S75WS256NDFBAWMB datasheet(57/216 Pages) SPANSION

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February 17, 2005 S75WS-N-00_A0

S75WS256Nxx Based MCPs

Advance

Information

Figure 9.2 PPB Program/Erase Algorithm

9.3

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 inadvertent

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

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