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SN74ACT7804 Datasheet(PDF) 4 Page - Texas Instruments |
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SN74ACT7804 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 11 page SN74ACT7804 512 × 18 STROBED FIRST-IN, FIRST-OUT MEMORY SCAS204C – APRIL 1992 – REVISED APRIL 1998 4 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. The AF/AE flag is high when the FIFO contains X or fewer words or (512 – Y) or more words. To program the offset values, 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–D7 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–D7 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 255 can be programmed for either X or Y (see Figure 1). To use the default values of X = Y = 64, PEN must be held high. RESET X and Y Y PEN D0–D7 EMPTY Don’t Care LDCK Don’t Care Figure 1. Programming X and Y Separately |
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