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EN25S20A Datasheet(PDF) 6 Page - Eon Silicon Solution Inc.

Part No. EN25S20A
Description  2 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
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EN25S20A Datasheet(HTML) 6 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.
6
EN25S20A
Rev. A, Issue Date: 2014/01/16
OPERATING FEATURES
Standard SPI Modes
The EN25S20A is accessed through an SPI compatible bus consisting of four signals: Serial Clock
(CLK), Chip Select (CS#), Serial Data Input (DI) and Serial Data Output (DO). Both SPI bus operation
Modes 0 (0,0) and 3 (1,1) are supported. The primary difference between Mode 0 and Mode 3, as
shown in Figure 3, concerns the normal state of the CLK signal when the SPI bus master is in standby
and data is not being transferred to the Serial Flash. For Mode 0 the CLK signal is normally low. For
Mode 3 the CLK signal is normally high. In either case data input on the DI pin is sampled on the rising
edge of the CLK. Data output on the DO pin is clocked out on the falling edge of CLK.
Figure 3. SPI Modes
Dual SPI Instruction
The EN25S20A supports Dual SPI operation when using the “ Dual Output Fast Read and Dual I/ O
FAST_READ “ (3Bh and BBh) instructions. These instructions allow data to be transferred to or from
the Serial Flash memory at two to three times the rate possible with the standard SPI. The Dual Read
instructions are ideal for quickly downloading code from Flash to RAM upon power-up (code-shadowing)
or for application that cache code-segments to RAM for execution. The Dual output feature simply
allows the SPI input pin to also serve as an output during this instruction. When using Dual SPI
instructions the DI and DO pins become bidirectional I/O pins; DQ0 and DQ1. All other operations use
the standard SPI interface with single output signal.
Quad I/O SPI Modes
The EN25S20A supports Quad input / output operation when using the Quad I/O Fast Read (EBh).This
instruction allows data to be transferred to or from the Serial Flash memory at four to six times the rate
possible with the standard SPI. The Quad Read instruction offer a significant improvement in
continuous and random access transfer rates allowing fast code-shadowing to RAM or for application
that cache code-segments to RAM for execution. When using Quad SPI instruction the DI and DO pins
become bidirectional I/O pins; DQ0 and DQ1, and the WP# and HOLD# pins become DQ2 and DQ3
respectively.


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