M36DR432A Datasheet, PDF (14/46 Pages) STMicroelectronics – 32 Mbit 2Mb x16, Dual Bank, Page Flash Memory and 4 Mbit 256K x16 SRAM, Multiple Memory Product

M36DR432A, M36DR432B
Table 14. Protection States ⁽¹⁾
Current State ^{(2) Program/Erase}
(WP, DQ1, DQ0)
Allowed
Protect
Next State After Event ⁽³⁾
Unprotect
Lock
WP transition
100
yes
101
100
111
000
101
no
101
100
111
001
110
yes
111
110
111
011
111
no
111
110
111
011
000
yes
001
000
011
100
001
no
001
000
011
101
011
no
011
011
011
111 or 110 ⁽⁴⁾
Note: 1. All blocks are protected at power-up, so the default configuration is 001 or 101 according to WPF status.
2. Current state and Next state gives the protection status of a block. The protection status is defined by the write protect pin and by
DQ1 (= 1 for a locked block) and DQ0 (= 1 for a protected block) as read in the Autoselect instruction with A1 = VIH and A0 = VIL.
3. Next state is the protection status of a block after a Protect or Unprotect or Lock command has been issued or after WPF has
changed its logic value.
4. A WPF transition to V_IH on a locked block will restore the previous DQ0 value, giving a 111 or 110.
Table 15. Instructions ^(1,2)
Mne.
Instr.
Cyc.
RD ⁽⁴⁾
Read/Reset
Memory Array
Addr. ⁽³⁾
1+
Data
Addr.
3+
Data
RCFI CFI Query
Addr.
1+
Data
AS ⁽⁴⁾ Auto Select
Addr.
3+
Data
CR
Configuration
Register Write
PG Program
DPG
Double Word
Program
EBY
Enter Bypass
Mode
Addr.
4
Data
Addr.
4
Data
Addr.
5
Data
Addr.
3
Data
1st Cyc. 2nd Cyc. 3rd Cyc. 4th Cyc. 5th Cyc. 6th Cyc.
X
Read Memory Array until a new write cycle is initiated.
F0h
555h
AAh
2AAh
55h
555h
F0h
Read Memory Array until a new
write cycle is initiated.
55h
Read CFI data until a new write cycle is initiated.
98h
555h
AAh
2AAh
55h
555h
90h
Read electronic Signature or
Block Protection or Configuration
Register Status until a new cycle
is initiated.
555h
2AAh
555h
Configura-
tion Data
AAh
55h
60h
03h
555h
AAh
2AAh
55h
555h
A0h
Program
Address
Program
Data
Read Data Polling or
Toggle Bit until
Program completes.
555h
AAh
2AAh
55h
555h
40h
Program Program
Address 1 Address 2
Program Program
Data 1 Data 2
Note 6, 7
555h
2AAh
555h
AAh
55h
20h
14/46