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S71WS512NC0BAWE22 데이터시트(PDF) 48 Page - SPANSION |
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S71WS512NC0BAWE22 데이터시트(HTML) 48 Page - SPANSION |
48 / 188 page 46 S71WS-Nx0 Based MCPs S71WS-N_01_A4 September 15, 2005 Ad van c e Inf o rmation /* Example: Unlock Bypass Entry Command */ *( (UINT16 *)bank_addr + 0x555 ) = 0x00AA; /* write unlock cycle 1 */ *( (UINT16 *)bank_addr + 0x2AA ) = 0x0055; /* write unlock cycle 2 */ *( (UINT16 *)bank_addr + 0x555 ) = 0x0020; /* write unlock bypass command */ /* At this point, programming only takes two write cycles. */ /* Once you enter Unlock Bypass Mode, do a series of like */ /* operations (programming or sector erase) and then exit */ /* Unlock Bypass Mode before beginning a different type of */ /* operations. */ /* Example: Unlock Bypass Program Command */ /* Do while in Unlock Bypass Entry Mode! */ *( (UINT16 *)bank_addr + 0x555 ) = 0x00A0; /* write program setup command */ *( (UINT16 *)pa ) = data; /* write data to be programmed */ /* Poll until done or error. */ /* If done and more to program, */ /* do above two cycles again. */ /* Example: Unlock Bypass Exit Command */ *( (UINT16 *)base_addr + 0x000 ) = 0x0090; *( (UINT16 *)base_addr + 0x000 ) = 0x0000; 10.5.9 Write Operation Status The device provides several bits to determine the status of a program or erase operation. The following subsections describe the function of DQ1, DQ2, DQ3, DQ5, DQ6, and DQ7. DQ7: Data# Polling. The Data# Polling bit, DQ7, indicates to the host system whether an Em- bedded Program or Erase algorithm is in progress or completed, or whether a bank is in Erase Suspend. Data# Polling is valid after the rising edge of the final WE# pulse in the command se- quence. Note that the Data# Polling is valid only for the last word being programmed in the write- buffer-page during Write Buffer Programming. Reading Data# Polling status on any word other than the last word to be programmed in the write-buffer-page returns false status information. During the Embedded Program algorithm, the device outputs on DQ7 the complement of the datum programmed to DQ7. This DQ7 status also applies to programming during Erase Suspend. When the Embedded Program algorithm is complete, the device outputs the datum programmed to DQ7. The system must provide the program address to read valid status information on DQ7. If a program address falls within a protected sector, Data# polling on DQ7 is active for approxi- mately tPSP, then that bank returns to the read mode. During the Embedded Erase Algorithm, Data# polling produces a “0” on DQ7. When the Embed- ded Erase algorithm is complete, or if the bank enters the Erase Suspend mode, Data# Polling produces a “1” on DQ7. The system must provide an address within any of the sectors selected for erasure to read valid status information on DQ7. After an erase command sequence is written, if all sectors selected for erasing are protected, Data# Polling on DQ7 is active for approximately tASP, then the bank returns to the read mode. If not all selected sectors are protected, the Embedded Erase algorithm erases the unprotected sectors, and ignores the selected sectors that are protected. However, if the system reads DQ7 at an address within a protected sector, the status may not be valid. Cycle Description Operation Byte Address Word Address Data 1 Program Setup Command Write Base + xxxh Base +xxxh 00A0h 2 Program Command Write Program Address Program Address Program Data Cycle Description Operation Byte Address Word Address Data 1 Reset Cycle 1 Write Base + xxxh Base +xxxh 0090h 2 Reset Cycle 2 Write Base + xxxh Base +xxxh 0000h |
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