MBM29F040C datasheet(12/41 Pages) SPANSION

12 / 41 page

MBM29F040C-55/-70/-90

To verify programming of the protection circuitry, the programming equipment must force VID on address pin A9

with CE and OE at VIL and WE at VIH. Scanning the sector addresses (A16, A17 and A18) while (A6, A1, A0) = (0,

1, 0) will produce a logical “1” code at device output DQ0 for a protected sector. Otherwise the device will read

00H for unprotected sector. In this mode, the lower order addresses, except for A0, A1 and A6 are DON’T CARES.

Address locations with A1 = VIL are reserved for Autoselect manufacturer and device codes.

It is also possible to determine if a sector is protected in the system by writing an Autoselect command. Performing

a read operation at the address location XX02H, where the higher order addresses (A16, A17 and A18) are the

sector address will produce a logical “1” at DQ0 for a protected sector. See Table 3 for Autoselect codes.

Notes: 1. Address bits A11 to A18 = X = “H” or “L” for all address commands except for Program Address (PA) and

Sector Address (SA).

2. Bus operations are defined in Table 2.

3. RA = Address of the memory location to be read.

PA = Address of the memory location to be programmed. Addresses are latched on the falling edge of the

WE pulse.

SA = Address of the sector to be erased. The combination of A18, A17, and A16 will uniquely select any

sector.

4. RD = Data read from location RA during read operation.

PD = Data to be programmed at location PA. Data is latched on the falling edge of WE.

*: Either of the two reset commands will reset the device.

Command Definitions

Device operations are selected by writing specific address and data sequences into the command register.

Writing incorrect address and data values or writing them in the improper sequence will reset the device to read

mode. Table 5 defines the valid register command sequences. Note that the Erase Suspend (B0H) and Erase

Resume (30H) commands are valid only while the Sector Erase operation is in progress. Moreover, both Read/

Reset Commands are functionally equivalent, resetting the device to the read mode.

Table 5

MBM29F040C Command Definitions

Command

Sequence

Read/Reset

Bus

Write

Cycles

Req'd

First Bus

Write Cycle

Second Bus

Write Cycle

Third Bus

Write Cycle

Fourth Bus

Read/Write

Cycle

Fifth Bus

Write Cycle

Sixth Bus

Write Cycle

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Read/Reset*

XXXH F0H

——————————

Read/Reset*

555H

AAH

2AAH

55H

555H

F0H

————

Autoselect

555H

AAH

2AAH

55H

555H

90H

——————

Byte Program

555H

AAH

2AAH

55H

555H

A0H

————

Chip Erase

555H

AAH

2AAH

55H

555H

80H

555H

AAH

2AAH

55H

555H

10H

Sector Erase

555H

AAH

2AAH

55H

555H

80H

555H

AAH

2AAH

55H

30H

Sector Erase Suspend

Erase can be suspended during sector erase with Addr (“H” or “L”). Data (B0H)

Sector Erase Resume

Erase can be resumed after suspend with Addr (“H” or “L”). Data (30H)

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