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參數(shù)資料
| 型號： | IDT72V51443L7-5BB8 |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 45/50頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FLOW CTRL MULTI QUEUE 256-BGA |
| 標準包裝： | 1,000 |
| 類型： | 多隊列流量控制 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 256-BBGA |
| 供應商設備封裝： | 256-BGA（17x17） |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | 72V51443L7-5BB8 |
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IDT72V51433/72V51443/72V51453 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES
(16 QUEUES) 18 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
DETAILED DESCRIPTION
MULTI-QUEUE STRUCTURE
The IDT multi-queue flow-control device has a single data input port and
single data output port with up to 16 FIFO queues in parallel buffering between
the two ports. The user can setup between 1 and 16 Queues within the device.
Thesequeuescanbeconfiguredtoutilizethetotalavailablememory,providing
theuserwithfullflexibilityandabilitytoconfigurethequeuestobevariousdepths,
independent of one another.
MEMORY ORGANIZATION/ ALLOCATION
The memory is organized into what is known as “blocks”, each block being
512 x 18 or 1,024 x 9 bits. When the user is configuring the number of queues
and individual queue sizes the user must allocate the memory to respective
queues, in units of blocks, that is, a single queue can be made up from 0 to m
blocks,wheremisthetotalnumberofblocksavailablewithinadevice.Alsothe
total size of any given queue must be in increments of 512 x 18 or 1,024 x 9.
For the IDT72V51433, IDT72V51443 and IDT72V51453 the Total Available
Memoryis64,128and256blocksrespectively(ablockbeing512x18or1,024
x 9). If any port is configured for x18 bus width, a block size is 512 x 18. If both
the write and read ports are configured for x9 bus width, a block size is 1,024
x 9. Queues can be built from these blocks to make any size queue desired and
any number of queues desired.
BUS WIDTHS
Theinputportiscommontoallqueueswithinthedevice,asistheoutputport.
ThedeviceprovidestheuserwithBusMatchingoptionssuchthattheinputport
and output port can be either x9 or x18 bits wide, the read and write port widths
being set independently of one another. Because the ports are common to all
queues the width of the queues is not individually set, so that the input width of
all queues are equal and the output width of all queues are equal.
WRITING TO & READING FROM THE MULTI-QUEUE
Data being written into the device via the input port is directed to a discrete
queue via the write queue select address inputs. Conversely, data being read
fromthedevicereadportisreadfromaqueueselectedviathereadqueueselect
addressinputs.Datacanbesimultaneouslywrittenintoandreadfromthesame
queue or different queues. Once a queue is selected for data writes or reads,
the writing and reading operation is performed in the same manner as a
conventional IDT synchronous FIFO, utilizing clocks and enables, there is a
single clock and enable per port. When a specific queue is addressed on the
write port, data placed on the data inputs is written to that queue sequentially
basedontherisingedgeofawriteclockprovidedsetupandholdtimesaremet.
Conversely, data is read on to the output port after an access time from a rising
edge on a read clock.
Theoperationofthewriteportiscomparabletothefunctionofaconventional
FIFO operating in standard IDT mode. Write operations can be performed on
thewriteportprovidedthatthequeuecurrentlyselectedisnotfull,afullflagoutput
provides status of the selected queue. The operation of the read port is
comparable to the function of a conventional FIFO operating in FWFT mode.
When a queue is selected on the output port, the next word in that queue will
automaticallyfallthroughtotheoutputregister.Allsubsequentwordsfromthat
queue require an enabled read cycle. Data cannot be read from a selected
queueifthatqueueisempty,thereadportprovidesanOutputValidflagindicating
when data read out is valid. If the user switches to a queue that is empty, the
last word from the previous queue will remain on the output register.
Asmentioned,thewriteporthasafullflag,providingfullstatusoftheselected
queue.Alongwiththefullflagadedicatedalmostfullflagisprovided,thisalmost
full flag is similar to the almost full flag of a conventional IDT FIFO. The device
provides a user programmable almost full flag for all 16 queues and when a
respectivequeueisselectedonthewriteport,thealmostfullflagprovidesstatus
for that queue. Conversely, the read port has an output valid flag, providing
status of the data being read from the queue selected on the read port. As well
as the output valid flag the device provides a dedicated almost empty flag. This
almostemptyflagissimilartothealmostemptyflagofaconventionalIDTFIFO.
