m29w400b-100za6tr STMicroelectronics, m29w400b-100za6tr Datasheet - Page 18

• Manufacturer Part Number: m29w400b-100za6tr
• Description: 64 Mbit 8mb X8 Or 4mb X16, Multiple Bank, Boot Block 3v Supply Flash Memory
• Manufacturer: STMicroelectronics

Bus operations
3.5
3.6
3.6.1
3.6.2
18/74
Automatic Standby
If CMOS levels (V
more the memory enters Automatic Standby where the internal Supply Current is reduced to
the Standby Supply Current, I
Read operation is in progress.
Special bus operations
Additional bus operations can be performed to read the Electronic Signature and also to
apply and remove Block Protection. These bus operations are intended for use by
programming equipment and are not usually used in applications. They require V
applied to some pins.
Electronic Signature
The memory has two codes, the manufacturer code and the device code, that can be read
to identify the memory. These codes can be read by applying the signals listed in
and
Block Protect and Chip Unprotect
Groups of blocks can be protected against accidental Program or Erase. The Protection
Groups are shown in
unprotected to allow the data inside the blocks to be changed.
The V
V
protected regardless of the Block Protection Status or the Reset/Block Temporary
Unprotect pin status.
Block Protect and Chip Unprotect operations are described in
PP
/Write Protect is at V
Table
PP
/Write Protect pin can be used to protect the four outermost boot blocks. When
5, Bus operations.
CC
± 0.2V) are used to drive the bus and the bus is inactive for 300ns or
Appendix
IL
the four outermost boot blocks are protected and remain
CC2
A,
. The Data Inputs/Outputs will still output data if a Bus
Table 24: Block addresses
The whole chip can be
Appendix
D.
M29DW640F
ID
Table 4
to be