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S70FS01GS датащи(PDF) 38 Page - Cypress Semiconductor

номер детали S70FS01GS
подробное описание детали  1-Gbit (128 MByte), 1.8 V FS-S Flash
PDF  141 Pages
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производитель  CYPRESS [Cypress Semiconductor]
домашняя страница  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

S70FS01GS датащи(HTML) 38 Page - Cypress Semiconductor

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S70FS01GS
Document Number: 002-03833 Rev. *C
Page 38 of 141
5.5.3.1
Data Learning Pattern Minimum Window
The minimum data valid window (tDV) can be calculated as follows:
As an example, assuming: 80 MHz clock frequency = 12.5 ns clock period with DDR operations are specified to have a duty cycle of
45% or higher.
tCLH = 0.45*PSCK = 0.45 x 12.5ns = 5.625ns
tO_SKEW = 600ps
tOTT = 1.0ns
tDV = tCLH - tO_SKEW - tOTT
–tDV = 5.625ns - 600ps - 1.0ns = 4.025ns
tV _min = tHO + tO_SKEW + tOTT
–tV _min = 1.0 ns + 600ps + 1.0 ns = 2.6 ns



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