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EN25S20A Datasheet(PDF) 45 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) 45 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.
45
EN25S20A
Rev. A, Issue Date: 2014/01/16
Read Manufacturer / Device ID (90h)
The Read Manufacturer/Device ID instruction is an alternative to the Release from Power-down /
Device ID instruction that provides both the JEDEC assigned manufacturer ID and the specific device
ID.
The Read Manufacturer/Device ID instruction is very similar to the Release from Power-down / Device
ID instruction. The instruction is initiated by driving the CS# pin low and shifting the instruction code
“90h” followed by a 24-bit address (A23-A0) of 000000h. After which, the Manufacturer ID for Eon (1Ch)
and the Device ID are shifted out on the falling edge of CLK with most significant bit (MSB) first as
shown in Figure 34. The Device ID values for the EN25S20A are listed in Table 6. If the 24-bit address
is initially set to 000001h the Device ID will be read first
The Read Manufacturer/Device ID (90h) instruction is available in Standard SPI Mode only.
Figure 34. Read Manufacturer / Device ID Diagram
Read Identification (RDID) (9Fh)
The Read Identification (RDID) instruction allows the 8-bit manufacturer identification to be read,
followed by two bytes of device identification. The device identification indicates the memory type in the
first byte , and the memory capacity of the device in the second byte .
Any Read Identification (RDID) instruction while an Erase or Program cycle is in progress, is not
decoded, and has no effect on the cycle that is in progress. The Read Identification (RDID) instruction
should not be issued while the device is in Deep Power down mode.
The device is first selected by driving Chip Select Low. Then, the 8-bit instruction code for the
instruction is shifted in. This is followed by the 24-bit device identification, stored in the memory, being
shifted out on Serial Data Output , each bit being shifted out during the falling edge of Serial Clock .


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