M58BW16F Datasheet, PDF (78/87 Pages) STMicroelectronics – 16 or 32 Mbit (x32, Boot Block, Burst) 3.3V supply Flash memories

Common Flash interface (CFI)
M58BW16F, M58BW32F
Appendix B Common Flash interface (CFI)
The common Flash interface is a JEDEC approved, standardized data structure that can be
read from the Flash memory device. It allows a system software to query the device to
determine various electrical and timing parameters, density information and functions
supported by the memory. The system can interface easily with the device, enabling the
software to upgrade itself when necessary.
When the CFI Query command (RCFI) is issued the device enters CFI Query mode and the
data structure is read from the memory. Table 28, Table 29, Table 30, Table 33 and Table 32
show the addresses used to retrieve the data.
Table 28. Query structure overview
Offset
Sub-section name
Description
00h 0020h
883A
01h
8839
8838
8837
10h CFI query identification string
1Bh System interface information
27h Device geometry definition
P(h)⁽¹⁾
Primary algorithm-specific extended query
table
A(h)⁽²⁾
Alternate algorithm-specific extended query
table
Manufacturer code Numonyx
Device code
M58BW16FT (top)
M58BW16FB (bottom)
M58BW32FT (top)
M58BW32FB (bottom)
Command set ID and algorithm data offset
Device timing and voltage information
Flash memory layout
Additional information specific to the
primary algorithm (optional)
Additional information specific to the
alternate algorithm (optional)
1. Offset 15h defines P which points to the primary algorithm extended query address table.
2. Offset 19h defines A which points to the alternate algorithm extended query address table.
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