Rainbow Electronics AT27BV4096 - Manual (Page 9)

AT27BV4096
9
Rapid Programming Algorithm
A 50
µ
s CE pulse width is used to program. The address is
set to the first location. V
CC
is raised to 6.5V and V
PP
is
raised to 13.0V. Each address is first programmed with one
50
µ
s CE pulse without verification. Then a verification /
reprogramming loop is executed for each address. In the
event a word fails to pass verification, up to 10 successive
50
µ
s pulses are applied with a verification after each
pulse. If the word fails to verify after 10 pulses have been
applied, the part is considered failed. After the word verifies
properly, the next address is selected until all have been
checked. V
PP
is then lowered to 5.0V and V
CC
to 5.0V. All
words are read again and compared with the original data
to determine if the device passes or fails.
START
ADDR = FIRST LOCATION
ADDR = FIRST LOCATION
VCC = 6.5V
VPP = 13.0V
VCC = 5.0V
VPP = 5.0V
PROGRAM ONE 50 µS PULSE
PROGRAM ONE 50 µS PULSE
LAST
ADDR.?
LAST
ADDR.?
NO
NO
NO
X = 0
X = 10?
INCREMENT X
VERIFY
WORD
DEVICE
FAILED
DEVICE
PASSED
COMPARE
ALL WORDS
TO ORIGINAL
DATA
YES
YES
YES
INCREMENT ADDRESS
INCREMENT ADDRESS
PASS
PASS
FAIL
FAIL