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SN74ACT7204L Datasheet(PDF) 6 Page - Texas Instruments |
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SN74ACT7204L Datasheet(HTML) 6 Page - Texas Instruments |
6 / 22 page SN74ACT7203L, SN74ACT7204L, SN74ACT7205L, SN74ACT7206L 2048 × 9, 4096 × 9, 8192 × 9, 16384 × 9 ASYNCHRONOUS FIRST IN, FIRST OUT MEMORIES SCAS226A − FEBRUARY 1993 − REVISED SEPTEMBER 1995 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 functional block diagram Read Pointer Location 1 Location 2 2048 × 9 or 4096 × 9 or 8192 × 9 or 16384 × 9 • Write Pointer Write Control Reset Logic Read Control Status- Flag Logic Expansion Logic RS W XI FL /RT R D0 − D8 Q0 − Q8 FF EF XO/HF • 9 9 RAM† † 2048 × 9 for SN74ACT7203L; 4096 × 9 for SN74ACT7204L; 8192 × 9 for SN74ACT7205L; 16384 × 9 for SN74ACT7206L RESET AND RETRANSMIT FUNCTION TABLE (single-device depth; single-or multiple-device width) INPUTS INTERNAL TO DEVICE OUTPUTS FUNCTION RS FL/RT XI READ POINTER WRITE POINTER EF FF XO/HF FUNCTION L X L Location zero Location zero L H H Reset device H L L Location zero Unchanged X X X Retransmit H H L Increment if EF high Increment if FF high X X X Read/write RESET AND FIRST- LOAD FUNCTION TABLE (multiple-device depth; single-or multiple-device width) INPUTS INTERNAL TO DEVICE OUTPUTS FUNCTION RS FL/RT XI READ POINTER WRITE POINTER EF FF FUNCTION L L ‡ Location zero Location zero L H Reset first device L H ‡ Location zero Location zero L H Reset all other devices H X ‡ X X X X Read/write ‡ XI is connected to XO/HF of the previous device in the daisy chain (see Figure 15). |
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