S29WS064N0LBAI011 datasheet(55/99 Pages) SPANSION

Part #	S29WS064N0LBAI011

Description	256/128/64 MEGABIT CMOS 1.8 VOLT ONLY SIMULTANEOUS READ/WRITE BURST MODE FLASH MEMORY

PDF	99 Pages

Scroll/Zoom	100%

Manufacturer	SPANSION [SPANSION]

Direct Link	http://www.spansion.com

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55 / 99 page

January 25, 2005 S29WS-N_00_G0

Ad vance

Information

Figure 8.2. PPB Program/Erase Algorithm

8.3

Dynamic Protection Bits

Dynamic Protection Bits are volatile and unique for each sector and can be individually modified.

DYBs only control the protection scheme for unprotected sectors that have their PPBs cleared

(erased to “1”). By issuing the DYB Set or Clear command sequences, the DYBs are set (pro-

grammed to “0”) or cleared (erased to “1”), thus placing each sector in the protected or

unprotected state respectively. This feature allows software to easily protect sectors against in-

advertent changes yet does not prevent the easy removal of protection when changes are

needed.

Read Byte Twice

Addr = SA0

Enter PPB

Command Set.

Addr = BA

Program PPB Bit.

Addr = SA

DQ5 = 1?

Yes

DQ6 =

Toggle?

DQ6 =

Toggle?

Read Byte.

Addr = SA

PASS

FAIL

Issue Reset

Command

Exit PPB

Command Set

DQ0 =

'1' (Erase)

'0' (Pgm.)?

Read Byte Twice

Addr = SA0

Wait 500 µs

S29WS064N0LBAI011 Datasheet(PDF) 55 Page - SPANSION