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EN29F08070S Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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EN29F08070S Datasheet(HTML) 9 Page - List of Unclassifed Manufacturers |
9 / 37 page 4800 Great America Parkway, Suite 202 Tel: 408-235-8680 Santa Clara, CA 95054 Fax: 408-235-8685 9 EN29F080 Rev. C, Issue Date: 2001/07/05 COMMAND DEFINITIONS The operations of the EN29F080 are selected by one or more commands written into the command register to perform Read/Reset Memory, Read ID, Read Sector Protection, Program, Sector Erase, Chip Erase, Erase Suspend and Erase Resume. Commands are made up of data sequences written at specific addresses via the command register. The sequences for the specified operation are defined in the Command Definitions table (Table 5). Incorrect addresses, incorrect data values or improper sequences will reset the device to Read Mode. Table 5. EN29F080 Command Definitions 1 st Write Cycle 2 nd Write Cycle 3 rd Write Cycle 4 th Write Cycle 5 th Write Cycle 6 th Write Cycle Command Sequence Read/Reset Cycles Addr Data Addr Data Addr Data Addr Data Addr Data Addr Data Reset 1 XXXh F0h Read 4 RA RD AutoSelect Manufacturer ID 4 555h AAh 2AAh 55h 555h 90h X100h 1c AutoSelect Device ID 4 555h AAh 2AAh 55h 555h 90h X101h 08 AutoSelect Sector Protect Verify 4 555h AAh 2AAh 55h 555h 90h BA & 02h 00h/ 01h Byte Program 4 555h AAh 2AAh 55h 555h A0h PA PD Chip Erase 6 555h AAh 2AAh 55h 555h 80h 555h AAh 2AAh 55h 555h 10h Sector Erase 6 555h AAh 2AAh 55h 555h 80h 555h AAh 2AAh 55h BA 30h Sector Erase Suspend 1 xxxh B0h Sector Erase Resume 1 xxxh 30h RA = Read Address: address of the memory location to be read. This one is a read cycle. RD = Read Data: data read from location RA during Read operation. This one is a read cycle. PA = Program Address: address of the memory location to be programmed PD = Program Data: data to be programmed at location PA BA = Sector Address: address of the Sector to be erased or verified. Address bits A17-A13 uniquely select any Sector. Reading Array Data The device is automatically set to reading array data after power up. No commands are required to retrieve data. The device is also ready to read array data after completing an Embedded Program or Embedded Erase algorithm. Following an Erase Suspend command, Erase Suspend mode is entered. The system can read array data using the standard read timings, with the only difference in that if it reads at an address within erase suspended sectors, the device outputs status data. After completing a programming operation in the Erase Suspend mode, the system may once again read array data with the same exception. The Reset command must be issued to re-enable the device for reading array data if DQ5 goes high, or while in the autoselect mode. See next section for details on Reset. Reset Command Writing the reset command to the device resets the device to reading array data. Address bits are don’t- care for this command. The reset command may be written between the sequence cycles in an erase command sequence before erasing begins. This resets the device to reading array data. Once erasure begins, however, the device ignores reset commands until the operation is complete. The reset command may be written between the sequence cycles in a program command sequence before programming begins. This resets the device to reading array data (also applies to programming in Erase Suspend mode). Once programming begins, however, the device ignores reset commands until the operation is complete. |
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