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SN74ACT7811FN bảng dữ liệu(PDF) 6 Page - Texas Instruments |
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SN74ACT7811FN bảng dữ liệu(HTML) 6 Page - Texas Instruments |
6 / 17 page SN74ACT7811 1024 × 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY SCAS151C – JANUARY 1991 – REVISED FEBRUARY 1996 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions (Continued) TERMINAL† I/O DESCRIPTION NAME NO. I/O DESCRIPTION WRTCLK 29 I Write clock. Data is written into memory on a low-to-high transition of WRTCLK if IR, WRTEN1, and WRTEN2 are high. WRTCLK is a free-running clock and functions as the synchronizing clock for all data transfers into the FIFO. IR is also driven synchronously with respect to WRTCLK. WRTEN1, WRTEN2 30 31 I Write enables. WRTEN1 and WRTEN2 must be high before a rising edge on WRTCLK for a word to be written into memory. WRTEN1 and WRTEN2 do not affect the storage of the almost-full/almost-empty offset value (X). † Terminals listed are for the FN package. 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 HF OE 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 Don’t Care RESET DAF 1 0 † 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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