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72241L25PFGI8 Datasheet(PDF) 7 Page - Integrated Device Technology |
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72241L25PFGI8 Datasheet(HTML) 7 Page - Integrated Device Technology |
7 / 14 page 7 © COMMERCIALANDINDUSTRIAL TEMPERATURERANGES IDT72421/72201/72211/72221/72231/72241/72251 CMOS SyncFIFO™ 64 x 9, 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 OUTPUTS: FULL FLAG (FF) TheFullFlag(FF)willgoLOW,inhibitingfurtherwriteoperation,whenthe device is full. If no reads are performed after Reset (RS), the Full Flag (FF) willgoLOWafter64writesfortheIDT72421,256writesfortheIDT72201,512 writes for the IDT72211, 1,024 writes for the IDT72221, 2,048 writes for the IDT72231,4,096writesfortheIDT72241,and8,192writesfortheIDT72251. The Full Flag (FF) is synchronized with respect to the LOW-to-HIGH transitionoftheWriteClock(WCLK). EMPTY FLAG (EF) TheEmptyFlag(EF)willgoLOW,inhibitingfurtherreadoperations,when the read pointer is equal to the write pointer, indicating the device is empty. The Empty Flag (EF) is synchronized with respect to the LOW-to-HIGH transition of the Read Clock (RCLK). PROGRAMMABLE ALMOST-FULL FLAG (PAF) The Programmable Almost-Full flag (PAF) will go LOW when the FIFO reachesthealmost-fullcondition.IfnoreadsareperformedafterReset(RS), theProgrammableAlmost-Fullflag(PAF)willgoLOWafter(64-m)writesforthe IDT72421,(256-m)writesfortheIDT72201,(512-m)writesfortheIDT72211, TABLE 1 — STATUS FLAGS NUMBER OF WORDS IN FIFO IDT72421 IDT72201 IDT72211 FF PAF PAE EF 00 0 H H L L 1 to n 1 to n 1 to n H H L H (n+1)to(64-(m+1)) (n+1)to(256-(m+1)) (n+1)to(512-(m+1)) H H H H (64-m)(2) to63 (256-m)(2) to255 (512-m)(2) to511 H L H H 64 256 512 L L H H NUMBER OF WORDS IN FIFO IDT72221 IDT72231 IDT72241 IDT72251 FF PAF PAE EF 00 0 0 H H L L 1 to n(1) 1 to n(1) 1 to n(1) 1 to n(1) HH L H (n+1)to(1,024-(m+1)) (n+1)to(2,048-(m+1)) (n+1)to(4,096-(m+1)) (n+1)to(8,192-(m+1)) H H H H (1,024-m)(2) to1,023 (2,048-m)(2) to2,047 (4,096-m)(2) to4,095 (8,192-m)(2) to8,191 H L H H 1,024 2,048 4,096 8,192 L L H H NOTES: 1. n = Empty Offset (n = 7 default value) 2. m = Full Offset (m = 7 default value) (1,024-m)writesfortheIDT72221,(2,048-m)writesfortheIDT72231,(4,096- m)writesfortheIDT72241,and(8,192-m)writesfortheIDT72251. Theoffset “m”isdefinedintheFulloffsetregisters. IfthereisnoFulloffsetspecified,theProgrammableAlmost-Fullflag(PAF) will go LOW at Full-7 words. TheProgrammableAlmost-Fullflag(PAF)issynchronizedwithrespectto theLOW-to-HIGHtransitionoftheWriteClock(WCLK). PROGRAMMABLEALMOST-EMPTYFLAG(PAE) TheProgrammableAlmost-Emptyflag(PAE)willgoLOWwhentheread pointer is "n+1" locations less than the write pointer. The offset "n" is defined in the Empty Offset registers. If no reads are performed after Reset the Programmable Almost-Empty flag (PAE) will go HIGH after "n+1" for the IDT72421/72201/72211/72221/72231/72241/72251. IfthereisnoEmptyoffsetspecified,theProgrammableAlmost-Emptyflag (PAE) will go LOW at Empty+7 words. TheProgrammableAlmost-Emptyflag(PAE)issynchronizedwithrespect to the LOW-to-HIGH transition of the Read Clock (RCLK). DATA OUTPUTS (Q0 - Q8) Data outputs for a 9-bit wide data. (1) (1) (1) |
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