BRIGHT
Microelectronics
Inc.
BM29F400T/BM29F400B
Logical Inhibit
IL
IH
IH
OE
OE
CE
WE
= V , or = V . To initiate a write cycle
Writing is inhibited by holding any one of
= V ,
CE
WE
must be a logical "0" while
and
is a logical "1".
Power-up Write Inhibit
IL
IH
WE
CE
OE
= V and
Power-up of the device with
=
= V will not accept commands on the rising
WE
RESET
edge of
. The internal state machine is automatically
to the Read mode on power-up.
Sector Unprotect
The BM29F400 also features a sector unprotect mode, so that protected sectors may be unprotected
to incorporate any changes in the code. Protecting all sectors is necessary before unprotecting any
sector(s). Sector unprotection is accomplished in a PROM programmer.
START
Write Program Command Sequence
(see below)
Data Polling Device
NO
Last Address
?
Increment Address
YES
Programming Completed
Program Command Sequence (Address/Command)
5555H/AAH
2AAAH/55H
5555H/A0H
Program Address/ Program Data
Figure 1. Internal Programming Algorithm
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