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SN74ALVC7804 Datasheet(PDF) 3 Page - Texas Instruments |
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SN74ALVC7804 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 13 page SN74ALVC7804 512 × 18 FIRST-IN, FIRST-OUT MEMORY SCAS432 – JANUARY 1995 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 functional block diagram Q0 – Q17 AF/AE HF OE D0 – D17 UNCK LDCK RESET PEN EMPTY FULL Status- Flag Logic Read Pointer Reset Logic 512 × 18 Write Pointer RAM Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION AF/AE 24 O Almost full/almost empty flag. Depth offset values can be programmed for AF/AE, or the default value of 64 can be used for both the almost empty offset (X) and the almost full offset (Y). AF/AE is high when memory contains X or less words or (512 – Y) or more words. AF/AE is high after reset. D0 – D17 21 – 14, 12 – 11, 9–2 I 18-bit data input port EMPTY 29 O Empty flag. EMPTY is low when the FIFO is empty. A FIFO reset also causes EMPTY to go low. FULL 28 O Full flag. FULL is low when the FIFO is full. A FIFO reset causes FULL to go high. HF 22 O Half-full flag. HF is high when the FIFO memory contains 256 or more words. HF is low after reset. LDCK 25 I Load clock. Data is written to the FIFO on the rising edge of LDCK when FULL is high. OE 56 I Output enable. When OE is high, the data outputs are in the high-impedance state. PEN 23 I Program enable. After reset and before the first word is written to the FIFO, the binary value on D0 – D7 is latched as an AF/AE offset value when PEN is low and WRTCLK is high. Q0 – Q17 33 – 34, 36 – 38, 40 – 43, 45 – 49, 51, 53 – 55 O 18-bit data output port RESET 1 I Reset. A low level on RESET resets the FIFO and drives AF/AE and FULL high and HF and EMPTY low. UNCK 32 I Unload clock. Data is read from the FIFO on the rising edge of UNCK when EMPTY is high. |
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