29C256 DATASHEET PDF

To allow for simple in-system reprogrammability, the AT29C does not require high input voltages for programming. Five-volt-only commands determine the operation of the device. Reading data out of the device is similar to reading from a static RAM. Reprogramming the AT29C is performed on a page basis; 64 bytes of data are loaded into the device and then simultaneously programmed.

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To allow for simple in-system reprogrammability, the AT29C does not require high input voltages for programming. Five-volt-only commands determine the operation of the device. Reading data out of the device is similar to reading from a static RAM. Reprogramming the AT29C is performed on a page basis; 64 bytes of data are loaded into the device and then simultaneously programmed.

The contents of the entire device may be erased by using a six-byte software code although erasure before pro- gramming is not needed. During a reprogram cycle, the address locations and 64 bytes of data are internally latched, freeing the address and data bus for other operations. Following the initiation of a program cycle, the device will automatically erase the page and then program the latched data using an internal control timer.

Once the end of a program cycle has been detected a new access for a read, program or chip erase can begin. When CE and OE are low and WE is high, the data stored at the memory location determined by the address pins is asserted on the outputs. The outputs are put in the high impedance state whenever CE or OE is high. This dual-line control gives designers flexibility in preventing bus contention. The address is latched on the falling edge of CE or WE, whichever occurs last. The data is latched by the first rising edge of CE or WE.

Byte loads are used to enter the 64 bytes of a page to be programmed or the software codes for data protection and chip erasure.

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29C256 DATASHEET PDF

There are still a few parallel flash chips available in DIP, e. The bios works, buy the at still refuses to employ 1. Naw, that would be hokey. The 29C should work without any socket mods.

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