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EN25S20A Datasheet(PDF) 27 Page - Eon Silicon Solution Inc.

Part No. EN25S20A
Description  2 Megabit 1.8V Serial Flash Memory with 4Kbyte Uniform Sector
Download  65 Pages
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Maker  EON [Eon Silicon Solution Inc.]
Homepage  http://www.essi.com.tw
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EN25S20A Datasheet(HTML) 27 Page - Eon Silicon Solution Inc.

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This Data Sheet may be revised by subsequent versions
©2014 Eon Silicon Solution, Inc.,
www.eonssi.com
or modifications due to changes in technical specifications.
27
EN25S20A
Rev. A, Issue Date: 2014/01/16
Figure 17.1. Quad Input / Output Fast Read Instruction Sequence in QPI Mode
Another sequence of issuing Quad Input/Output FAST_READ (EBh) instruction especially useful in
random access is : CS# goes low -> sending Quad Input/Output FAST_READ (EBh) instruction -> 24-
bit address interleave on DQ3, DQ2, DQ1 and DQ0 -> performance enhance toggling bit P[7:0] -> 4
dummy clocks -> data out interleave on DQ3, DQ2, DQ1 and DQ0 till CS# goes high -> CS# goes low
(reduce Quad Input/Output FAST_READ (EBh) instruction) -> 24-bit random access address, as shown
in Figure 18.
In the performance – enhancing mode, P[7:4] must be toggling with P[3:0] ; likewise P[7:0] = A5h, 5Ah,
F0h or 0Fh can make this mode continue and reduce the next Quad Input/Output FAST_READ (EBh)
instruction. Once P[7:4] is no longer toggling with P[3:0] ; likewise P[7:0] = FFh, 00h, AAh or 55h. These
commands will reset the performance enhance mode. And afterwards CS# is raised or issuing FFh
command (CS# goes high -> CS# goes low -> sending FFh -> CS# goes high) instead of no toggling,
the system then will escape from performance enhance mode and return to normal operation.
While Program/ Erase/ Write Status Register is in progress, Quad Input/Output FAST_READ (EBh)
instruction is rejected without impact on the Program/ Erase/ Write Status Register current cycle.
The instruction sequence is shown in Figure 18.1 while using the Enable Quad Peripheral Interface
mode (EQPI) (38h) command.


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