EN25S20A Datasheet, PDF (34/65 Pages) Eon Silicon Solution Inc. – 2 Megabit 1.8V Serial Flash Memory with 4Kbyte Uniform Sector

EN25S20A
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.
To use Quad Page Program (QPP) the WP# & Hold# Disable (WHDIS) bit in Status Register must be
set to 1. 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.
CS#
CLK
0 1 2 3 4 5 6 7 8 9 10
28 29 30 31
DQ0
DQ1
Command
32h
3 Address bytes
(24 clocks)
A23 A22 A21
*
A3 A2 A1 A0
DQ2
DQ3
CS#
CLK
DQ0
DQ1
* ^{= MSB}
31 32 33 34 35 36 37
Data
Byte
1
Data
Byte
2
Data
Byte
3
A0 D4 D0 D4 D0 D4 D0
D5 D1 D5 D1 D5 D1
534 535 536 537 538 539 540 541 542 543
Data
Byte
252
Data
Byte
253
Data
Byte
254
Data
Byte
255
Data
Byte
256
D4 D0 D4 D0 D4 D0 D4 D0 D4 D0
D5 D1 D5 D1 D5 D1 D5 D1 D5 D1
DQ2
DQ3
D6 D2 D6 D2 D6 D2
D7 D3 D7 D3 D7 D3
***
D6 D2 D6 D2 D6 D2 D6 D2 D6 D2
D7 D3 D7 D3 D7 D3 D7 D3 D7 D3
*****
Figure 22. Quad Input Page Program Instruction Sequence Diagram (SPI Mode only)
This Data Sheet may be revised by subsequent versions
34
or modifications due to changes in technical specifications.
©2014 Eon Silicon Solution, Inc.,
Rev. A, Issue Date: 2014/01/16
www.eonssi.com