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LH540203D-15 Datasheet(PDF) 7 Page - Sharp Corporation |
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LH540203D-15 Datasheet(HTML) 7 Page - Sharp Corporation |
7 / 17 page OPERATIONAL MODES (cont’d) Compound FIFO Expansion A combination of word-width expansion and depth cascading may be implemented easily by operating groups of depth-cascaded FIFOs in parallel. Bidirectional FIFO Operation Bidirectional data buffering between two systems may be implemented by operating LH540203 devices in par- allel, but in opposite directions. The Data In inputs of each LH540203 are tied to the corresponding Data Out outputs of another LH540203, which is operating in the opposite direction, to form a single bidirectional bus interface. Care must be taken to assure that the appropriate read, write, and flag signals are routed to each system. Both word- width expansion and depth cascading may be used in bidirectional applications. LH540203 DEPTH EXPANSION BLOCK LH540203 DEPTH EXPANSION BLOCK LH540203 DEPTH EXPANSION BLOCK Q0 - Q8 DATA OUT DN-9 - DN-1 D18 - DN-1 D9 - DN-1 D0 - DN-1 DATA IN R W RS Q0 - QN-1 Q0 - Q17 540203-20 ARRAY STORES N-BIT WORDS. Q0 - QN-10 Figure 7. Compound FIFO Expansion LH540203 LH540203 SYSTEM A SYSTEM B Qb0 - 8 Db0 - 8 Da0 - 8 Qa0 - 8 XI Wb Ra EFa HFa RTa RS FFb RTb HFb EFb Rb 540203-21 XI Wa FFa RS Figure 8. Bidirectional FIFO Operation (2048 × 9 × 2) CMOS 2048 × 9 Asynchronous FIFO LH540203 7 |
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