參數(shù)資料
型號： IDT72V51236L7-5BB
廠商： IDT, Integrated Device Technology Inc
文件頁數(shù)： 10/56頁
文件大小： 0K
描述： IC FLOW CTRL MULTI QUEUE 256-BGA
標(biāo)準(zhǔn)包裝： 1
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(yīng)商設(shè)備封裝： 256-BGA（17x17）
包裝： 托盤
其它名稱： 72V51236L7-5BB
18
IDT72V51236/72V51246/72V51256 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES
(4 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
cycles are required for the device to load its internal setup registers. When a
single multi-queue is used, the completion of device programming is signaled
bythe
SENOoutputofadevicegoingfromHIGHtoLOW.Note,thatSENImust
be held LOW when a device is setup for default programming mode.
When multi-queue devices are connected in expansion mode, the
SENI of
thefirstdeviceinachaincanbeheldLOW.The
SENOofadeviceshouldconnect
to the
SENIofthenextdeviceinthechain.TheSENOofthefinaldeviceisused
to indicate that default programming of all devices is complete. When the final
SENO goes LOW normal operations may begin. Again, all devices will be
programmed with their maximum number of queues and the memory divided
equally between them. Please refer to Figure 8, Default Programming.
READING AND WRITING TO THE IDT MULTI-QUEUE
FLOW-CONTROL DEVICE
The IDT72V51236/72V51346/72V51256 multi-queue flow-control de-
vices can be configured in two distinct modes, namely Standard Mode and
Packet Mode.
STANDARD MODE OPERATION (PKT = LOW on Master Reset)
WRITE QUEUE SELECTION AND WRITE OPERATION
(STANDARD MODE)
The IDT72V51236/72V51346/72V51256 multi-queue flow-control de-
vices can be configured up to a maximum of 4 queues into which data can be
written via a common write port using the data inputs (Din), write clock (WCLK)
and write enable (
WEN). The queue to be written is selected by the address
present on the write address bus (WRADD) during a rising edge on WCLK
while write address enable (WADEN) is HIGH. The state of
WEN does not
impact the queue selection. The queue selection is requires 2 WCLK cycles.
All subsequent data writes will be to this queue until another queue is selected.
Standard mode operation is defined as individual words will be written to the
device as opposed to Packet Mode where complete packets may be written.
The write port is designed such that 100% bus utilization can be obtained. This
means that data can be written into the device on every WCLK rising edge
including the cycle that a new queue is being addressed.
Changing queues requires a minimum of 2 WCLK cycles on the write port
(see Figure 9, Write Queue Select, Write Operation and Full flag Operation).
WADEN goes high signaling a change of queue (clock cycle “A”). The address
onWRADDatthattimedeterminesthenextqueue.Datapresentedduringthat
cycle (“A”) and the next cycle (“B”), will be written to the active (old) queue,
provided
WEN is active LOW. If WEN is HIGH (inactive) for these two clock
cycles, data will not be written in to the previous queue. The write port discrete
full flag will update to show the full status of the newly selected queue (Q
X) at
this last cycle’s rising edge (“B”). Data present on the data input bus (Din), can
be written into the newly selected queue (Q
X) on the rising edge of WCLK on
the second cycle (“C”) following a change of queue, provided
WEN is LOW
and the new queue is not full. If the newly selected queue is full at the point of
its selection, any writes to that queue will be prevented. Data cannot be written
into a full queue.
Refer to Figure 9, Write Queue Select, Write Operation and Full flag
Operation, Figure 10, Write Operations & First Word Fall Through for timing
diagrams and Figure 11, Full Flag Timing in Expansion Mode for timing
diagrams.
TABLE 1 — WRITE ADDRESS BUS, WRADD[4:0]
Operation WCLK WADEN
FSTR
WRADD[4:0]
Write Queue
Select
10
01
Device Select
(Compared to
ID0,1,2)
Write Queue Address
(2 bits = 4 Queues)
432
1 0
432
1 0
Device Select
(Compared to
ID0,1,2)
XX
PAFn Flag Bus
Device Select
5937 drw05
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IDT72V51243L6BB8 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(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:調(diào)幀器 應(yīng)用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應(yīng)商設(shè)備封裝:400-PBGA（27x27） 包裝:散裝
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