EN25S40A Datasheet, PDF (35/68 Pages) Eon Silicon Solution Inc. – 4 Megabit 1.8V Serial Flash Memory with 4Kbyte Uniform Sector

EN25S40A
Quad Input Page Program (QPP) (32h)
The Quad Page Program (QPP) instruction allows up to 256 bytes of data to be programmed at
previously erased (FFh) memory locations using four pins: DQ₀, DQ₁, DQ₂ and DQ₃. The Quad Page
Program can improve performance for PROM Programmer and applications that have slow clock
speeds < 5MHz. Systems with faster clock speed will not realize much benefit for the Quad Page
Program instruction since the inherent page program time is much greater than the time it take to clock-
in the data.
A Write Enable instruction must be executed before the device will accept the Quad Page Program
(QPP) instruction (Status Register-1, WEL=1). The instruction is initiated by driving the CS# pin low
then shifting the instruction code “32h” followed by a 24-bit address (A23-A0) and at least one data byte,
into the IO pins. The CS# pin must be held low for the entire length of the instruction while data is being
sent to the device. All other functions of Quad Page Program (QPP) are identical to standard Page
Program. The Quad Page Program (QPP) instruction sequence is shown in Figure 22.
Figure 22. Quad Input Page Program Instruction Sequence Diagram (SPI Mode only)
This Data Sheet may be revised by subsequent versions
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or modifications due to changes in technical specifications.
©2013 Eon Silicon Solution, Inc.,
Rev. A, Issue Date: 2013/12/30
www.eonssi.com