28F002BC Ver la hoja de datos (PDF) - Intel
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28F002BC Datasheet PDF : 37 Pages
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28F002BC 2-MBIT BOOT BLOCK FLASH MEMORY
E
APPENDIX B
WSM TRANSITION TABLE
Write State Machine Current/Next States
Command Input (and Next State)
Current SR.7
State
Data
When
Read
Read
Array
(FFH)
Program
Setup
(40H)
Erase Erase
Setup Confirm
(20H) (D0H)
Erase
Susp.
(B0H)
Erase Read
Resume Status
(D0H) (70H)
Clear
Status
(50H)
Read
ID
(90H)
Read
Array
Read Program Erase
“1”
Array Array Setup Setup
Read Array
Read Read
Status Array Read ID
Program
Setup
“1”
Status
Program (Command Input = Byte Program Data)
Program*
(Not
“0”
Comp.)
Status
Program
Program
Read Program Erase
(Comp.)
“1”
Status Array Setup Setup
Read Array
Read Read
Status Array Read ID
Erase
Setup
“1”
Status
Erase Command Error
Erase
Erase
Cmd.
Error
Erase
Erase Command Error
Erase
Cmd.
Error
Read Program Erase
“1” Status Array Setup Setup
Read Array
Read Read
Status Array Read ID
Erase
(Not
“0”
Status
Comp.)
Erase
Erase
Susp. to
Status
Erase
Erase
Read Program Erase
(Comp.)
“1”
Status Array Setup Setup
Read Array
Read Read
Status Array Read ID
Erase
Erase Erase Erase
Erase
Erase Erase Erase
Suspend “1”
Status Susp. to Susp. to Susp. to Erase Susp. to Erase Susp. to Susp. to Susp. to
to Status
Array Array Array
Array
Status Array Array
Erase
Suspend “1”
to Array
Array
Erase Erase Erase
Susp. to Susp. to Susp. to
Array Array Array
Erase
Erase
Susp. to
Array
Erase
Erase Erase Erase
Susp. to Susp. to Susp. to
Status Array Array
Read
Status
Read Program Erase
“1”
Status Array Setup Setup
Read Array
Read Read
Status Array Read ID
Read
Identifier “1”
Read Program Erase
ID
Array Setup Setup
Read Array
Read Read
Status Array Read ID
NOTE:
You cannot program “1”s to the flash. Writing FFH after the Program Setup command will initiate the program algorithm of the
WSM machine. The WSM will attempt the program, realize you are trying to program “1”s, and exit to read status mode without
changing memory contents. No error is returned. Writing another FFH while in read status mode will return the flash to Read
Array.
36
PRELIMINARY
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