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S71WS512NE0BFWZZ Datasheet(PDF) 65 Page - SPANSION |
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S71WS512NE0BFWZZ Datasheet(HTML) 65 Page - SPANSION |
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65 / 142 page  June 28, 2004 S71WS512NE0BFWZZ_00_A1 S29WSxxxN MirrorBit™ Flash Family For Multi-chip Products (MCP) 65 Ad vance Info rmat i o n Volatile Sector Protection Command Set The Volatile Sector Protection Command Set permits the user to set the Dynamic Protection Bit (DYB), clear the Dynamic Protection Bit (DYB), and read the logic state of the Dynamic Protection Bit (DYB). The Volatile Sector Protection Command Set Entry command sequence must be issued prior to any of the following commands to enable proper com- mand execution. DYB Set Command DYB Clear Command DYB Status Read Command Note that issuing the Volatile Sector Protection Command Set Entry com- mand disables reads and writes for the bank selected with the command. Reads within that bank, will return the DYB status for that sector. Writes within that bank, will set the DYB for that sector. Reads for other banks excluding that bank are allowed, writes are not allowed. All Reads must be performed using the Asyn- chronous mode. The DYB Set/Clear command is used to set or clear a DYB for a given sector. The high order address bits (A23–A14 for the WS256N) are issued at the same time as the code 00h or 01h on DQ7-DQ0. All other DQ data bus pins are ignored dur- ing the data write cycle. The DYBs are modifiable at any time, regardless of the state of the PPB or PPB Lock Bit. The DYBs are cleared at power-up or hardware reset. The programming state of the DYB for a given sector can be verified by writing a DYB Status Read Command to the device. The Volatile Sector Protection Command Set Exit command must be issued after the execution of the commands listed previously to reset the device to read mode. Note that issuing the Volatile Sector Protection Command Set Exit command re-enables reads and writes for Bank 0. SecSi Sector Entry Command The SecSi Sector Entry Command allows the following commands to be executed Read from SecSi Sector Program to SecSi Sector Sector 0 is remapped from memory array to SecSi Sector array. Reads can be performed using the Asynchronous or Synchronous mode. Burst mode reads within SecSi Sector will wrap from address FFh back to address 00h. Reads out- side of sector 0 will return memory array data. Continuous burst read past the maximum address is undefined. Simultaneous operations are allowed except for Bank 0. Once the SecSi Sector Entry Command is issued, the SecSi Sector Exit command has to be issued to exit SecSi Sector Mode. |
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