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LH543601 Datasheet(PDF) 40 Page - Sharp Corporation |
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LH543601 Datasheet(HTML) 40 Page - Sharp Corporation |
40 / 43 page ![]() TIMING DIAGRAMS (cont’d) t RQS t ACK t AE t ACK t ACK t ACK B (CK ) B (R/W ) B (REQ ) B (ACK ) (AE1) A CK A R/W A REQ A ACK AE2 RWS t Starting at the third cycle after entering the 'almost-empty' region, acknowledge occurs on every third cycle to prevent underrun of the empty condition. Outside the 'almost-empty' region, acknowledge is continuous for a continuous request. * Indicates where a read would take place, if ACK were tied to EN. NOTES: 1. For a FIFO access to occur, REQ and EN must be held HIGH for the required setup and hold times. 2. ACK can be tied directly to EN to directly gate FIFO accesses. 3. REQ must be maintained HIGH throughout the entire clock cycle for ACK to be generated. 4. When the REQ/ACK handshake is not used, ACK can be ignored, and REQ may be tied HIGH or used as a second enable. 5. Parameters without parentheses apply to Port A. Parameters with parentheses apply to Port B. * * ** * 543601-9 1 2 Figure 31. Read Request/Acknowledge Handshake LH543601 256 × 36 × 2 Bidirectional FIFO 40 |
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