M36DR432BD ST Microelectronics, M36DR432BD Datasheet - Page 48

• Manufacturer Part Number: M36DR432BD
• Description: 32 Mbit 2Mb x16 / Dual Bank / Page Flash Memory and 4 Mbit 256Kb x16 SRAM / Multiple Memory Product
• Manufacturer: ST Microelectronics

M36DR432AD, M36DR432BD
APPENDIX B. COMMON FLASH INTERFACE
The Common Flash Interface is a JEDEC ap-
proved, 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 mem-
ory. The system can interface easily with the de-
vice, 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
Table 32. Query Structure Overview
Table 33. CFI Query Identification String
48/52
Offset
02h-0Fh
1Bh
00h
10h
27h
Offset
P
A
1Ah
00h
01h
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
Reserved
CFI Query Identification String
System Interface Information
Device Geometry Definition
Primary Algorithm-specific Extended Query table
Alternate Algorithm-specific Extended Query table
offset = P = 0040h
value = A = 0000h
00A1h - bottom
00A0h - top
reserved
0020h
0051h
0052h
0059h
0002h
0000h
0000h
0000h
0000h
0000h
Data
Sub-section Name
Manufacturer Code
Device Code
Reserved
Query Unique ASCII String "QRY"
Query Unique ASCII String "QRY"
Query Unique ASCII String "QRY"
Primary Algorithm Command Set and Control Interface ID code 16 bit ID code
defining a specific algorithm
Address for Primary Algorithm extended Query table
Alternate Vendor Command Set and Control Interface ID Code second vendor
- specified algorithm supported (note: 0000h means none exists)
Address for Alternate Algorithm extended Query table
note: 0000h means none exists
structure is read from the memory. Tables 32, 33,
34 and 35 show the address used to retrieve each
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 contains also a security
area starting at address 81h. This area can be ac-
cessed only in read mode and it is impossible to
change after it has been written by ST. Issue a
Read command to return to Read mode.
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)
Description
Description