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SN74ACT7808 Datasheet(PDF) 6 Page - Texas Instruments |
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SN74ACT7808 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 18 page ![]() SN74ACT7808 2048 × 9 STROBED FIRST-IN, FIRST-OUT MEMORY SCAS205E – FEBRUARY 1991 – REVISED NOVEMBER 2001 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. To program the offset values, program enable (PEN) can be brought low after reset only when LDCK is low. On the following low-to-high transition of LDCK, the binary value on D0–D8 and 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 LDCK reprograms Y to the binary value on D0–D8 and DP9 at the time of the second LDCK low-to-high transition. Writes to the FIFO memory are disabled while the offsets are programmed. 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. RESET X and Y Y PEN D0–D8 LDCK Don’t Care EMPTY X and Y MSB Y MSB Don’t Care DP9 Don’t Care Figure 1. Programming X and Y Separately |
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