MMC2107 - Freescale Semiconductor

Freescale Semiconductor, Inc.
Non-Volatile Memory FLASH (CMFR)
Functional Description
9.8.4.4 Program Pulse-Width and Amplitude Modulation
To prevent bits from possibly becoming depleted (over programmed),
the first programming pulses should be of reduced duration and with
reduced drain voltage. Refer to Table 9-9 for the required programming
steps to insure FLASH reliability.
NOTE:
The values of PAWS[2:0] and NVR should be updated on the
appropriate pulse to change the programming voltage and CLKPM
should be updated to adjust the pulse width.
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Freescale Semiconductor, I
9.8.4.5 Overprogramming
Table 9-9. Required Programming Algorithm
Voltage Step PAWS[2:0] NVR Pulse Width Number of Pulses
–2 V 1 0 0 1 250 µs 4
–3 V 1 0 1 1 250 µs 4
–4 V 1 1 0 1 250 µs 4
–5 V 1 1 1 1 250 µs 4
–6 V 1 0 0 0 50 µs 20
–7 V 1 0 1 0 50 µs 20
–8 V 1 1 0 0 50 µs 20
–9 V 1 1 1 0 50 µs 20
–9 V 1 1 1 0 100 µs Any additional
GDB = 1 for all programming operations.
Margin reads are required after every pulse.
Programming a bit without a program margin read after each program
pulse or exceeding the specified program times or voltages results in an
overprogrammed state. Once a bit is overprogrammed, data in the array
block that is located in the same column is lost as the overprogrammed
bit causes the entire column to appear programmed. To restore an array
block with an overprogrammed bit, the block must be erased and
reprogrammed.
MMC2107 – Rev. 2.0
Technical Data
MOTOROLA Non-Volatile Memory FLASH (CMFR) 213
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