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SN74ACT2226, SN74ACT2228 DUAL 64 × 1, DUAL 256 × 1 CLOCKED FIRST-IN, FIRST-OUT MEMORIES SCAS219C – JUNE 1992 – REVISED OCTOBER 1997 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 B1 C B A B10 B4 B3 B2 B1 IR HF AF/AE OR Q RDEN RDCLK D WRTEN WRTCLK RESET 1 0 1 0 1 0 3 2 1 DATA BIT NUMBER BASED ON FIFO DEPTH DEVICE DATA BIT DEVICE A B C SN74ACT2226 B33 B57 B65 SN74ACT2228 B129 B249 B257 Figure 2. FIFO Write |