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Electrically Erasable Programmable Read-Only Memory (E2PROM)
1
Electrically Erasable Programmable Read-Only Memory (E
2
PROM)
The gain and offset coefficients calculated in the
Calibration Mode
can be stored in the
E
2
PROM. The board is shipped with factory determined coefficients. When the user
initiates a calibration, newly calculated coefficients are stored in the DSP for use in
real-time correction. The new coefficients are not automatically stored in the E
2
PROM.
The bit in the BCR allows the user control over writing the results to the E
2
PROM,
which writes over any coefficients that were present. The DSP uses the range code in
each channel’s CSR to determined where the coefficients is written. This allows the
user to run new correction coefficients (from the DSP) but not corrupt coefficients
stored in the E
2
PROM. Most commercially available E
2
PROM’s have a guaranteed
100,000 write cycles lifetime. An EEPROM Writes Register (EWR) is available to the
user indicating how many writes have occurred. If this number becomes close to the
100,000 limit, it is suggested the E
2
PROM be replaced so data is not lost or corrupted.
Writing coefficients to the E
2
PROM once a day would not reach the limit of 100,000
write cycles for over twenty five years.
CAUTION:
An inadvertent write to this bit will result in the coefficients currently in
the DSP to be written to the E
2
PROM. Previously stored coefficients will be written
over.
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