M50FW040K5(2006) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M50FW040K5
(Rev.:2006)

4-Mbit (512 Kb x8, uniform block) 3-V supply firmware hub Flash memory

STMicroelectronics 

Firmware hub (FWH) interface Configuration Registers

M50FW040

6.7

Device Code Register

Reading the Device Code Register returns the device code for the memory, 2Ch. This

register is read-only and writing to it has no effect.

Table 9. Firmware hub Configuration Register map

Mnemonic

Register Name

Memory

Address

Default

Value

Access

T_BLOCK_LK Top Block Lock Register (Block 7)

FBF0002h 01h

T_MINUS01_LK Top Block [-1] Lock Register (Block 6)

FBE0002h 01h

T_MINUS02_LK Top Block [-2] Lock Register (Block 5)

FBD0002h 01h

T_MINUS03_LK Top Block [-3] Lock Register (Block 4)

FBC0002h 01h

T_MINUS04_LK Top Block [-4] Lock Register (Block 3)

FBB0002h 01h

T_MINUS05_LK Top Block [-5] Lock Register (Block 2)

FBA0002h 01h

T_MINUS06_LK Top Block [-6] Lock Register (Block 1)

FB90002h 01h

T_MINUS07_LK Top Block [-7] Lock Register (Block 0)

FB80002h 01h

FGPI_REG

Firmware Hub (FWH) General Purpose Input

Register

FBC0100h

N/A

MANUF_REG Manufacturer Code Register

FBC0000h 20h

DEV_REG Device Code Register

FBC0001h 2Ch

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R

R

R

Table 10. Lock Register bit definitions(1)

Bit Bit name Value

Function

7-3

2

Read-

Lock

1

Lock-

Down

0

Write-

Lock

Reserved

‘1’ Bus Read operations in this Block always return 00h.

‘0’

Bus read operations in this Block return the Memory Array contents.

(Default value).

Changes to the Read-Lock bit and the Write-Lock bit cannot be

‘1’

performed. Once a ‘1’ is written to the Lock-Down bit it cannot be cleared

to ‘0’; the bit is always reset to ‘0’ following a Reset (using RP or INIT) or

after power-up.

‘0’

Read-Lock and Write-Lock can be changed by writing new values to

them. (Default value).

‘1’

Program and Erase operations in this Block will set an error in the Status

Register. The memory contents will not be changed. (Default value).

‘0’

Program and Erase operations in this Block are executed and will modify

the Block contents.

1. Applies to Top Block Lock Register (T_BLOCK_LK) and Top Block [-1] Lock Register (T_MINUS01_LK) to

Top Block [-7] Lock Register (T_MINUS07_LK).

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