M28W320 STMicroelectronics, M28W320 Datasheet - Page 3

• Manufacturer Part Number: M28W320
• Description: 32 Mbit 2Mb x16/ Boot Block Low Voltage Flash Memory
• Manufacturer: STMicroelectronics

Table 2. Absolute Maximum Ratings
Note: 1. Except for the rating ”Operating Temperature Range”, stresses above those listed in the Table ”Absolute Maximum Ratings” may
DESCRIPTION
The M28W320C is a 32 Mbit non-volatile Flash
memory that can be erased electrically at the block
level and programmed in-system on a Word-by-
Word basis. The device is offered in the TSOP48
(10 x 20mm) and the BGA47, 0.75mm ball pitch
packages.
M28W320C are in the 1 state.
The array matrix organisation allows each block to
be erased and reprogrammed without affecting
other blocks. All blocks are protected against pro-
gramming and erase at Power UP. Blocks can be
unprotected to make changes in the application
and then reprotected. A parameter block ”Security
Block” can be permanently protected against pro-
gramming and erase in order to increase the data
security. Each block can be programmed and
erased over 100,000 cycles. V
the I/O pin down to 1.65V. An optional 12V V
power supply is provided to speed up the program
phase at customer production line environment.
An internal Command Interface (C.I.) decodes the
instructions to access/modify the memory content.
The Program/Erase Controller (P/E.C.) automati-
cally executes the algorithms taking care of the
timings necessary for program and erase opera-
tions. Verification is performed too, unburdening
the microcontroller, while the Status Register
tracks the status of the operation.
The following instructions are executed by the
M28W320C: Read Array, Read Electronic Signa-
ture, Read Status Register, Clear Status Register,
Program, Double Word Program, Block Erase,
Program/Erase Suspend, Program/Erase Re-
sume, CFI Query, Block Protect, Block Lock, Block
Unprotect, Protection Program.
Organisation
The M28W320C is organised as 2 Mbit by 16 bits.
A0-A20 are the address lines; DQ0-DQ15 are the
V
2. Depends on range.
Symbol
DD
T
T
V
cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions
above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating condi-
tions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant qual-
ity documents.
V
, V
BIAS
T
STG
PP
IO
A
DDQ
When shipped, all
Ambient Operating Temperature
Temperature Under Bias
Storage Temperature
Input or Output Voltage
Supply Voltage
Program Voltage
DDQ
allows to drive
bits of the
Parameter
(1)
(2)
PP
Data Input/Output. Memory control is provided by
Chip Enable E, Output Enable G and Write Enable
W inputs. The Program and Erase operations are
managed automatically by the P/E.C. Block pro-
tection against Program or Erase provides addi-
tional data security.
Memory Blocks
The device features an asymmetrical blocked ar-
chitecture. The M28W320C has an array of 71
blocks: 8 Parameter Blocks of 4 KWord and 63
Main Blocks of 32 KWord. M28W320CT has the
Parameter Blocks at the top of the memory ad-
dress space while the M28W320CB locates the
Parameter Blocks starting from the bottom. The
memory maps are shown in Tables 3 and 4.
All Blocks are protected at power up. Instruction
are provided to protect, unprotect any block in the
application. A second register locks the protection
status while WP is low (see Block Protection De-
scription). Each block can be erased separately.
Erase can be suspended in order to perform either
read or program in any other block and then re-
sumed. Program can be suspended to read data in
any other block and then resumed.
The architecture includes a 128 bits Protection
register that are divided into Two 64-bits segment.
In the first one, starting from address 81h to 84h,
is written a unique device number, while the sec-
ond one, starting from 85h to 88h, is programma-
ble by the user. The user programmable segment
can be permanently protected programming the
bit.1 of the Protection Lock Register (see protec-
tion register and Security Block). The parameter
block (# 0) is a security block. It can be permanent-
ly protected by the user programming the bit.2 of
the Protection Lock Register (see protection regis-
ter and Security Block).
M28W320CT, M28W320CB
–0.6 to V
–40 to 125
–55 to 155
–0.6 to 4.1
–0.6 to 13
–40 to 85
Value
DDQ
+0.6
Unit
V
V
V
C
C
C
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