Page 1 Page 2 megabit 2. The dual-interface allows a dedicated serial interface to be connected to a DSP and a dedicated 8-bit interface to be connected to a microcontroller or vice versa. However, the use of either interface is purely optional. Its 69,, bits of memory are organized as 8, pages of 1, bytes binary page size or 1, bytes standard DataFlash page size each. The buffers allow receiving of data while a page in the main Memory is being reprogrammed, as well as writing a continuous data stream.
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Faerr The device operates from a single power supply, 2. Therefore not possible to only program the first two bytes of the register and then pro- gram the remaining 62 bytes at a later time.
Main Memory Page Read Opcode: Since the entire memory array erased, no address bytes need to be clocked into the device, and any data clocked in after the opcode will datashdet ignored To perform a buffer to main memory page program with built-in erase for the PUW Changed t from max To allow for simple in-system reprogrammability, the AT45DBD does not require high input voltages for programming.
Being able to reprogram the Sector Protection Register with the sector protection enabled allows the user to temporarily disable the sector protection to an individual sector rather than dis- abling sector protection completely.
The algorithm will be repeated sequentially for each page within the entire array. Main Memory Page to Buffer 1 or 2 Transfer 6. The first 13 bits Zt45dbd — PA0 of the bit address sequence specify which page of the main memory array to read, and the last 11 bits BA10 — BA0 of the datasjeet address sequence specify the starting byte address within the page. Unless otherwise specified tolerance: The information in this document is provided in connection with Atmel products.
The Block Erase function is not affected by the Chip Erase issue. The DataFlash is designed to The entire main memory can be erased at one time by using the Chip Erase command.
Other algorithms can be used to rewrite portions of the Flash array. The algorithm above shows the programming of a single page. Elcodis is a trademark at45ebd Elcodis Company Ltd. Page 35 Table All other trademarks are the property of their respective owners. Page 37 Output Test Load Please contact Atmel for the estimated availability of devices with the fix.
Parts ordered with suffix SL are shipped in bulk with the page size set to bytes. Memory Array To provide optimal flexibility, the at45dbd array of the AT45DBD is divided into three levels of granularity comprising of sectors, blocks, and pages.
Fixed tim- ing is not recommended. The Sector Protection Register can be reprogrammed while the sector protection enabled or dis- abled.
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Main Memory Page Program Through Buffer Sector Protection: Along with all above read and write operations there are few other commands for sector protection. Sector Protection Register is used in order to specify the sectors, which is to be protected or unprotected. There are also three more commands available to program, read, erase Sector Protection Register. Sector protection can be achieved in two ways either by software or by hardware. Once WP is asserted, the sectors specified by Sector Protection Register will be protected against any program or erase operation. In case if any program or erase operation command is issued while WP pin is asserted, the corresponding command will be ignored by the device and it will return to IDLE state once the CS pin is deasserted. Sector Lockdown: The device comes with another feature called sector lockdown mechanism.
The dual-interface allows a dedicated serial interface to be connected to a DSP and a dedicated 8-bit interface to be connected to a microcontroller or vice versa. However, the use of either interface is purely optional. Its 69,, bits of memory are organized as 8, pages of 1, bytes binary page size or 1, bytes standard DataFlash page size each. The buffers allow receiving of data while a page in the main Memory is being reprogrammed, as well as writing a continuous data stream. EEPROM emulation bit or byte alterability is easily handled with a self-contained three step read-modifywrite operation. Unlike conventional Flash memories that are accessed randomly with multiple address lines and a parallel interface, the DataFlash uses either a RapidS serial interface or a 8-bit Rapid8 interface to sequentially access its data. The simple sequential access dramatically reduces active pin count, facilitates hardware layout, increases system reliability, minimizes switching noise, and reduces package size.