UPI-C42/UPI-L42
290414 – 14
Figure 6. Quick-Pulse Programming Algorithm
Quick-Pulse Programming Algorithm
As previously stated, the UPI-C42 will be pro-
grammed using the Quick-Pulse Programming Algo-
rithm, developed by Intel to substantially reduce the
thorughput time in production programming.
The Quick-Pulse Programming Algorithm uses initial
pulses of 100
m
s followed by a byte verification to
determine when the address byte has been suc-
cessfully programmed. Up to 25 100
m
s pulses per
byte are provided before a failure is recognized. A
flow chart of the Quick-Pulse Programming Algo-
rithm is shown in Figure 6.
The entire sequence of program pulses and byte
verifications is performed at V
CC
e
6.25V and
V
DD
e
12.75V. When programming has been com-
pleted, all bytes should be compared to the original
data with V
CC
e
V
DD
e
5V.
A verify should be performed on the programmed
bits to ensure that they have been correctly pro-
grammed. The verify is performed with T0
e
5V,
V
DD
e
5V, EA
e
12.75V, SS
Ý
e
5V, PROG
e
5V,
A0
e
0V, and CS
Ý
e
5V.
In addition to the Quick-Pulse Programming Algo-
rithm, the UPI-C42 OPT is also compatible with In-
tel’s Inteligent Programming Algorithm which is used
to program the NMOS UPI-42AH OTP devices.
The entire sequence of program pulses and byte
verifications is performed at V
CC
e
6.25V and
V
DD
e
12.75V. When the inteligent Programming
cycle has been completed, all bytes should be com-
pared to the original data with V
CC
e
5.0, V
DD
e
5V.
Verify
A verify should be performed on the programmed
bits to determine that they have been correctly pro-
grammed. The verify is performed with T0
e
5V,
V
DD
e
5V, EA
e
12.75V, SS
e
5V, PROG
e
5V,
A0
e
0V, and CS
e
5V.
SECURITY BIT
The security bit is a single EPROM cell outside the
EPROM array. The user can program this bit with the
appropriate access code and the normal program-
ming procedure, to inhibit any external access to the
EPROM contents. Thus the user’s resident program
is protected. There is no direct external access to
this bit. However, the security byte in the signature
row has the same address and can be used to
check indirectly whether the security bit has been
programmed or not. The security bit has no effect on
the signature mode, so the security byte can always
be examined.
SECURITY BIT PROGRAMMING/
VERIFICATION
Programming
a. Read the security byte of the signature mode.
Make sure it is 00H.
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