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29F004B-70 Datasheet(PDF) 9 Page - Macronix International |
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29F004B-70 Datasheet(HTML) 9 Page - Macronix International |
9 / 39 page 9 MX29F004T/B P/N:PM0554 REV. 1.9, OCT. 19, 2004 SECTOR ERASE COMMANDS The Automatic Sector Erase does not require the de- vice to be entirely pre-programmed prior to executing the Automatic Set-up Sector Erase command and Auto- matic Sector Erase command. Upon executing the Au- tomatic Sector Erase command, the device will auto- matically program and verify the sector(s) memory for an all-zero data pattern. The system is not required to provide any control or timing during these operations. When the sector(s) is automatically verified to contain an all-zero pattern, a self-timed sector erase and verify begin. The erase and verify operations are complete when the data on Q7 is "1" and the data on Q6 stops toggling for two consecutive read cycles, at which time the device returns to the Read mode. The system is not required to provide any control or timing during these operations. When using the Automatic Sector Erase algorithm, note that the erase automatically terminates when adequate erase margin has been achieved for the memory array (no erase verification command is required). Sector erase is a six-bus cycle operation. There are two "unlock" write cycles. These are followed by writing the set-up command 80H. Two more "unlock" write cycles are then followed by the sector erase command 30H. The sector address is latched on the falling edge of WE or CE, whichever happens later, while the command (data) is latched on the rising edge of WE or CE, whichever hap- pens first. Sector addresses selected are loaded into internal register on the sixth falling edge of WE or CE, whichever happens later. Each successive sector load cycle started by the falling edge of WE or CE, which- ever happens later must begin within 30us from the ris- ing edge of the preceding WE or CE, whichever hap- pens first. Otherwise, the loading period ends and inter- nal auto sector erase cycle starts. (Monitor Q3 to deter- mine if the sector erase timer window is still open, see section Q3, Sector Erase Timer.) Any command other than Sector Erase(30H) or Erase Suspend(B0H) during the time-out period resets the device to read mode. Status Q7 Q6 Q5 Q3 Q2 Note1 Note2 Byte Program in Auto Program Algorithm Q7 Toggle 0 N/A No Toggle Auto Erase Algorithm 0 Toggle 0 1 Toggle Erase Suspend Read 1 No 0 N/A Toggle In Progress (Erase Suspended Sector) Toggle Erase Suspended Mode Erase Suspend Read Data Data Data Data Data (Non-Erase Suspended Sector) Erase Suspend Program Q7 Toggle 0 N/A N/A Byte Program in Auto Program Algorithm Q7 Toggle 1 N/A No Toggle Exceeded Auto Erase Algorithm 0 Toggle 1 1 Toggle Time Limits Erase Suspend Program Q7 Toggle 1 N/A N/A TABLE 4. WRITE OPERATION STATUS Note: 1. Q7 and Q2 require a valid address when reading status information. Refer to the appropriate subsection for further details. 2. Q5 switches to '1' when an Auto Program or Auto Erase operation has exceeded the maximum timing limits. See "Q5:Exceeded Timing Limits " for more information. |
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