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CY7C421 Datasheet(PDF) 10 Page - Cypress Semiconductor |
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CY7C421 Datasheet(HTML) 10 Page - Cypress Semiconductor |
10 / 21 page CY7C421 Document Number: 38-06001 Rev. *H Page 10 of 21 Figure 8. Last Write to First Read Full Flag Figure 9. Last Read to First Write Empty Flag Figure 10. Retransmit [11] Switching Waveforms (continued) LAST WRITE FIRST READ ADDITIONAL READS FIRST WRITE tWFF tRFF R W FF VALID LAST READ FIRST WRITE ADDITIONAL WRITES FIRST READ VALID tREF tWEF tA W R EF Q0–Q8 tRTC tPRT tRTR FL/RT R,W [12] Notes 11. EF, HF and FF may change state during retransmit as a result of the offset of the read and write pointers, but flags are valid at tRTC. 12. tRTC = tPRT + tRTR. |
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