M29W640FT datasheet(16/71 Pages) NUMONYX

Part #	M29W640FT

Description	64 Mbit (8Mb x8 or 4Mb x16, Page, Boot Block) 3V Supply Flash Memory

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Manufacturer	NUMONYX [Numonyx B.V]

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Bus operations

M29W640FT, M29W640FB

16/71

3.5

Automatic Standby

If CMOS levels (VCC ± 0.2V) are used to drive the bus and the bus is inactive for 300ns or

more the memory enters Automatic Standby where the internal Supply Current is reduced to

the Standby Supply Current, ICC2. The Data Inputs/Outputs will still output data if a Bus

Read operation is in progress.

3.6

Special Bus operations

Additional bus operations can be performed to read the Electronic Signature and also to

apply and remove Block Protection. These bus operations are intended for use by

programming equipment and are not usually used in applications. They require VID to be

applied to some pins.

3.6.1

Electronic Signature

The memory has two codes, the manufacturer code and the device code, that can be read

to identify the memory. These codes can be read by applying the signals listed in Table 4:

Bus operations, BYTE = VIL and Table 5: Bus operations, BYTE = VIH.

3.6.2

Block Protect and Chip Unprotect

Groups of blocks can be protected against accidental Program or Erase. The Protection

Groups are shown in Appendix A: Block addresses Table 21 and Table 22. The whole chip

can be unprotected to allow the data inside the blocks to be changed.

The VPP/Write Protect pin can be used to protect the two outermost boot blocks. When

VPP/Write Protect is at VIL the two outermost boot blocks are protected and remain

protected regardless of the Block Protection Status or the Reset/Block Temporary

Unprotect pin status.

Block Protect and Chip Unprotect operations are described in Appendix D: Block protection.

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