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72V221L10PFG Datasheet(PDF) 7 Page - Integrated Device Technology |
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72V221L10PFG Datasheet(HTML) 7 Page - Integrated Device Technology |
7 / 14 page 7 IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 COMMERCIALANDINDUSTRIAL TEMPERATURERANGES OUTPUTS: FULL FLAG (FF) TheFullFlag(FF)willgoLOW,inhibitingfurtherwriteoperation,whenthe device is full. If no reads are performed after Reset (RS), the Full Flag (FF) willgoLOWafter256writesfortheIDT72V201,512writesfortheIDT72V211, 1,024writesfortheIDT72V221,2,048writesfortheIDT72V231,4,096writes for the IDT72V241 and 8,192 writes for the IDT72V251. 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 (256-m)writesfor the IDT72V201, (512-m) writes for the IDT72V211, (1,024-m) writes for the IDT72V221, (2,048-m) writes for the IDT72V231, (4,096-m) writes for the IDT72V241and(8,192-m)writesfortheIDT72V251. Theoffset“m”isdefined intheFullOffsetregisters. 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 IDT72V201/72V211/72V221/72V231/72V241/72V251. 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. NUMBER OF WORDS IN FIFO IDT72V201 IDT72V211 IDT72V221 FF PAF PAE EF 00 0 H H L L 1 to n(1) 1 to n(1) 1 to n(1) HH L H (n+1)to(256-(m+1)) (n+1)to(512-(m+1)) (n+1)to(1,024-(m+1)) HHHH (256-m)(2)to255 (512-m)(2)to511 (1,024-m)(2)to1,023 H L H H 256 512 1,024 L L H H NUMBER OF WORDS IN FIFO IDT72V231 IDT72V241 IDT72V251 FF PAF PAE EF 000 H H L L 1 to n(1) 1 to n(1) 1 to n(1) HH L H (n+1)to(2,048-(m+1)) (n+1)to(4,096-(m+1)) (n+1)to(8,192-(m+1)) HHHH (2,048-m)(2)to2,047 (4,096-m)(2) to4,095 (8,192-m)(2) to8,191 H L H H 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) TABLE 1 — STATUS FLAGS |
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