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72V275L10PFGI Datasheet(PDF) 9 Page - Integrated Device Technology |
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72V275L10PFGI Datasheet(HTML) 9 Page - Integrated Device Technology |
9 / 25 page 9 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT72V275/72V285 3.3V CMOS SUPERSYNC FIFOTM 32,768 x 18 and 65,536 x 18 Figure 4. Programmable Flag Offset Programming Sequence Figure 3. Offset Register Location and Default Values NOTES: 1. The programming method can only be selected at Master Reset. 2. Parallel reading of the offset registers is always permitted regardless of which programming method has been selected. 3. The programming sequence applies to both IDT Standard and FWFT modes. WCLK RCLK X X XX X X XX 4512 drw 07 LD 0 0 X 1 1 1 0 WEN 0 1 1 0 X 1 1 REN 1 0 1 X 0 1 1 X SEN 1 1 1 X X X 0 72V275 72V285 Parallel write to registers: Empty Offset Full Offset Parallel read from registers: Empty Offset Full Offset No Operation Write Memory Read Memory No Operation Serial shift into registers: 30 bits for the 72V275 32 bits for the 72V285 1 bit for each rising WCLK edge Starting with Empty Offset (LSB) Ending with Full Offset (MSB) EMPTY OFFSET REGISTER 17 0 007FH if LD is LOW at Master Reset, 03FFH if LD is HIGH at Master Reset FULL OFFSET REGISTER 17 0 DEFAULT VALUE DEFAULT VALUE 007FH if LD is LOW at Master Reset, 03FFH if LD is HIGH at Master Reset 14 72V275 (32,768 x 18_BIT) 15 14 15 EMPTY OFFSET REGISTER 17 0 007FH if LD is LOW at Master Reset, 03FFH if LD is HIGH at Master Reset FULL OFFSET REGISTER 17 0 DEFAULT VALUE DEFAULT VALUE 007FH if LD is LOW at Master Reset, 03FFH if LD is HIGH at Master Reset 15 72V285 (65,536 x 18_BIT) 4512 drw 06 16 15 16 |
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