Sanyo DVD1451U Service Manual page 24

to an internal state-machine which controls the erase and programming circuitry. Write cycles also internally latch
addresses and data needed for the programming and erase operations. Reading data out of the device is similar
to reading from 5.0 V and 12.0 V Flash or EPROM devices.
The MBM29LV160TE/BE is programmed by executing the program command sequence. This will invoke the
Embedded Program * Algorithm which is an internal algorithm that automatically times the program pulse widths
TM
and verifies proper cell margins. Typically, each sector can be programmed and verified in about 0.5 seconds.
Erase is accomplished by executing the erase command sequence. This will invoke the Embedded Erase *
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Algorithm which is an internal algorithm that automatically preprograms the array if it is not already programmed
before executing the erase operation. During erase, the device automatically times the erase pulse widths and
verifies proper cell margins. (Continued)
(Continued)
Any individual sector is typically erased and verified in 1.0 second (if already preprogrammed).
The device also features sector erase architecture. The sector mode allows each sector to be erased and
reprogrammed without affecting other sectors. The MBM29LV160TE/BE is erased when shipped from the factory.
The device features single 3.0 V power supply operation for both read and write functions. Internally generated
and regulated voltages are provided for the program and erase operations. A low V detector automatically
CC
inhibits write operations on the loss of power. The end of program or erase is detected by Data Polling of DQ ,
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by the Toggle Bit feature on DQ , or the RY/BY output pin. Once the end of a program or erase cycle has been
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completed, the device internally resets to the read mode.
The MBM29LV160TE/BE also has a hardware RESET pin. When this pin is driven low, execution of any
Embedded
Program Algorithm or Embedded Erase Algorithm is terminated. The internal state machine is then
reset to the read mode. The RESET pin may be tied to the system reset circuitry. Therefore, if a system reset
occurs during the Embedded Program Algorithm or Embedded Erase Algorithm, the device is automatically
reset to the read mode and will have erroneous data stored in the address locations being programmed or
erased. These locations need re-writing after the Reset. Resetting the device enables the system's microprocessor
to read the boot-up firmware from the Flash memory.
Fujitsu's Flash technology combines years of Flash memory manufacturing experience to produce the highest
levels of quality, reliability, and cost effectiveness. The MBM29LV160TE/BE memory electrically erases all bits
within a sector simultaneously via Fowler-Nordhiem tunneling. The bytes/words are programmed one byte/word
at a time using the EPROM programming mechanism of hot electron injection.
*:
Embedded Erase and Embedded Program are trademarks of Advanced Micro Devices, Inc.
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