of output queue grants.
Incoming packets also carry a drop flag. This flag allows packet discard at the input of the island whenever
the memory grant and/or output queue grants are removed before the packet is received from the attached
adapter (due to the latency in grant update). The grant information used by the input controllers to decide to
drop a packet is updated once every sequencer cycle, providing fairness among all inputs.
Finally, an anti-streaming function is provided at the input controllers to detect badly behaving adapters.
When an adapter sends a packet to an output priority for which the output queue grant or memory grant have
not been given in the past eight packet cycles, the packet is discarded and an interrupt is raised. For multicast
packets, the same mechanism is applied, but it takes only the memory grants into consideration.
2.1.8 Outgoing Flow Process
In each of the four logical output queues, control packets and Data Packets are transmitted in the following
order:
1. Control Packets
2. Priority 0 packets
3. Priority 1 packets
4. Priority 2 packets
5. Priority 3 packets
This order cannot be changed. Packets of higher priority overtake packets of lower priority.
Control Packets are constructed by the local processor and can be transmitted one at a time to multiple
outputs The control packets take precedence over any other packet present in the shared memory.
2.1.9 Outgoing Flow Control
Flow control at the output is also provided by send grants (one per output), regardless of priority. A packet on
a given output can only be transmitted if the send grant is provided for that output.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IBM3288H2848 | Telecommunication IC |
| IBM32NPR100EXXCAB133 | Microprocessor |
| IBM32NPR101EPXCAC133 | Microprocessor |
| IBM37RGB524CF17A | Video DAC with Color Palette (RAMDAC) |
| IBM37RGB524CF22A | Video DAC with Color Palette (RAMDAC) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IBM3288H2848 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| IBM32NPR100EXXCAB133 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microprocessor |
| IBM32NPR101EPXCAC133 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microprocessor |
| IBM35CPC945C03C-2 | 制造商:IBM 功能描述: |
| IBM37RGB524CF17A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC) |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。