BS640HD9V datasheet(47/89 Pages) AMD

Part #	BS640HD9V

Description	128 or 64 Megabit (8 M or 4 M x 16-Bit) CMOS 1.8 Volt-only Simultaneous Read/Write, Burst Mode Flash Memory

PDF	89 Pages

Scroll/Zoom	100%

Manufacturer	AMD [Advanced Micro Devices]

Direct Link	http://www.amd.com

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47 / 89 page

May 10, 2006 27024B3

Am29BDS128H/Am29BDS640H

D A TA

SH EE T

DYB Write Command

The DYB Write command is used for setting the DYB,

which is a volatile bit that is cleared at hardware reset.

There is one DYB per sector. If the PPB is set, the sec-

tor is protected regardless of the value of the DYB. If

the PPB is cleared, setting the DYB to a 1 protects the

sector from programs or erases. Since this is a volatile

bit, removing power or resetting the device will clear

the DYBs. Writing Read/Reset command returns the

device to normal operations.

PPB Status Command

The programming of the PPB for a given sector can be

verified by writing a PPB status verify command to the

device. Writing Read/Reset command and SecSi Sec-

tor Exit command return the device to normal opera-

tion.

PPB Lock Bit Status Command

The programming of the PPB Lock Bit for a given sec-

tor can be verified by writing a PPB Lock Bit status ver-

ify command to the device. Read/Reset and SecSi

Sector Exit return the device to normal operation.

DYB Status Command

The programming of the DYB for a given sector can be

verified by writing a DYB Status command to the de-

vice. Writing SecSi Sector Exit command returns the

device to normal operation.

BS640HD9V Datasheet(PDF) 47 Page - Advanced Micro Devices