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A49LF040ATX-33

4 Mbit CMOS 3.3Volt-only Low Pin Count Flash Memory

AMIC Technology 

A49LF040A

Table 9: Lock Register Bit Definition

Data

00h

01h

02h

03h

04h

05h

06h

07h

Reserved

Bit 7:3

00000

00000

00000

00000

00000

00000

00000

00000

Read-Lock

Bit 2

0

0

0

0

1

1

1

1

Lock-Down

Bit 1

0

0

1

1

0

0

1

1

Write-Lock

Bit 0

0

1

0

1

0

1

0

1

Function

Full Access.

Write locked. Default state at power-up.

Locked open (full access locked down).

Write-locked down.

Read locked.

Read and Write locked.

Read-locked down

Read- and Write-locked down

Data

7:3

2

1

0

Function

Reserved

Read-Lock

1 = Prevents read operations in the block where set

0 = Normal operation for reads in the block where clear. This is the default state.

Lock-Down

1 = Prevents further set or clear operations to the Write-Lock and Read-Lock bits. Lock-Down only can be set

but not clear. The block will remain lock-down until reset (with RST or INIT being Low), or until the device

is power-on reset.

0 = Normal operation for Write-Lock and Read-Lock bit altering in the block where clear. This is the default state.

Write-Lock

1 = Prevents program or erase operations in the block where set. This is the default state.

0 = Normal operation for programming and erase in the block where clear.

PRELIMINARY (March, 2006, Version 0.1)

11

AMIC Technology, Corp.

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