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M28R400CT, M28R400CB

Note: Cmd = Command, Elect.Sg. = Electronic Signature, Ers = Erase, Prog. = Program, Prot = Protection, Sus = Suspend.

Table 31. Write State Machine Current/Next, sheet 2 of 2.

Block Erase

Sus Read

CFI

“1”

CFI

Erase Sus

Read Array

Program

Setup

Erase Sus

Read Array

Erase

(continue)

Erase Sus

Read Array

Erase

(continue)

Erase Sus

Read Sts

Erase Sus

Read Array

Block Erase

(complete)

“1”

Status

Read Array

Program

Setup

Erase

Setup

Read Array

Read

Status

Read Array

Chip Erase

Setup

“1”

Status

Chip Erase Command Error

Chip Erase

(continue)

Chip Erase Command Error

Chip Erase

Cmd.Error

“1”

Status

Read Array

Program

Setup

Erase

Setup

Read Array

Read

Status

Read Array

Chip Erase

(continue)

“0”

Status

Erase (continue)

Chip Erase

(complete)

“1”

Status

Read Array

Program

Setup

Erase

Setup

Read Array

Read

Status

Read Array

Current State

Command Input (and Next State)

Read

Elect.Sg.

(90h)

Read CFI

Query

(98h)

Lock Setup

(60h)

Prot. Prog.

Setup (C0h)

Lock

Confirm

(01h)

Lock Down

Confirm

(2Fh)

Unlock

Confirm

(D0h)

Chip Erase

Set Up

(80h)

Read Array

Read

Elect.Sg.

Read CFI

Query

Lock Setup

Prot. Prog.

Setup

Read Array

Chip Erase

Set Up

Read Status

Read

Elect.Sg.

Read CFI

Query

Lock Setup

Prot. Prog.

Setup

Read Array

Chip Erase

Set Up

Read Elect.Sg.

Read

Elect.Sg.

Read CFI

Query

Lock Setup

Prot. Prog.

Setup

Read Array

Chip Erase

Set Up

Read CFI Query

Read

Elect.Sg.

Read CFI

Query

Lock Setup

Prot. Prog.

Setup

Read Array

Chip Erase

Set Up

Lock Setup

Lock Command Error

Lock (complete)

Lock

Command

Error

Lock Cmd Error

Read

Elect.Sg.

Read CFI

Query

Lock Setup

Prot. Prog.

Setup

Read Array

Chip Erase

Set Up

Lock (complete)

Read

Elect.Sg.

Read CFI

Query

Lock Setup

Prot. Prog.

Setup

Read Array

Chip Erase

Set Up

Prot. Prog.

Setup

Protection Register Program

Prot. Prog.

(continue)

Protection Register Program (continue)

Prot. Prog.

(complete)

Read

Elect.Sg.

Read CFI

Query

Lock Setup

Prot. Prog.

Setup

Read Array

Chip Erase

Set Up

Prog. Setup

Program

Program

(continue)

Program (continue)

Prog. Suspend

Read Status

Prog.

Suspend

Read

Elect.Sg.

Prog.

Suspend

Read CFI

Query

Program Suspend Read Array

Program

(continue)

Program

Suspend

Read Array

Prog. Suspend

Read Array

Prog.

Suspend

Read

Elect.Sg.

Prog.

Suspend

Read CFI

Query

Program Suspend Read Array

Program

(continue)

Program

Suspend

Read Array

Current

State

SR

bit 7

Data

When

Read

Command Input (and Next State)

Read

Array

(FFh)

Program

Setup

(10/40h)

Block

Erase

Setup

(20h)

Erase

Confirm

(D0h)

Prog/Ers

Suspend

(B0h)

Prog/Ers

Resume

(D0h)

Read

Status

(70h)

Clear

Status

(50h)