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CY7C25652KV18-450BZI Datasheet(PDF) 9 Page - Cypress Semiconductor |
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CY7C25652KV18-450BZI Datasheet(HTML) 9 Page - Cypress Semiconductor |
9 / 31 page CY7C25632KV18 CY7C25652KV18 Document Number: 001-66482 Rev. *C Page 9 of 31 Truth Table The truth table for CY7C25632KV18, and CY7C25652KV18 follows. [4, 5, 6, 7, 8, 9] Operation K RPS WPS DQ DQ DQ DQ Write Cycle: Load address on the rising edge of K; input write data on two consecutive K and K rising edges. L–H H [10] L [11] D(A) at K(t + 1) D(A + 1) at K(t + 1) D(A + 2) at K(t + 2) D(A + 3) at K(t + 2) Read Cycle: (2.5 cycle Latency) Load address on the rising edge of K; wait two and half cycles; read data on two consecutive K and K rising edges. L–H L [11] X Q(A) at K(t + 2) Q(A + 1) at K(t + 3) Q(A + 2) at K(t + 3) Q(A + 3) at K(t + 4) NOP: No Operation L–H H H D = X Q = High Z D = X Q = High Z D = X Q = High Z D = X Q = High Z Standby: Clock Stopped Stopped X X Previous State Previous State Previous State Previous State Notes 4. X = “Don't Care,” H = Logic HIGH, L = Logic LOW, represents rising edge. 5. Device powers up deselected with the outputs in a tri-state condition. 6. “A” represents address location latched by the devices when transaction was initiated. A + 1, A + 2, and A + 3 represents the address sequence in the burst. 7. “t” represents the cycle at which a read/write operation is started. t + 1, t + 2, and t + 3 are the first, second and third clock cycles respectively succeeding the “t” clock cycle. 8. Data inputs are registered at K and K rising edges. Data outputs are delivered on K and K rising edges as well. 9. Ensure that when clock is stopped K = K and C = C = HIGH. This is not essential, but permits most rapid restart by overcoming transmission line charging symmetrically. 10. If this signal was LOW to initiate the previous cycle, this signal becomes a “Don’t Care” for this operation. 11. This signal was HIGH on previous K clock rise. Initiating consecutive read or write operations on consecutive K clock rises is not permitted. The device ignores the second read or write request. |
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