SRI4K-A3T/1GE STMicroelectronics, SRI4K-A3T/1GE Datasheet - Page 11

• Manufacturer Part Number: SRI4K-A3T/1GE
• Manufacturer: STMicroelectronics

Specifications of SRI4K-A3T/1GE

• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Compliant

32-bit Binary Counters
The two 32-bit binary counters located at block ad-
dresses 5 and 6, respectively, are used to count
down from 2
dedicated logic that only allows the update of a
counter if the new value is lower than the previous
one. This feature allows the application to count
down by steps of 1 or more. The initial value in
Counter 5 is FFFFFFFEh and is FFFFFFFFh in
Counter
00000000h, the counter is empty and cannot be
reloaded. The counter is updated by issuing the
Figure 17. Binary Counter (addresses 5 to 6)
Figure 18. Count Down Example (Binary Format)
The counter with block address 6 controls the Re-
load command used to reset the resettable OTP
area (addresses 0 to 4). Bits b
11-bit Reload counter; whenever one of these 11
bits is updated, the SRI4K detects the change and
adds an Erase cycle to the WRITE_BLOCK com-
Initial data
1-unit decrement
1-unit decrement
1-unit decrement
8-unit decrement
Increment not allowed
6.
32
Block
Address
When
(4096 million) to 0. The SRI4K uses
5
6
the
MSb
b31
value
b31
31
1
1
1
1
1
1
to b
b24 b23
displayed
...
...
...
...
...
...
21
act as an
1
1
1
1
1
1
32-bit Binary Counter
32-bit Binary Counter
1
1
1
1
1
1
32-bit Block
is
b16 b15
1
1
1
1
1
1
1
1
1
1
1
1
WRITE_BLOCK command to block address 5 or
6, depending on which counter is to be updated.
The WRITE_BLOCK command writes the new 32-
bit value to the counter block address.
shows examples of how the counters operate.
The counter programming cycles are protected by
automated anti-tearing logic. This function allows
the counter value to be protected in case of power
down within the programming cycle. In case of
power down, the counter value is not updated and
the previous value continues to be stored.
mand for locations 0 to 4 (see the
Area” paragraph). The Erase cycle remains active
until a POWER-OFF or a SELECT command is is-
sued. The SRI4K’s resettable OTP area can be re-
loaded up to 2,047 times (2
1
1
1
1
1
1
1
1
1
1
1
1
b8 b7
1
1
1
1
1
1
1
1
1
1
1
1
LSb
1
1
1
1
1
1
b0
1
1
1
1
0
1
11
Description
Count down
-1).
1
1
1
1
1
0
Counter
“Resettable OTP
1
1
0
0
0
0
1
0
1
0
0
0
b0
Figure 18.
ai07661
ai07660
SRI4K
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