BS640HD9V datasheet(45/89 Pages) AMD

45 / 89 page

May 10, 2006 27024B3

Am29BDS128H/Am29BDS640H

D A TA

SH EE T

PPB Program Command

The PPB Program command is used to program, or

set, a given PPB. Each PPB is individually pro-

grammed (but is bulk erased with the other PPBs).

The specific sector address (Amax–A12) are written at

the same time as the program command 60h. If the

PPB Lock Bit is set and the correspondingly PPB is

set for the sector, the PPB Program command will not

execute and the command will time out without pro-

gramming the PPB. After issuing “SBA+WP/68h” at

the fourth bus cycle, the device requires a time out pe-

riod of approximately 150 µs to program the PPB.

Writing “SBA+WP/48” at the fifth bus cycle produces

verify data at DQ0. If DQ0 = 1, the PPB is pro-

grammed. If not, the system must repeat this program

sequence from the fourth cycle of “SBA+WP/68h”.

The PPB Program command does not follow the

Embedded Program algorithm. Writing the SecSi

Sector Exit command or Read/Reset command return

the device back to normal operation.

All PPB Erase Command

The All PPB Erase command is used to erase all

PPBs in bulk. There is no means for individually eras-

ing a specific PPB. Unlike the PPB program, no spe-

cific sector address is required. However, when the

PPB erase command is written (60h), all Sector PPBs

are erased in parallel. If the PPB Lock Bit is set, the

ALL PPB Erase command will not execute and the

command will time-out without erasing the PPBs. After

issuing “WP/60h” at the fourth bus cycle, the device re-

quires a time out period of approximately 1.5 ms to

erase the PPB. Writing “SBA+WP/40h” at the fifth bus

cycle produces verify data at DQ0. If DQ0 = 0, the

PPB is erased. If not, the system must repeat this pro-

gram sequence from the fourth cycle of “WP/60h”.

It is the responsibility of the system to preprogram all

PPBs prior to issuing the All PPB Erase command. If

the system attempts to erase a cleared PPB, over-era-

sure may occur, making it difficult to program the PPB

at a later time. Also note that the total number of PPB

program/erase cycles is limited to 100 cycles. Cycling

the PPBs beyond 100 cycles is not guaranteed.

Writing the SecSi Sector Exit command or Read/Re-

set command return the device to normal operation.

BS640HD9V 数据表(PDF) 45 Page - Advanced Micro Devices

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