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SN74ACT7807-15PM Folha de dados(PDF) 6 Page - Texas Instruments |
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SN74ACT7807-15PM Folha de dados(HTML) 6 Page - Texas Instruments |
6 / 19 page SN74ACT7807 2048 × 9 CLOCKED FIRST-IN, FIRST-OUT MEMORY SCAS200D – JANUARY 1991 – REVISED APRIL 1998 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 offset values for AF/AE The AF/AE flag has two programmable limits: the almost-empty offset value (X) and the almost-full offset value (Y). They can be programmed after the FIFO is reset and before the first word is written to memory. If the offsets are not programmed, the default values of X = Y = 256 are used. The AF/AE flag is high when the FIFO contains X or fewer words or (2048 – Y) or more words. Program enable (PEN) should be held high throughout the reset cycle. PEN can be brought low only when IR is high and WRTCLK is low. On the following low-to-high transition of WRTCLK, the binary value on D0–D8 and WRTEN1/DP9 is stored as the almost-empty offset value (X) and the almost-full offset value (Y). Holding PEN low for another low-to-high transition of WRTCLK reprograms Y to the binary value on D0–D8 and WRTEN1/DP9 at the time of the second WRTCLK low-to-high transition. While the offsets are programmed, data is not written to the FIFO memory, regardless of the state of the write enables (WRTEN1/DP9, WRTEN2). A maximum value of 1023 can be programmed for either X or Y (see Figure 1). To use the default values of X = Y = 256, PEN must be held high. X and Y MSB 34 RESET PEN D0–D8 WRTCLK WRTEN1/DP9 WRTEN2 IR X and Y Y YMSB Word 1 Figure 1. Programming X and Y Separately |
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