- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄378055 > PM7329 (PMC-Sierra, Inc.) ATM TRAFFIC MANAGER AND SWITCH PDF資料下載
參數(shù)資料
| 型號： | PM7329 |
| 廠商： | PMC-Sierra, Inc. |
| 英文描述： | ATM TRAFFIC MANAGER AND SWITCH |
| 中文描述： | ATM流量管理器和開關(guān) |
| 文件頁數(shù)： | 84/232頁 |
| 文件大?。?/td> | 1585K |
| 代理商： | PM7329 |
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頁當(dāng)前第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頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁第222頁第223頁第224頁第225頁第226頁第227頁第228頁第229頁第230頁第231頁第232頁
PM7329 S/UNI-APEX-1K800
DATASHEET
PMC-2010141
ISSUE 2
ATM TRAFFIC MANAGER AND SWITCH
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
70
discard is identical to a frame discard caused by congestion from a statistical
count perspective.
A VC timeout watchdog is provided to protect memory resource should a re-
assembly not complete in a timely manner. There are two procedures that are
carried out by the watch dog. The first procedure is the patrol, which is
performed by the queue engine during regular cell en-queue and de-queue
sequence. Within the context record, there is a re-assembly parking state bit,
ReasPark. The watch dog has a current re-assembly parking state bit,
CurrentReasPark. Whenever a user cell (ie not RRM or OAM cell) arrives, the
ReasPark state bit is set to the CurrentReasPark. The watch dog, initiated by
the microprocessor, will walk through a programmable range of marked VCs, that
are currently being re-assembled, to check and see if ReasPark =
CurrentReasPark. If this is true, then the VC is deemed OK. If it finds a valid VC
with ReasPark != CurrentReasPark, the VC is deemed dead. The discovery of a
dead VC initiates the watch dog re-allocation procedure. When the patrol is
complete, the CurrentReasPark bit is automatically inverted to prepare for the
next patrol.
The watch dog re-allocation procedure is performed between the cell
receive/transmit servicing. All the buffers in the VC queue are reclaimed, the VC
Q congestion counters are reset to zero, the general discard count is updated,
and VC status is reset to receive the next incoming cell as a BOM. A per-VC
maskable interrupt is invoked and the ICI is stored in a register that only holds
the ICI of the last timed out VC.
10.9.2.3
Shape Fair Queuing
The S/UNI-APEX-1K800 shaper is a passive dual rate shaper based on a time
slot design. It will shape on a per VC basis, to the traffic parameters PCR, SCR
& MBS. Traffic shaping is available on the four WAN ports, but not on the loop
ports. A maximum of four out of the sixteen WAN port classes (four ports, four
classes per port) can have shaping applied to their output. Every VC connected
to a shaped class will have shaping applied to it, but each VC can have a unique
shape rate. Classes that are not shaped can coexist on the same port as
classes that are shaped, and there can be more than one shaped class on a
single port.
Each shaper has a fundamental time unit, QShpNRTRate, which defines the
minimum time increment between successively scheduled cells. Although each
shaper is independent, the aggregate shape rate (1/QShpNRTRate) of the active
shapers must be less than the device overall cell rate limit (1.42Mc/s @ 80MHz).
The VC’s SCR is defined by the number of fundamental time units, ShpIncr,
inserted between the VC’s cell as they are scheduled by the shaper. The SCR is
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PM7339 | Quad Cell Delineation Block Device |
| PM7340 | S/UNI INVERSE MULTIPLEXING FOR ATM, 8 LINKS |
| PM7340-PI | SCREW,WING |
| PM7341 | S/UNI INVERSE MULTIPLEXING FOR ATM, 84 LINKS |
| PM7342 | 32 Link Inverse Multiplexer for ATM (IMA) / UNI PHY |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PM7329-BI | 制造商:PMC 制造商全稱:PMC 功能描述:ATM TRAFFIC MANAGER AND SWITCH |
| PM733 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| PM7339 | 制造商:PMC 制造商全稱:PMC 功能描述:SATURN USER NETWORK INTERFACE CELL DELINEATION BLOCK |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。