MBM29F040C Ver la hoja de datos (PDF) - Spansion Inc.

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componentes Descripción

Fabricante

MBM29F040C

FLASH MEMORY CMOS 4M (512K × 8) BIT

Spansion Inc. 

MBM29F040C-55/-70/-90

Type

Manufacture’s

Code

Table 3 MBM29F040C Sector Protection Verify Autoselect Codes

A18 A17 A16 A6

A1

A0

Code

(HEX)

DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

X X X VIL VIL VIL 04H 0 0 0 0 0 1 0 0

Device Code

X X X VIL VIL VIH A4H 1 0 1 0 0 1 0 0

Sector

Protection

Sector

Addresses

VIL VIH VIL 01H* 0 0 0 0 0 0 0 1

* : Outputs 01H at protected sector addresses and 00H at unprotected sector addresses.

Sector Address

SA0

SA1

SA2

SA3

SA4

SA5

SA6

SA7

Table 4 Sector Address Tables

A18

A17

A16

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

Address Range

00000H to 0FFFFH

10000H to 1FFFFH

20000H to 2FFFFH

30000H to 3FFFFH

40000H to 4FFFFH

50000H to 5FFFFH

60000H to 6FFFFH

70000H to 7FFFFH

Write

Device erasure and programming are accomplished via the command register. The contents of the register serve

as inputs to the internal state machine. The state machine outputs dictate the function of the device.

The command register itself does not occupy any addressable memory location. The register is a latch used to

store the commands, along with the address and data information needed to execute the command. The

command register is written by bringing WE to VIL, while CE is at VIL and OE is at VIH. Addresses are latched on

the falling edge of WE or CE, whichever happens later; while data is latched on the rising edge of WE or CE,

whichever happens first. Standard microprocessor write timings are used.

Refer to AC Write Characteristics and the Erase/Programming Waveforms for specific timing parameters.

Sector Protection

The MBM29F040C features hardware sector protection. This feature will disable both program and erase

operations in any number of sectors (0 through 8). The sector protection feature is enabled using programming

equipment at the user’s site. The device is shipped with all sectors unprotected.

To activate this mode, the programming equipment must force VID on address pin A9 and control pin OE, (suggest

VID = 11.5 V) and CE = VIH. The sector addresses (A18, A17 and A16) should be set to the sector to be protected.

Table 4 defines the sector address for each of the eight (8) individual sectors. Programming of the protection

circuitry begins on the falling edge of the WE pulse and is terminated with the rising edge of the same. Sector

addresses must be held constant during the WE pulse. See figures 11 and 17 sector protection waveforms and

algorithm.

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