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SN74ALVC7805DL 데이터시트(PDF) 8 Page - Texas Instruments |
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SN74ALVC7805DL 데이터시트(HTML) 8 Page - Texas Instruments |
8 / 14 page SN74ALVC7805 256 × 18 LOW-POWER CLOCKED FIRST-IN, FIRST-OUT MEMORY SCAS593A – OCTOBER 1997 – REVISED APRIL 1998 8 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 = 32 are used. The AF/AE flag is high when the FIFO contains X or fewer words or (256 – 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. On the following low-to-high transition of WRTCLK, 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 WRTCLK reprograms Y to the binary value on D0–D7 at the time of the second WRTCLK low-to-high transition. When the offsets are being programmed, writes to the FIFO memory are disabled, regardless of the state of the write enables (WRTEN1, WRTEN2). A maximum value of 127 can be programmed for either X or Y (see Figure 4). To use the default values of X = Y = 32, PEN must be held high. 34 RESET WRTCLK PEN WRTEN1 WRTEN2 D0–D7 IR X and Y Y Figure 4. Programming X and Y Separately |
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