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IDT72201L50PF Datasheet(PDF) 8 Page - Integrated Device Technology |
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IDT72201L50PF Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 19 page 5.07 8 IDT72421/72201/72211/72221/72231/72241 CMOS SyncFIFO ™ 64 x 9, 256 x 9, 512 x 9, 1024 x 9, 2048 x 9 and 4096 x 9 MILITARY AND COMMERCIAL TEMPERATURE RANGES OUTPUTS: Full Flag ( FF FF) — The Full Flag (FF) will go LOW, inhibiting further write operation, when the device is full. If no reads are performed after Reset ( RS), the Full Flag (FF) will go LOW after 64 writes for the IDT72421, 256 writes for the IDT72201, 512 writes for the IDT72211, 1024 writes for the IDT72221, 2048 writes for the IDT72231, and 4096 writes for the IDT72241. The Full Flag ( FF) is synchronized with respect to the LOW- to-HIGH transition of the write clock (WCLK). Empty Flag ( EF EF) — The Empty Flag (EF) will go LOW, inhibiting further read operations, 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 PAF) — The Programmable Almost-Full Flag ( PAF) will go LOW when the FIFO reaches the Almost-Full condition. If no reads are performed after Reset ( RS), the Programmable Almost-Full Flag ( PAF) will go LOW after (64-m) writes for the IDT72421, (256-m) writes for the IDT72201, (512-m) writes for the IDT72211, (1024-m) writes for the IDT72221, (2048-m) writes for the IDT72231, and (4096-m) writes for the IDT72241. The offset “m” is defined in the Full offset registers. If there is no Full offset specified, the Programmable Almost-Full Flag ( PAF) will go LOW at Full-7 words. The Programmable Almost-Full Flag ( PAF) is synchronized with respect to the LOW-to-HIGH transition of the write clock (WCLK). Programmable Almost-Empty Flag ( PAE PAE) — The Programmable Almost-Empty Flag ( PAE) will go LOW when the read 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. If there is no Empty offset specified, the Programmable Almost-Empty Flag ( PAE) will go LOW at Empty+7 words. The Programmable Almost-Empty Flag ( PAE) is synchronized with respect to the LOW-to-HIGH transition of the read clock (RCLK). Data Outputs (Q0 - Q8) — Data outputs for a 9-bit wide data. TABLE 1: STATUS FLAGS NUMBER OF WORDS IN FIFO 72421 72201 72211 FF FF PAF PAF PAE PAE EF 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)) HHHH (64-m) to 63 (256-m) to 255 (512-m) to 511 H L H H 64 256 512 L L H H (1) (1) NUMBER OF WORDS IN FIFO 72221 72231 72241 FF FF PAF PAF PAE PAE EF 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 (1024-(m+1)) (n+1) to (2048-(m+1)) (n+1) to (4096-(m+1)) HHHH (1024-m) (2) to 1023 (2048-m) (2) to 2047 (4096-m) (2) to 4095 H L H H 1024 2048 4096 L L H H NOTES: 1. n = Empty Offset (n = 7 default value) 2. m = Full Offset (m = 7 default value) (1) (2) (2) (2) 2655 tbl 10 2655 tbl 11 |
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