S29GL128S SPANSION [SPANSION], S29GL128S Datasheet - Page 15

• Manufacturer Part Number: S29GL128S
• Manufacturer: SPANSION [SPANSION]

2.3
March 16, 2012 S29GL_128S_01GS_00_06
2.2.1
2.2.2
Status Register ASO
Device ID
Common Flash Memory Interface
The Joint Electron Device Engineering Council (JEDEC) standard JEP106T defines the manufacturer ID for a
compliant memory. Common industry usage defined a method and format for reading the manufacturer ID
and a device specific ID from a memory device. The manufacturer and device ID information is primarily
intended for programming equipment to automatically match a device with the corresponding programming
algorithm. Spansion has added additional fields within this 32-byte address space.
The original industry format was structured to work with any memory data bus width e. g. x8, x16, x32. The ID
code values are traditionally byte wide but are located at bus width address boundaries such that
incrementing the device address inputs will read successive byte, word, or double word locations with the ID
codes always located in the least significant byte location of the data bus. Because the device data bus is
word wide each code byte is located in the lower half of each word location. The original industry format made
the high order byte always 0. Spansion has modified the format to use both bytes in some words of the
address space. For the detail description of the Device ID address map see
The JEDEC Common Flash Interface (CFI) specification (JESD68.01) defines a standardized data structure
that may be read from a flash memory device, which allows vendor-specified software algorithms to be used
for entire families of devices. The data structure contains information for system configuration such as various
electrical and timing parameters, and special functions supported by the device. Software support can then
be device-independent, Device ID-independent, and forward-and-backward-compatible for entire Flash
device families.
The system can read CFI information at the addresses within the selected sector as shown in
Common Flash Interface (ID-CFI) ASO Map on page
Like the Device ID information, CFI information is structured to work with any memory data bus width e. g. x8,
x16, x32. The code values are always byte wide but are located at data bus width address boundaries such
that incrementing the device address reads successive byte, word, or double word locations with the codes
always located in the least significant byte location of the data bus. Because the data bus is word wide each
code byte is located in the lower half of each word location and the high order byte is always 0.
For further information, please refer to the Spansion CFI Specification, Version 1.4 (or later), and the JEDEC
publications JEP137-A and JESD68.01. Please contact JEDEC (http://www.jedec.org/) for their standards
and the Spansion CFI Specification may be found at the Spansion Web site
(http://www.spansion.com/Support/TechnicalDocuments/Pages/ApplicationNotes.aspx
document's publication) or by contacting a local Spansion sales office listed on the web site.
The Status register ASO contains a single word of registered volatile status for Embedded Algorithms. When
the Status Register read command is issued, the current status is captured by the register and the ASO is
entered. The Status Register content appears at all word locations in the device address space. However, it is
recommended to read the status only at word location 0 for future compatibility. The first read access in the
Status Register ASO exits the ASO and returns to the address space map in use when the Status Register
read command was issued.
D a t a
GL-S MirrorBit
S h e e t
®
Family
60.
Table 6.2 on page
at the time of this
Device ID and
60.
15