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SN74ALVC7806-40DL Datasheet(PDF) 5 Page - Texas Instruments |
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SN74ALVC7806-40DL Datasheet(HTML) 5 Page - Texas Instruments |
5 / 10 page SN74ALVC7806 256 × 18 LOW-POWER FIRST-IN, FIRST-OUT MEMORY SCAS591A – OCTOBER 1997 – REVISED APRIL 1998 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 DATA-WORD NUMBERS FOR FLAG TRANSITIONS DEVICE TRANSITION WORD DEVICE A B C D E F G H I SN74ALVC7806 W128 W(256 – Y) W256 W129 W130 W(256 – X) W(257 – X) W255 W256 Figure 1. Write, Read, and Flag Timing Reference (Continued) 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 (256 – Y) or more words. To program the offset values, PEN can be brought low after reset. 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 127 can be programmed for either X or Y (see Figure 2). To use the default values of X = Y = 32, PEN must be held high. LDCK RESET X and Y Y PEN D0–D17 EMPTY Don’t Care Don’t Care Figure 1. Programming X and Y Separately |
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