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EN25S40 Datasheet(PDF) 4 Page - Eon Silicon Solution Inc.

Part No. EN25S40
Description  4 Megabit 1.8V Serial Flash Memory with 4Kbyte Uniform Sector
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Maker  EON [Eon Silicon Solution Inc.]
Homepage  http://www.essi.com.tw

EN25S40 Datasheet(HTML) 4 Page - Eon Silicon Solution Inc.

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This Data Sheet may be revised by subsequent versions
©2004 Eon Silicon Solution, Inc.,
or modifications due to changes in technical specifications.
Rev. A, Issue Date: 2009/04/28
Serial Data Input, Output and IOs (DI, DO and DQ0, DQ1)
The EN25S40 support standard SPI and Dual SPI operation. Standard SPI instructions use the
unidirectional DI (input) pin to serially write instructions, addresses or data to the device on the rising
edge of the Serial Clock (CLK) input pin. Standard SPI also uses the unidirectional DO (output) to read
data or status from the device on the falling edge CLK.
Dual SPI instruction use the bidirectional IO pins to serially write instruction, addresses or data to the
device on the rising edge of CLK and read data or status from the device on the falling edge of CLK.
Serial Clock (CLK)
The SPI Serial Clock Input (CLK) pin provides the timing for serial input and output operations. ("See
SPI Mode")
Chip Select (CS#)
The SPI Chip Select (CS#) pin enables and disables device operation. When CS# is high the device is
deselected and the Serial Data Output (DO, or DQ0 and DQ1) pins are at high impedance. When
deselected, the devices power consumption will be at standby levels unless an internal erase, program
or status register cycle is in progress. When CS# is brought low the device will be selected, power
consumption will increase to active levels and instructions can be written to and data read from the
device. After power-up, CS# must transition from high to low before a new instruction will be accepted.
The HOLD# pin allows the device to be paused while it is actively selected. When HOLD# is brought
low, while CS# is low, the DO pin will be at high impedance and signals on the DI and CLK pins will be
ignored (don’t care). The HOLD# function can be useful when multiple devices are sharing the same
SPI signals.
Write Protect (WP#)
The Write Protect (WP#) pin can be used to prevent the Status Register from being written. Used in
conjunction with the Status Register’s Block Protect (BP0, BP1and BP2) bits and Status Register
Protect (SRP) bits, a portion or the entire memory array can be hardware protected.

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