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IDT72V841 Datasheet(PDF) 8 Page - Integrated Device Technology |
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IDT72V841 Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 16 page 8 IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFOTM DUAL 256 x 9, DUAL 512 x 9, DUAL 1K x 9, DUAL 2K x 9, DUAL 4K x 9, DUAL 8K x 9 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES OUTPUTS OUTPUTS OUTPUTS OUTPUTS OUTPUTS::::: Full Flag (FFA, FFB) — FFA (FFB) will go LOW, inhibiting further write operations, when Array A (B) is full. If no reads are performed after reset, FFA(FFB) will go LOW after 256 writes to the IDT72V801's FIFO A (B), 512 writestotheIDT72V811'sFIFOA(B),1,024writestotheIDT72V821'sFIFO A (B), 2,048 writes to the IDT72V831's FIFO A (B), 4,096 writes to the IDT72V841's FIFO A (B), or 8,192 writes to the IDT72V851's FIFO A (B). FFA(FFB) is synchronized with respect to the LOW-to-HIGH transition of theWriteClockWCLKA(WCLKB). Empty Flag (EFA, EFB) — EFA(EFB) will go LOW, inhibiting further read operations,whenthereadpointerisequaltothewritepointer,indicatingthat Array A (B) is empty. EFA(EFB) is synchronized with respect to the LOW-to-HIGH transition of the Read Clock RCLKA (RCLKB). ProgrammableAlmost–FullFlag(PAFA, PAFB) —PAFA(PAFB)willgo LOWwhentheamountofdatainArrayA(B)reachestheAlmost-Fullcondition. If no reads are performed after reset, PAFA(PAFB) will go LOW after (256-m) writestotheIDT72V801'sFIFOA(B),(512-m)writestotheIDT72V811'sFIFO A (B), (1,024-m) writes to the IDT72V821's FIFO A (B), (2,048-m) writes to the IDT72V831's FIFO A (B), (4,096-m) writes to the IDT72V841's FIFO A (B), or (8,1912-m) writes to the IDT72V851's FIFO A (B). FFA(FFB) is synchronized with respect to the LOW-to-HIGH transition of theWriteClockWCLKA(WCLKB). Theoffset“m”isdefinedintheFullOffset Registers. IfthereisnoFulloffsetspecified,PAFA(PAFB)willgoLOWatFull-7words. PAFA(PAFB)issynchronizedwithrespecttotheLOW-to-HIGHtransition oftheWriteClockWCLKA(WCLKB). ProgrammableAlmost–EmptyFlag(PAEA,PAEB)—PAEA(PAEB)will go LOW when the read pointer is "n+1" locations less than the write pointer. Theoffset"n"isdefinedintheEmptyOffsetRegisters. Ifnoreadsareperformed after reset, PAEA (PAEB) will go HIGH after "n+1" writes to FIFO A (B). IfthereisnoEmptyoffsetspecified,PAEA(PAEB)willgoLOWatEmpty+7 words. PAEA(PAEB)issynchronizedwithrespecttotheLOW-to-HIGHtransition of the Read Clock RCLKA (RCLKB). Data Outputs (QA0 – QA8, QB0 – QB8 ) — QA0 - QA8 are the nine data outputs for memory array A, QB0 - QB8are the nine data outputs for memory array B. NUMBER OF WORDS IN ARRAY A FFA PAFA PAEA EFA NUMBER OF WORDS IN ARRAY B FFB PAFB PAEB EFB IDT72V801 IDT72V811 IDT72V821 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) to 255 (512-m)(2) to 511 (1,024-m)(2) to 1,023 H L H H 256 512 1,024 L L H H NOTES: 1. n = Empty Offset (n = 7 default value) 2. m = Full Offset (m = 7 default value) NUMBER OF WORDS IN ARRAY A FFA PAFA PAEA EFA NUMBER OF WORDS IN ARRAY B FFB PAFB PAEB EFB IDT72V831 IDT72V841 IDT72V851 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) to 2,047 (4,096-m)(2) to 4,095 (8,192-m)(2) to 8,191 H L H H 2,048 4,096 8,192 L L H H TABLE 1: STATUS FLAGS FOR A AND B FIFOS |
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