M58LR128HT Datasheet, PDF (83/112 Pages) STMicroelectronics – 128 Mbit (8 Mb ×16, Multiple Bank, Multilevel interface, Burst) 1.8 V supply Flash memories

M58LR128HT, M58LR128HB
Appendix B Common Flash Interface
Common Flash Interface
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 Read CFI Query Command is issued the device enters CFI Query mode and the
data structure is read from the memory. Tables 32, 33, 34, 35, 36, 37, 38, 39, 40 and 41
show the addresses used to retrieve the data. The Query data is always presented on the
lowest order data outputs (DQ0-DQ7), the other outputs (DQ8-DQ15) are set to 0.
The CFI data structure also contains a security area where a 64 bit unique security number
is written (see Figure 4: Protection Register memory map). This area can be accessed only
in Read mode by the final user. It is impossible to change the security number after it has
been written by ST. Issue a Read Array command to return to Read mode.
Table 32. Query structure overview
Offset
Sub-section Name
Description
000h Reserved
010h CFI Query Identification String
01Bh System Interface Information
027h Device Geometry Definition
P
Primary Algorithm-specific Extended
Query table
A
Alternate Algorithm-specific Extended
Query table
080h Security Code Area
Reserved for algorithm-specific information
Command set ID and algorithm data offset
Device timing & voltage information
Flash device layout
Additional information specific to the Primary
Algorithm (optional)
Additional information specific to the Alternate
Algorithm (optional)
Lock Protection Register
Unique device Number and
User Programmable OTP
1. The Flash memory display the CFI data structure when CFI Query command is issued. In this table are
listed the main sub-sections detailed in Tables 33, 34, 35 and 36. Query data is always presented on the
lowest order data outputs.
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