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SN74ACT7200L35RJ Arkusz danych(PDF) 5 Page - Texas Instruments |
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SN74ACT7200L35RJ Arkusz danych(HTML) 5 Page - Texas Instruments |
5 / 23 page SN74ACT7200L, SN74ACT7201LA, SN74ACT7202LA 256 × 9, 512 × 9, 1024 × 9 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORIES SCAS221A – FEBRUARY 1993 – REVISED SEPTEMBER 1995 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 functional block diagram Read Pointer Location 1 Location 2 256 × 9 or 512 × 9 or 1024 × 9 RAM • 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 † 256 × 9 for SN74ACT7200L; 512 × 9 for SN74ACT7201LA; 1024 × 9 for SN74ACT7202LA 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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