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JS28F256P33BFE 数据表(PDF) 33 Page - Micron Technology |
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JS28F256P33BFE 数据表(HTML) 33 Page - Micron Technology |
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33 / 90 page  Datasheet Aug 2009 33 Order Number:320003-08 P33-65nm 11.0 Status Register To read the Status Register, issue the Read Status Register command at any address. Status Register information is available to which the Read Status Register, Word Program, or Block Erase command was issued. SRD is automatically made available following a Word Program, Block Erase, or Block Lock command sequence. Reads from the device after any of these command sequences outputs the device’s status until another valid command is written (e.g. the Read Array command). The Status Register is read using single asynchronous-mode or synchronous burst mode reads. SRD is output on DQ[7:0], while 0x00 is output on DQ[15:8]. In asynchronous mode the falling edge of OE#, or CE# (whichever occurs first) updates and latches the Status Register contents. However, when reading the Status Register in synchronous burst mode, CE# or ADV# must be toggled to update SRD. The Device Write Status bit (SR.7) provides overall status of the device. SR[6:1] present status and error information about the program, erase, suspend, VPP, and block-locked operations. Notes: 1. Always clear the Status Register prior to resuming erase operations. It avoids Status Register ambiguity when issuing commands during Erase Suspend. If a command sequence error occurs during an erase-suspend state, the Status Register contains the command sequence error status (SR[7,5,4] set). When the erase operation resumes and finishes, possible errors during the erase operation cannot be detected via the Status Register because it contains the previous error status 2. BEFP mode is only valid in main array. Table 10: Status Register Description Status Register (SR) Default Value = 0x80 Device Write Status Erase Suspend Status Erase Status Program Status VPP Status Program Suspend Status Block-Locked Status BEFP Write Status DWS ESS ES PS VPPS PSS BLS BWS 7 654 32 10 Bit Name Description 7 Device Write Status (DWS) 0 = Device is busy; program or erase cycle in progress; SR.0 valid. 1 = Device is ready; SR[6:1] are valid. 6 Erase Suspend Status (ESS) 0 = Erase suspend not in effect. 1 = Erase suspend in effect. 5 Erase Status (ES) Command Sequence Error SR.5 SR.4 Description 4 Program Status (PS) 0 0 1 1 0 1 0 1 Program or Erase operation successful. Program error - operation aborted. Erase error - operation aborted. Command sequence error - command aborted. 3 VPP Status (VPPS) 0 = VPP within acceptable limits during program or erase operation. 1 = VPP < VPPLK during program or erase operation. 2 Program Suspend Status (PSS) 0 = Program suspend not in effect. 1 = Program suspend in effect. 1 Block-Locked Status (BLS) 0 = Block not locked during program or erase. 1 = Block locked during program or erase; operation aborted. 0BEFP Write Status (BWS) After Buffered Enhanced Factory Programming (BEFP) data is loaded into the buffer: 0 = BEFP complete. 1 = BEFP in-progress. |
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