W39V040FAT datasheet(6/36 Pages) WINBOND

Part #	W39V040FAT

Description	512K X 8 CMOS FLASH MEMORY WITH FWH INERFACE

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Manufacturer	WINBOND [Winbond]

Direct Link	http://www.winbond.com

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W39V040FA

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Block Locking Registers

This part provides 8 even 64Kbytes blocks, and each block can be locked by register control. These

control registers can be set or clear through memory address. Below is the detail description.

Block Locking Registers type and access memory map Table

REGISTERS

TYPE

CONTROL

BLOCK

DEVICE PHYSICAL

ADDRESS

4GBYTES SYSTEM

MEMORY ADDRESS

BLR7

R/W

7

7FFFFh – 70000h

FFBF0002h

BLR6

R/W

6

6FFFFh – 60000h

FFBE0002h

BLR5

R/W

5

5FFFFh – 50000h

FFBD0002h

BLR4

R/W

4

4FFFFh – 40000h

FFBC0002h

BLR3

R/W

3

3FFFFh – 30000h

FFBB0002h

BLR2

R/W

2

2FFFFh – 20000h

FFBA0002h

BLR1

R/W

1

1FFFFh – 10000h

FFB90002h

BLR0

R/W

0

0FFFFh – 00000h

FFB80002h

Block Locking Register Bits Function Table

BIT

FUNCTION

7 – 3

Reserved

2

Read Lock

1: Prohibit to read in the block where set

0: Normal read operation in the block where clear. This is default state.

1

Lock Down

1: Prohibit further to set or clear the Read Lock or Write Lock bits. This Lock Down

Bit can only be set not clear. Only the device is reset or re-powered, the Lock

Down Bit is cleared.

0: Normal operation for Read Lock or Write Lock. This is the default state.

0

Write Lock

1: Prohibited to write in the block where set. This is default state.

0: Normal programming/erase operation in the block where clear.

Register Based Block Locking Value Definitions Table

BIT [7:3]

BIT 2

BIT 1

BIT 0

RESULT

00000

0

Full Access.

00000

0

1

Write Lock. Default State.

00000

0

1

0

Locked Open (Full Access, Lock Down).

00000

0

1

Write Locked, Locked Down.

00000

1

0

Read Locked.

00000

1

0

1

Read & Write Locked.

00000

1

0

Read Locked, Locked Down.

00000

1

Read & Write Locked, Locked Down.

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