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IDT70125S55J Datasheet(PDF) 10 Page - Integrated Device Technology |
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IDT70125S55J Datasheet(HTML) 10 Page - Integrated Device Technology |
10 / 12 page 6.10 10 IDT 70121/70125S/L HIGH-SPEED 2K x 9 DUAL-PORT STATIC RAM WITH BUSY & INTERRUPT COMMERCIAL TEMPERATURE RANGE tINS ADDR'A' INT'B' INTERRUPT SET ADDRESS tWC tAS R/ W'A' tWR 2654 drw 14 (2) (3) (3) (4) NOTES:. 1. All timing is the same for left and right ports. Port 'A' may be either left or right port. Port 'B' is the opposite from port 'A'. 2. See Interupt Truth Table. 3. Timing depends on which enable signal ( CE or R/W) is asserted last. 4. Timing depends on which enable signal ( CE or R/W) is de-asserted first. TIMING WAVEFORM OF INTERRUPT MODE TRUTH TABLES TRUTH TABLE II – INTERRUPT FLAG(1,4) Left Port Right Port R/ W W W W WL CE CE CE CE CEL OE OE OE OE OEL A0L – A10L INT INT INT INT INTL R/ W W W W WR CE CE CE CE CER OE OE OE OE OER A0L – A10R INT INT INT INT INTR Function L L X 7FF XXXX X L (2) Set Right INTR Flag X X X X X X L L 7FF H (3) Reset Right INTR Flag XXX X L (3) L L X 7FE X Set Left INTL Flag X L L 7FE H (2) X X X X X Reset Left INTL Flag NOTES: 2654 tbl 13 1. Assumes BUSYL = BUSYR = VIH 2. If BUSYL = VIL, then No Change. 3. If BUSYR = VIL, then No Change. 4. 'H' = VIH,' L' = VIL,' X' = DON’T CARE. TRUTH TABLE I – NON-CONTENTION READ/WRITE CONTROL(4) Left or Right Port(1) R/ W W W W W CE CE CE CE CE OE OE OE OE OE D0–8 Function X H X Z Port Disabled and in Power- Down Mode, ISB2 or ISB4 XH X Z CER = CEL = H, Power-Down Mode, ISB1 or ISB3 L L X DATAIN Data on Port Written Into Memory (2) H L L DATAOUT Data in Memory Output on Port (3) H L H Z High-impedance Outputs NOTES: 2654 tbl 12 1. A0L – A10L ≠ A0R – A10R. 2. If BUSY = VIL, data is not written. 3. If BUSY = VIL, data may not be valid, see tWDD and tDDD timing. 4. 'H' = VIH, 'L' = VIL, 'X' = DON’T CARE, 'Z' = High-impedance. |
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