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EN29F002AB-70JCP Datasheet(PDF) 8 Page - Eon Silicon Solution Inc. |
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EN29F002AB-70JCP Datasheet(HTML) 8 Page - Eon Silicon Solution Inc. |
8 / 35 page This Data Sheet may be revised by subsequent versions ©2003 Eon Silicon Solution, Inc., www.essi.com.tw or modifications due to changes in technical specifications. 8 EN29F002A / EN29F002AN Rev. A, Issue Date: 2003/03/26 Table 5. EN29F002A Command Definitions Command Sequence Read/Reset Write Cycles Req’d 1 st Write Cycle 2 nd Write Cycle 3 rd Write Cycle 4 th Write Cycle 5 th Write Cycle 6 th Write Cycle Addr Data Addr Data Addr Data Addr Data Addr Data Addr Data Read/Reset 1 XXXh F0h RA RD Read/Reset 4 555h AAh AAAh 55h 555h F0h RA RD AutoSelect Manufacturer ID 4 555h AAh AAAh 55h 555h 90h 000h/ 100h 7Fh/ 1Ch AutoSelect Device ID (Top Boot) 4 555h AAh AAAh 55h 555h 90h 001h/ 101h 7Fh/ 92h AutoSelect Device ID (Bottom Boot) 4 555h AAh AAAh 55h 555h 90h 001h/ 101h 7Fh/ 97h AutoSelect Sector Protect Verify 4 555h AAh AAAh 55h 555h 90h SA & 02h 00h/ 01h Byte Program 4 555h AAh AAAh 55h 555h A0h PA PD Chip Erase 6 555h AAh AAAh 55h 555h 80h 555h AAh AAAh 55h 555h 10h Sector Erase 6 555h AAh AAAh 55h 555h 80h 555h AAh AAAh 55h SA 30h Sector Erase Suspend 1 xxxh B0h Sector Erase Resume 1 xxxh 30h Notes: 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 SA = Sector Address: address of the sector to be erased. Address bits A17-A13 uniquely select any sector. The data is 00h for an unprotected sector and 01h for a protected sector. Byte Programming Command Programming the EN29F002A is performed on a byte-by-byte basis using a four bus-cycle operation (two unlock write cycles followed by the Program Setup command and Program Data Write cycle). When the program command is executed, no additional CPU controls or timings are necessary. The program operation is terminated automatically by an internal timer. Address is latched on the falling edge of CE or WE , whichever is last; data is latched on the rising edge of CE or WE , whichever is first. The program operation is completed when EN29F002A returns the equivalent data to the programmed location. Programming status may be checked by sampling data on DQ7 (DATA polling) or on DQ6 (toggle bit). Changing data from 0 to 1 requires an erase operation. When programming time limit is exceeded, DQ5 will produce a logical “1” and a Reset command can return the device to Read mode. EN29F002A ignores commands written during Byte Programming. If a hardware RESET occurs during Byte Programming, data at the programmed location may get corrupted. Programming is allowed in any sequence and across any sector boundary. Chip Erase Command An auto Chip Erase algorithm is employed when the Chip Erase command sequence is performed. Although the Chip Erase command requires six bus cycles: two unlock write cycles, a setup command, two additional unlock write cycles and the chip erase command, the user does not need |
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