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SN74ACT7806 Datasheet(PDF) 3 Page - Texas Instruments |
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SN74ACT7806 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 10 page ![]() SN74ACT7806 256 × 18 STROBED FIRST-IN, FIRST-OUT MEMORY SCAS438C – APRIL 1992 – REVISED APRIL 1998 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 Location 1 Location 2 Location 255 Location 256 256 × 18 SRAM Write Pointer 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 32 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 fewer words or (256 – Y) or more words. AF/AE is high after reset. D0–D17 2–9, 11–12, 12–14 I 18-bit data input port EMPTY 29 O Empty flag. EMPTY is high when the FIFO memory is not empty; EMPTY is low when the FIFO memory is empty or upon assertion of RESET. FULL 28 O Full flag. FULL is high when the FIFO memory is not full or upon assertion of RESET; FULL is low when the FIFO memory is full. HF 22 O Half-full flag. HF is high when the FIFO memory contains 128 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–D6 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 this input resets the FIFO and drives 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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