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SN74ACT7801-18FNR 데이터시트(PDF) 7 Page - Texas Instruments |
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SN74ACT7801-18FNR 데이터시트(HTML) 7 Page - Texas Instruments |
7 / 19 page SN74ACT7801 1024 × 18 CLOCKED FIRST IN, FIRST OUT MEMORY SCAS111 − D3489, APRIL 1990 − REVISED MAY 1991 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 timing diagrams DAF 12 3 4 1 2 12 3 4 Invalid WRTCLK WRTEN1 WRTEN2 D0 − D17 RDCLK RDEN1 RDEN2 Q0 − Q17 OR AF/AE IR Store the Value of D0 − D8 as X Define the AF/AE Flag Using the Value of X Don’t Care Don’t Care Don’t Care Don’t Care Don’t Care Don’t Care Don’t Care Don’t Care Don’t Care HF OE Don’t Care RESET X† † X is the binary value of D0 −D8 only. Figure 1. Reset Cycle: Define AF/AE Using the Value of X |
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