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72V03L25JGI Datasheet(PDF) 4 Page - Integrated Device Technology |
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72V03L25JGI Datasheet(HTML) 4 Page - Integrated Device Technology |
4 / 12 page 4 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT72V01/72V02/72V03/72V04/72V05/72V06 3.3V ASYNCHRONOUS FIFO 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9, 8,192 x 9 and 16,384 x 9 SIGNAL DESCRIPTIONS INPUTS: DATA IN (D0 – D8) Data inputs for 9-bit wide data. CONTROLS: RESET (RS) Reset is accomplished whenever the Reset (RS) input is taken to a LOW state. During reset, both internal read and write pointers are set to the first location. A reset is required after power up before a write operation can take place. Both the Read Enable (R) and Write Enable (W) inputs must be in the HIGH state during the window shown in Figure 2, (i.e., tRSS before the rising edge of RS ) and should not change until tRSR after the rising edge of RS. Half-Full Flag (HF) will be reset to HIGH after Reset (RS). WRITE ENABLE (W) A write cycle is initiated on the falling edge of this input if the Full Flag (FF) isnotset. Datasetupandholdtimesmustbeadheredtowithrespecttotherising edgeoftheWriteEnable(W). DataisstoredintheRAMarraysequentiallyand independently of any ongoing read operation. After half of the memory is filled and at the falling edge of the next write operation,theHalf-FullFlag(HF)willbesettoLOWandwillremainsetuntilthe difference between the write pointer and read pointer is less than or equal to onehalfofthetotalmemoryofthedevice. TheHalf-FullFlag(HF)isthenreset by the rising edge of the read operation. Topreventdataoverflow,theFullFlag(FF)willgoLOW,inhibitingfurther write operations. Upon the completion of a valid read operation, the Full Flag (FF) will go HIGH after tRFF, allowing a valid write to begin. When the FIFO isfull,theinternalwritepointerisblockedfromW,soexternalchangesinWwill notaffecttheFIFOwhenitisfull. READ ENABLE (R) AreadcycleisinitiatedonthefallingedgeoftheReadEnable(R)provided theEmptyFlag(EF)isnotset.ThedataisaccessedonaFirst-In/First-Outbasis, independent of any ongoing write operations. After Read Enable (R) goes HIGH,theDataOutputs(Q0–Q8)willreturntoahighimpedanceconditionuntil thenextReadoperation. WhenalldatahasbeenreadfromtheFIFO,theEmpty Flag(EF)willgoLOW,allowingthe“final”readcyclebutinhibitingfurtherread operationswiththedataoutputsremaininginahighimpedancestate.Oncea validwriteoperationhasbeenaccomplished,theEmptyFlag(EF)willgoHIGH aftertWEFandavalidReadcanthenbegin. WhentheFIFOisempty,theinternal readpointerisblockedfromRsoexternalchangesinRwillnotaffecttheFIFO when it is empty. FIRST LOAD/RETRANSMIT (FL/RT) This is a dual-purpose input. In the Depth Expansion Mode, this pin is groundedtoindicatethatitisthefirstloaded(seeOperatingModes).IntheSingle DeviceMode,thispinactsastheretransmitinput. TheSingleDeviceModeis initiated by grounding the Expansion In (XI). TheseFIFOscanbemadetoretransmitdatawhentheRetransmitEnable control(RT)inputispulsedLOW. Aretransmitoperationwillsettheinternalread pointertothefirstlocationandwillnotaffectthewritepointer.ReadEnable(R) andWriteEnable(W)mustbeintheHIGHstateduringretransmit.Thisfeature is useful when less than 512/1,024/2,048/4,096/8,192/16,384 writes are performed between resets. The retransmit feature is not compatible with the Depth Expansion Mode and will affect the Half-Full Flag (HF), depending on the relative locations of the read and write pointers. EXPANSION IN (XI) Thisinputisadual-purposepin.ExpansionIn(XI)isgroundedtoindicate an operation in the single device mode. Expansion In (XI) is connected to Expansion Out (XO) of the previous device in the Depth Expansion or Daisy Chain Mode. OUTPUTS: FULL FLAG (FF) TheFullFlag(FF)willgoLOW,inhibitingfurtherwriteoperation,whenthe writepointerisonelocationlessthanthereadpointer,indicatingthatthedevice is full. If the read pointer is not moved after Reset (RS), the Full-Flag (FF)will go LOW after 512/1,024/2,048/4,096/8,192/16,384 writes to the IDT72V01/ 72V02/72V03/72V04/72V05/72V06. EMPTY FLAG (EF) TheEmptyFlag(EF)willgoLOW,inhibitingfurtherreadoperations,when thereadpointerisequaltothewritepointer,indicatingthatthedeviceisempty. EXPANSION OUT/HALF-FULL FLAG (XO/HF) Thisisadual-purposeoutput. Inthesingledevicemode,whenExpansion In (XI) is grounded, this output acts as an indication of a half-full memory. After half of the memory is filled and at the falling edge of the next write operation,theHalf-FullFlag(HF)willbesetLOWandwillremainsetuntilthe difference between the write pointer and read pointer is less than or equal to onehalfofthetotalmemoryofthedevice.TheHalf-FullFlag(HF)isthenreset by using rising edge of the read operation. IntheDepthExpansionMode,ExpansionIn(XI)isconnectedtoExpansion Out(XO)ofthepreviousdevice.Thisoutputactsasasignaltothenextdevice in the Daisy Chain by providing a pulse to the next device when the previous devicereachesthelastlocationofmemory. DATA OUTPUTS (Q0 – Q8) Dataoutputsfor9-bitwidedata. Thisdataisinahighimpedancecondition whenever Read (R) is in a HIGH state. |
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