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IDT72V36110L15PF Datasheet(PDF) 9 Page - Integrated Device Technology |
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IDT72V36110L15PF Datasheet(HTML) 9 Page - Integrated Device Technology |
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9 / 36 page  9 COMMERCIAL AND INDUSTRIAL TEMPERATURERANGES IDT72V3640/50/60/70/80/90/110 3.3V HIGH DENSITY SUPERSYNC IITM 36-BIT FIFO 1,024 x 36, 2,048 x 36, 4,096 x 36, 8,192 x 36, 16,384 x 36, 32,768 x 36, 65,536 x 36, 131,072 x 36 writes for the IDT72V36100 and 131,072 writes for the IDT72V36110, respectively. If the FIFO is full, the first read operation will cause FF to go HIGH. Subsequentreadoperationswillcause PAFandHFtogoHIGHattheconditions described in Table 3. If further read operations occur, without write operations, PAE will go LOW when there are n words in the FIFO, where n is the empty offsetvalue.ContinuingreadoperationswillcausetheFIFOtobecomeempty. When the last word has been read from the FIFO, the EFwillgoLOWinhibiting further read operations. REN is ignored when the FIFO is empty. When configured in IDT Standard mode, the EFandFFoutputsaredouble register-bufferedoutputs. Relevant timing diagrams for IDT Standard mode can be found in Figure 7,8,11 and 13. FIRST WORD FALL THROUGH MODE (FWFT) In this mode, the status flags, IR, PAF, HF, PAE, and OR operate in the manner outlined in Table 4. To write data into to the FIFO, WENmustbeLOW. DatapresentedtotheDATAINlineswillbeclockedintotheFIFOonsubsequent transitions of WCLK. After the first write is performed, the Output Ready ( OR) flag will go LOW. Subsequent writes will continue to fill up the FIFO. PAEwillgo HIGH after n + 2 words have been loaded into the FIFO, where n is the empty offsetvalue.ThedefaultsettingforthesevaluesarestatedinthefootnoteofTable 2. This parameter is also user programmable. See section on Programmable Flag Offset Loading. If one continued to write data into the FIFO, and we assumed no read operationsweretakingplace,the HFwouldtoggletoLOWoncethe514thword for the IDT72V3640, 1,026th word for the IDT72V3650, 2,050th word for the IDT72V3660, 4,098th word for the IDT72V3670, 8,194th word for the IDT72V3680, 16,386th word for the IDT72V3690, 32,770th word for the IDT72V36100 and 65,538th word for the IDT72V36110, respectively was written into the FIFO. Continuing to write data into the FIFO will cause the PAF togoLOW.Again,ifnoreadsareperformed, the PAFwillgoLOWafter(1,025-m) writes for the IDT72V3640, (2,049-m) writes for the IDT72V3650, (4,097-m) writes for the IDT72V3660 and (8,193-m) writes for the IDT72V3670, 16,385 writes for the IDT72V3680, 32,769 writes for the IDT72V3690, 65,537 writes for the IDT72V36100 and 131,073 writes for the IDT72V36110, where m is the full offset value. The default setting for these values are stated in the footnote of Table 2. WhentheFIFOisfull,theInputReady( IR)flagwillgoHIGH,inhibitingfurther write operations. If no reads are performed after a reset, IRwillgoHIGHafter D writes to the FIFO. D = 1,025 writes for the IDT72V3640, 2,049 writes for the IDT72V3650, 4,097 writes for the IDT72V3660 and 8,193 writes for the IDT72V3670,16,385 writes for the IDT72V3680, 32,769 writes for the IDT72V3690, 65,537 writes for the IDT72V36100 and 131,073 writes for the IDT72V36110,respectively.NotethattheadditionalwordinFWFTmodeisdue to the capacity of the memory plus output register. If the FIFO is full, the first read operation will cause the IR flag to go LOW. Subsequent read operations will cause the PAF and HF to go HIGH at the conditions described in Table 4. If further read operations occur, without write operations,the PAEwillgoLOWwhentherearen+1wordsintheFIFO,where n is the empty offset value. Continuing read operations will cause the FIFO to become empty. When the last word has been read from the FIFO, OR