The device provides a user programmable almost empty flag for all 16 queues
andwhenarespectivequeueisselectedonthereadport,thealmostemptyflag
provides status for that queue.
PROGRAMMABLE FLAG BUSSES
Inadditiontothesededicatedflags,full&almostfullonthewriteportandoutput
valid&almostemptyonthereadport,therearetwoflagstatusbusses.Analmost
full flag status bus is provided, this bus is 8 bits wide. Also, an almost empty flag
status bus is provided, again this bus is 8 bits wide. The purpose of these flag
busses is to provide the user with a means by which to monitor the data levels
within queues that may not be selected on the write or read port. As mentioned,
the device provides almost full and almost empty registers (programmable by
the user) for each of the 16 queues in the device.
In the IDT72V51433/72V51443/72V51453 multi-queue flow-control de-
vices the user has the option of utilizing anywhere between 1 and 16 queues,
therefore the 8 bit flag status busses are multiplexed between the 16 queues,
a flag bus can only provide status for 8 of the 16 queues at any moment, this
isreferredtoasa“Sector”,suchthatwhenthebusisprovidingstatusofqueues
1 through 8, this is sector 1, when it is queues 9 through 16, this is sector 2. If
less than 16 queues are setup in the device, there are still 2 sectors, such that
in “Polled” mode of operation the flag bus will still cycle through 2 sectors. If for
exampleonly14 queuesaresetup,sector1willreflectstatusofqueues1through
8. Sector 2 will reflect the status of queues 9 through 14 on the least significant
6 bits, the most significant 2 bits of the flag bus are don’t care.
The flag busses are available in two user selectable modes of operation,
“Polled” or “Direct”. When operating in polled mode a flag bus provides status
of each sector sequentially, that is, on each rising edge of a clock the flag bus
isupdatedtoshowthestatusofeachsectorinorder.Therisingedgeofthewrite
clockwillupdatethealmostfullbusandarisingedgeonthereadclockwillupdate
the almost empty bus. The mode of operation is always the same for both the
almost full and almost empty flag busses. When operating in direct mode, the
sector on the flag bus is selected by the user. So the user can actually address
the sector to be placed on the flag status busses, these flag busses operate
independently of one another. Addressing of the almost full flag bus is done via
the write port and addressing of the almost empty flag bus is done via the read
port.
EXPANSION
Expansion of multi-queue devices is also possible, up to 8 devices can be
connectedinaparallelfashionprovidingthepossibilityofbothdepthexpansion
or queue expansion. Depth Expansion means expanding the depths of
individual queues. Queue expansion means increasing the total number of
queues available. Depth expansion is possible by virtue of the fact that more
memory blocks within a multi-queue device can be allocated to increase the
depth of a queue. For example, depth expansion of 8 devices provides the
possibilityof8queuesof32Kx18deepwithintheIDT72V51433,64Kx18deep
within the IDT72V51443, and 128K x 18 deep within the IDT72V51453, each
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| IDT72V51443L7-5BBI | 功能描述:IC FLOW CTRL MULTI QUEUE 256-BGA RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:調(diào)幀器 應用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應商設備封裝:400-PBGA（27x27） 包裝:散裝 |
| IDT72V51446L6BB | 功能描述:IC FLOW CTRL MULTI QUEUE 256-BGA RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:調(diào)幀器 應用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應商設備封裝:400-PBGA（27x27） 包裝:散裝 |
| IDT72V51446L6BB8 | 功能描述:IC FLOW CTRL MULTI QUEUE 256-BGA RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:調(diào)幀器 應用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應商設備封裝:400-PBGA（27x27） 包裝:散裝 |
| IDT72V51446L7-5BB | 功能描述:IC FLOW CTRL MULTI QUEUE 256-BGA RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:調(diào)幀器 應用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應商設備封裝:400-PBGA（27x27） 包裝:散裝 |
| IDT72V51446L7-5BB8 | 功能描述:IC FLOW CTRL MULTI QUEUE 256-BGA RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:調(diào)幀器 應用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應商設備封裝:400-PBGA（27x27） 包裝:散裝 |
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