M50FW080 datasheet(34/56 Pages) STMICROELECTRONICS

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Firmware Hub (FWH) interface Configuration Registers

M50FW080

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6.3

Manufacturer Code Register

Reading the Manufacturer Code Register returns the manufacturer code for the memory.

The manufacturer code for STMicroelectronics is 20h. This register is read-only and writing

to it has no effect.

6.4

Device Code Register

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

Table 12.

Lock Register bit definitions(1)

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

Top Block [-15] Lock Register (T_MINUS15_LK).

Bit

Bit name

Value

Function

7-3

Reserved

Read-Lock

‘1’

Bus Read operations in this Block always return 00h.

‘0’

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

(Default value).

Lock-Down

‘1’

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

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).

0Write-Lock

‘1’

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

will modify the Block contents.

Table 13.

General-Purpose Input Register definition(1)

Applies to the General Purpose Input Register (FGPI_REG).

Bit

Bit Name

Value

Function

7-5

Reserved

FGPI4

‘1’

Input Pin FGPI4 is at VIH

‘0’

Input Pin FGPI4 is at VIL

FGPI3

‘1’

Input Pin FGPI3 is at VIH

‘0’

Input Pin FGPI3 is at VIL

FGPI2

‘1’

Input Pin FGPI2 is at VIH

‘0’

Input Pin FGPI2 is at VIL

FGPI1

‘1’

Input Pin FGPI1 is at VIH

‘0’

Input Pin FGPI1 is at VIL

FGPI0

‘1’

Input Pin FGPI0 is at VIH

‘0’

Input Pin FGPI0 is at VIL

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