will go HIGHinhibitingfurtherreadoperations. RENisignoredwhentheFIFOisempty. When configured in FWFT mode, the OR flag output is triple register- buffered, and the IR flag output is double register-buffered. Relevant timing diagrams for FWFT mode can be found in Figure 9, 10, 12, and 14. FUNCTIONAL DESCRIPTION TIMING MODES: IDT STANDARD vs FIRST WORD FALL THROUGH (FWFT) MODE The IDT72V3640/72V3650/72V3660/72V3670/72V3680/72V3690/ 72V36100/72V36110 support two different timing modes of operation: IDT Standard mode or First Word Fall Through (FWFT) mode. The selection of which mode will operate is determined during Master Reset, by the state of the FWFT/SI input. If, at the time of Master Reset, FWFT/SI is LOW, then IDT Standard mode will be selected. This mode uses the Empty Flag ( EF) to indicate whether or not there are any words present in the FIFO. It also uses the Full Flag function ( FF) to indicate whether or not the FIFO has any free space for writing. In IDT Standard mode, every word read from the FIFO, including the first, must be requested using the Read Enable ( REN) and RCLK. If, at the time of Master Reset, FWFT/SI is HIGH, then FWFT mode will be selected. This mode uses Output Ready ( OR)toindicatewhetherornotthere is valid data at the data outputs (Qn). It also uses Input Ready ( IR) to indicate whether or not the FIFO has any free space for writing. In the FWFT mode, thefirstwordwrittentoanemptyFIFOgoesdirectlytoQnafterthreeRCLKrising edges, REN = LOW is not necessary. Subsequent words must be accessed using the Read Enable ( REN) and RCLK. Varioussignals,bothinputandoutputsignalsoperatedifferentlydepending on which timing mode is in effect. IDT STANDARD MODE In this mode, the status flags, FF, PAF, HF, PAE, and EF operate in the manner outlined in Table 3. To write data into to the FIFO, Write Enable ( WEN) mustbeLOW.DatapresentedtotheDATAINlineswillbeclockedintotheFIFO on subsequent transitions of the Write Clock (WCLK). After the first write is performed, the Empty Flag ( EF)willgoHIGH.Subsequentwriteswillcontinue to fill up the FIFO. The Programmable Almost-Empty flag ( PAE)willgoHIGH after n + 1 words have been loaded into the FIFO, where n is the empty offset value. The default setting for these values are stated in the footnote of Table 2. Thisparameterisalsouserprogrammable.SeesectiononProgrammableFlag OffsetLoading. If one continued to write data into the FIFO, and we assumed no read operations were taking place, the Half-Full flag ( HF)wouldtoggletoLOWonce the 513rd word for IDT72V3640, 1,025th word for IDT72V3650, 2,049th word for IDT72V3660, 4,097th word for IDT72V3670, 8,193th word for the IDT72V3680, 16,385th word for the IDT72V3690, 32,769th word for the IDT72V36100 and 65,537th word for the IDT72V36110, respectively was written into the FIFO. Continuing to write data into the FIFO will cause the Programmable Almost-Full flag ( PAF) to go LOW. Again, if no reads are performed, the PAF will go LOW after (1,024-m) writes for the IDT72V3640, (2,048-m) writes for the IDT72V3650, (4,096-m) writes for the IDT72V3660, (8,192-m) writes for the IDT72V3670, (16,384-m) writes for the IDT72V3680, (32,768-m)writesfortheIDT72V3690,(65,536-m)writesfortheIDT72V36100 and (131,072-m) writes for the IDT72V36110. The offset “m” is the full offset value. The default setting for these values are stated in the footnote of Table 2. Thisparameterisalsouserprogrammable.SeesectiononProgrammableFlag OffsetLoading. When the FIFO is full, the Full Flag ( FF)willgoLOW,inhibitingfurtherwrite operations. Ifnoreadsareperformedafterareset, FFwillgoLOWafterDwrites to the FIFO. D = 1,024 writes for the IDT72V3640, 2,048 writes for the IDT72V3650,4,096writesfortheIDT72V3660,8,192writesfortheIDT72V3670, 16,384 writes for the IDT72V3680, 32,768 writes for the IDT72V3690, 65,536 |
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